module Sequel::Model::Associations::ClassMethods
Each kind of association adds a number of instance methods to the model class which are specialized according to the association type and optional parameters given in the definition. Example:
class Project < Sequel::Model many_to_one :portfolio # or: one_to_one :portfolio one_to_many :milestones # or: many_to_many :milestones end
The project class now has the following instance methods:
- portfolio
-
Returns the associated portfolio.
- portfolio=(obj)
-
Sets the associated portfolio to the object, but the change is not persisted until you save the record (for #many_to_one associations).
- portfolio_dataset
-
Returns a dataset that would return the associated portfolio, only useful in fairly specific circumstances.
- milestones
-
Returns an array of associated milestones
- add_milestone(obj)
-
Associates the passed milestone with this object.
- remove_milestone(obj)
-
Removes the association with the passed milestone.
- remove_all_milestones
-
Removes associations with all associated milestones.
- milestones_dataset
-
Returns a dataset that would return the associated milestones, allowing for further filtering/limiting/etc.
If you want to override the behavior of the add_/remove_/remove_all_/ methods or the association setter method, use the :adder, :remover, :clearer, and/or :setter options. These options override the default behavior.
By default the classes for the associations are inferred from the association name, so for example the Project#portfolio will return an instance of Portfolio, and Project#milestones will return an array of Milestone instances. You can use the :class option to change which class is used.
Association definitions are also reflected by the class, e.g.:
Project.associations => [:portfolio, :milestones] Project.association_reflection(:portfolio) => {:type => :many_to_one, :name => :portfolio, ...}
Associations should not have the same names as any of the columns in the model's current table they reference. If you are dealing with an existing schema that has a column named status, you can't name the association status, you'd have to name it foo_status or something else. If you give an association the same name as a column, you will probably end up with an association that doesn't work, or a SystemStackError.
For a more in depth general overview, as well as a reference guide, see the Association Basics guide. For examples of advanced usage, see the Advanced Associations guide.
Attributes
All association reflections defined for this model (default: {}).
Hash with column symbol keys and arrays of #many_to_one association symbols that should be cleared when the column value changes.
Whether association metadata should be cached in the association reflection. If not cached, it will be computed on demand. In general you only want to set this to false when using code reloading. When using code reloading, setting this will make sure that if an associated class is removed or modified, this class will not hang on to the previous class.
The default options to use for all associations.
The default :eager_limit_strategy option to use for limited or offset associations (default: true, causing Sequel to use what it considers the most appropriate strategy).
Public Instance Methods
Array of all association reflections for this model class
# File lib/sequel/model/associations.rb, line 1539 def all_association_reflections association_reflections.values end
Associates a related model with the current model. The following types are supported:
- :many_to_one
-
Foreign key in current model's table points to associated model's primary key. Each associated model object can be associated with more than one current model objects. Each current model object can be associated with only one associated model object.
- :one_to_many
-
Foreign key in associated model's table points to this model's primary key. Each current model object can be associated with more than one associated model objects. Each associated model object can be associated with only one current model object.
- :one_through_one
-
Similar to #many_to_many in terms of foreign keys, but only one object is associated to the current object through the association. Provides only getter methods, no setter or modification methods.
- :one_to_one
-
Similar to #one_to_many in terms of foreign keys, but only one object is associated to the current object through the association. The methods created are similar to #many_to_one, except that the #one_to_one setter method saves the passed object.
- :many_to_many
-
A join table is used that has a foreign key that points to this model's primary key and a foreign key that points to the associated model's primary key. Each current model object can be associated with many associated model objects, and each associated model object can be associated with many current model objects.
The following options can be supplied:
Multiple Types¶ ↑
- :adder
-
Proc used to define the private add* method for doing the database work to associate the given object to the current object (*_to_many assocations).
- :after_add
-
Symbol, Proc, or array of both/either specifying a callback to call after a new item is added to the association.
- :after_load
-
Symbol, Proc, or array of both/either specifying a callback to call after the associated record(s) have been retrieved from the database.
- :after_remove
-
Symbol, Proc, or array of both/either specifying a callback to call after an item is removed from the association.
- :after_set
-
Symbol, Proc, or array of both/either specifying a callback to call after an item is set using the association setter method.
- :allow_eager
-
If set to false, you cannot load the association eagerly via eager or eager_graph
- :before_add
-
Symbol, Proc, or array of both/either specifying a callback to call before a new item is added to the association.
- :before_remove
-
Symbol, Proc, or array of both/either specifying a callback to call before an item is removed from the association.
- :before_set
-
Symbol, Proc, or array of both/either specifying a callback to call before an item is set using the association setter method.
- :cartesian_product_number
-
the number of joins completed by this association that could cause more than one row for each row in the current table (default: 0 for #many_to_one, #one_to_one, and #one_through_one associations, 1 for #one_to_many and #many_to_many associations).
- :class
-
The associated class or its name as a string or symbol. If not given, uses the association's name, which is camelized (and singularized unless the type is :many_to_one, :one_to_one, or #one_through_one). If this is specified as a string or symbol, you must specify the full class name (e.g. “::SomeModule::MyModel”).
- :class_namespace
-
If :class is given as a string or symbol, sets the default namespace in which to look for the class.
:class=>'Foo', :class_namespace=>'Bar'
looks for::Bar::Foo
.) - :clearer
-
Proc used to define the private remove_all* method for doing the database work to remove all objects associated to the current object (*_to_many assocations).
- :clone
-
Merge the current options and block into the options and block used in defining the given association. Can be used to DRY up a bunch of similar associations that all share the same options such as :class and :key, while changing the order and block used.
- :conditions
-
The conditions to use to filter the association, can be any argument passed to where. This option is not respected when using eager_graph or association_join, unless it is hash or array of two element arrays. Consider also specifying the :graph_block option if the value for this option is not a hash or array of two element arrays and you plan to use this association in eager_graph or association_join.
- :dataset
-
A proc that is instance_execed to get the base dataset to use (before the other options are applied). If the proc accepts an argument, it is passed the related association reflection.
- :distinct
-
Use the DISTINCT clause when selecting associating object, both when lazy loading and eager loading via .eager (but not when using .eager_graph).
- :eager
-
The associations to eagerly load via
eager
when loading the associated object(s). - :eager_block
-
If given, use the block instead of the default block when eagerly loading. To not use a block when eager loading (when one is used normally), set to nil.
- :eager_graph
-
The associations to eagerly load via
eager_graph
when loading the associated object(s). #many_to_many associations with this option cannot be eagerly loaded viaeager
. - :eager_grapher
-
A proc to use to implement eager loading via
eager_graph
, overriding the default. Takes an options hash with at least the entries :self (the receiver of the eager_graph call), :table_alias (the alias to use for table to graph into the association), and :implicit_qualifier (the alias that was used for the current table). Should return a copy of the dataset with the association graphed into it. - :eager_limit_strategy
-
Determines the strategy used for enforcing limits and offsets when eager loading associations via the
eager
method. - :eager_loader
-
A proc to use to implement eager loading, overriding the default. Takes a single hash argument, with at least the keys: :rows, which is an array of current model instances, :associations, which is a hash of dependent associations, :self, which is the dataset doing the eager loading, :eager_block, which is a dynamic callback that should be called with the dataset, and :id_map, which is a mapping of key values to arrays of current model instances. In the proc, the associated records should be queried from the database and the associations cache for each record should be populated.
- :eager_loader_key
-
A symbol for the key column to use to populate the key_hash for the eager loader. Can be set to nil to not populate the key_hash.
- :extend
-
A module or array of modules to extend the dataset with.
- :filter_limit_strategy
-
Determines the strategy used for enforcing limits and offsets when filtering by limited associations. Possible options are :window_function, :distinct_on, or :correlated_subquery depending on association type and database type.
- :graph_alias_base
-
The base name to use for the table alias when eager graphing. Defaults to the name of the association. If the alias name has already been used in the query, Sequel will create a unique alias by appending a numeric suffix (e.g. alias_0, alias_1, …) until the alias is unique.
- :graph_block
-
The block to pass to join_table when eagerly loading the association via
eager_graph
. - :graph_conditions
-
The additional conditions to use on the SQL join when eagerly loading the association via
eager_graph
. Should be a hash or an array of two element arrays. If not specified, the :conditions option is used if it is a hash or array of two element arrays. - :graph_join_type
-
The type of SQL join to use when eagerly loading the association via eager_graph. Defaults to :left_outer.
- :graph_only_conditions
-
The conditions to use on the SQL join when eagerly loading the association via
eager_graph
, instead of the default conditions specified by the foreign/primary keys. This option causes the :graph_conditions option to be ignored. - :graph_order
-
Over the order to use when using eager_graph, instead of the default order. This should be used in the case where :order contains an identifier qualified by the table's name, which may not match the alias used when eager graphing. By setting this to the unqualified identifier, it will be automatically qualified when using eager_graph.
- :graph_select
-
A column or array of columns to select from the associated table when eagerly loading the association via
eager_graph
. Defaults to all columns in the associated table. - :limit
-
Limit the number of records to the provided value. Use an array with two elements for the value to specify a limit (first element) and an offset (second element).
- :methods_module
-
The module that methods the association creates will be placed into. Defaults to the module containing the model's columns.
- :order
-
the column(s) by which to order the association dataset. Can be a singular column symbol or an array of column symbols.
- :order_eager_graph
-
Whether to add the association's order to the graphed dataset's order when graphing via
eager_graph
. Defaults to true, so set to false to disable. - :read_only
-
Do not add a setter method (for #many_to_one or #one_to_one associations), or add_/remove_/remove_all_ methods (for #one_to_many and #many_to_many associations). Always true for #one_through_one associations.
- :reciprocal
-
the symbol name of the reciprocal association, if it exists. By default, Sequel will try to determine it by looking at the associated model's assocations for a association that matches the current association's key(s). Set to nil to not use a reciprocal.
- :remover
-
Proc used to define the private remove* method for doing the database work to remove the association between the given object and the current object (*_to_many assocations).
- :select
-
the columns to select. Defaults to the associated class's table_name.* in an association that uses joins, which means it doesn't include the attributes from the join table. If you want to include the join table attributes, you can use this option, but beware that the join table attributes can clash with attributes from the model table, so you should alias any attributes that have the same name in both the join table and the associated table.
- :setter
-
Proc used to define the private _*= method for doing the work to setup the assocation between the given object and the current object (*_to_one associations).
- :subqueries_per_union
-
The number of subqueries to use in each UNION query, for eager loading limited associations using the default :union strategy.
- :validate
-
Set to false to not validate when implicitly saving any associated object.
:many_to_one¶ ↑
- :key
-
foreign key in current model's table that references associated model's primary key, as a symbol. Defaults to :“#{name}_id”. Can use an array of symbols for a composite key association.
- :key_column
-
Similar to, and usually identical to, :key, but :key refers to the model method to call, where :key_column refers to the underlying column. Should only be used if the model method differs from the foreign key column, in conjunction with defining a model alias method for the key column.
- :primary_key
-
column in the associated table that :key option references, as a symbol. Defaults to the primary key of the associated table. Can use an array of symbols for a composite key association.
- :primary_key_method
-
the method symbol or array of method symbols to call on the associated object to get the foreign key values. Defaults to :primary_key option.
- :qualify
-
Whether to use qualifier primary keys when loading the association. The default is true, so you must set to false to not qualify. Qualification rarely causes problems, but it's necessary to disable in some cases, such as when you are doing a JOIN USING operation on the column on Oracle.
:one_to_many and :one_to_one¶ ↑
- :key
-
foreign key in associated model's table that references current model's primary key, as a symbol. Defaults to :“#{self.name.underscore}_id”. Can use an array of symbols for a composite key association.
- :key_method
-
the method symbol or array of method symbols to call on the associated object to get the foreign key values. Defaults to :key option.
- :primary_key
-
column in the current table that :key option references, as a symbol. Defaults to primary key of the current table. Can use an array of symbols for a composite key association.
- :primary_key_column
-
Similar to, and usually identical to, :primary_key, but :primary_key refers to the model method call, where :primary_key_column refers to the underlying column. Should only be used if the model method differs from the primary key column, in conjunction with defining a model alias method for the primary key column.
- :raise_on_save_failure
-
Do not raise exceptions for hook or validation failures when saving associated objects in the add/remove methods (return nil instead) [one_to_many only].
:many_to_many and :one_through_one¶ ↑
- :graph_join_table_block
-
The block to pass to
join_table
for the join table when eagerly loading the association viaeager_graph
. - :graph_join_table_conditions
-
The additional conditions to use on the SQL join for the join table when eagerly loading the association via
eager_graph
. Should be a hash or an array of two element arrays. - :graph_join_table_join_type
-
The type of SQL join to use for the join table when eagerly loading the association via
eager_graph
. Defaults to the :graph_join_type option or :left_outer. - :graph_join_table_only_conditions
-
The conditions to use on the SQL join for the join table when eagerly loading the association via
eager_graph
, instead of the default conditions specified by the foreign/primary keys. This option causes the :graph_join_table_conditions option to be ignored. - :join_table
-
name of table that includes the foreign keys to both the current model and the associated model, as a symbol. Defaults to the name of current model and name of associated model, pluralized, underscored, sorted, and joined with '_'.
- :join_table_block
-
proc that can be used to modify the dataset used in the add/remove/remove_all methods. Should accept a dataset argument and return a modified dataset if present.
- :left_key
-
foreign key in join table that points to current model's primary key, as a symbol. Defaults to :“#{self.name.underscore}_id”. Can use an array of symbols for a composite key association.
- :left_primary_key
-
column in current table that :left_key points to, as a symbol. Defaults to primary key of current table. Can use an array of symbols for a composite key association.
- :left_primary_key_column
-
Similar to, and usually identical to, :left_primary_key, but :left_primary_key refers to the model method to call, where :left_primary_key_column refers to the underlying column. Should only be used if the model method differs from the left primary key column, in conjunction with defining a model alias method for the left primary key column.
- :right_key
-
foreign key in join table that points to associated model's primary key, as a symbol. Defaults to :“#{name.to_s.singularize}_id”. Can use an array of symbols for a composite key association.
- :right_primary_key
-
column in associated table that :right_key points to, as a symbol. Defaults to primary key of the associated table. Can use an array of symbols for a composite key association.
- :right_primary_key_method
-
the method symbol or array of method symbols to call on the associated object to get the foreign key values for the join table. Defaults to :right_primary_key option.
- :uniq
-
Adds a after_load callback that makes the array of objects unique.
# File lib/sequel/model/associations.rb, line 1761 def associate(type, name, opts = OPTS, &block) raise(Error, 'invalid association type') unless assoc_class = Sequel.synchronize{ASSOCIATION_TYPES[type]} raise(Error, 'Model.associate name argument must be a symbol') unless name.is_a?(Symbol) # dup early so we don't modify opts orig_opts = opts.dup if opts[:clone] cloned_assoc = association_reflection(opts[:clone]) orig_opts = cloned_assoc[:orig_opts].merge(orig_opts) end opts = default_association_options.merge(orig_opts).merge(:type => type, :name => name, :cache=>({} if cache_associations), :model => self) opts[:block] = block if block if !opts.has_key?(:instance_specific) && (block || orig_opts[:block] || orig_opts[:dataset]) # It's possible the association is instance specific, in that it depends on # values other than the foreign key value. This needs to be checked for # in certain places to disable optimizations. opts[:instance_specific] = true end opts = assoc_class.new.merge!(opts) if opts[:clone] && !opts.cloneable?(cloned_assoc) raise(Error, "cannot clone an association to an association of different type (association #{name} with type #{type} cloning #{opts[:clone]} with type #{cloned_assoc[:type]})") end opts[:eager_block] = opts[:block] unless opts.include?(:eager_block) if !opts.has_key?(:predicate_key) && opts.has_key?(:eager_loading_predicate_key) opts[:predicate_key] = opts[:eager_loading_predicate_key] end opts[:graph_join_type] ||= :left_outer opts[:order_eager_graph] = true unless opts.include?(:order_eager_graph) conds = opts[:conditions] opts[:graph_alias_base] ||= name opts[:graph_conditions] = conds if !opts.include?(:graph_conditions) and Sequel.condition_specifier?(conds) opts[:graph_conditions] = opts.fetch(:graph_conditions, []).to_a opts[:graph_select] = Array(opts[:graph_select]) if opts[:graph_select] [:before_add, :before_remove, :after_add, :after_remove, :after_load, :before_set, :after_set, :extend].each do |cb_type| opts[cb_type] = Array(opts[cb_type]) end late_binding_class_option(opts, opts.returns_array? ? singularize(name) : name) # Remove :class entry if it exists and is nil, to work with cached_fetch opts.delete(:class) unless opts[:class] send(:"def_#{type}", opts) def_association_instance_methods(opts) orig_opts.delete(:clone) opts[:orig_class] = orig_opts[:class] || orig_opts[:class_name] orig_opts.merge!(:class_name=>opts[:class_name], :class=>opts[:class], :block=>opts[:block]) opts[:orig_opts] = orig_opts # don't add to association_reflections until we are sure there are no errors association_reflections[name] = opts end
The association reflection hash for the association of the given name.
# File lib/sequel/model/associations.rb, line 1818 def association_reflection(name) association_reflections[name] end
Array of association name symbols
# File lib/sequel/model/associations.rb, line 1823 def associations association_reflections.keys end
Eager load the association with the given eager loader options.
# File lib/sequel/model/associations.rb, line 1828 def eager_load_results(opts, eo, &block) opts.eager_load_results(eo, &block) end
Finalize all associations such that values that are looked up dynamically in associated classes are set statically. As this modifies the associations, it must be done before calling freeze.
# File lib/sequel/model/associations.rb, line 1845 def finalize_associations @association_reflections.each_value(&:finalize) end
Freeze association related metadata when freezing model class.
# File lib/sequel/model/associations.rb, line 1833 def freeze @association_reflections.freeze.each_value(&:freeze) @autoreloading_associations.freeze.each_value(&:freeze) @default_association_options.freeze super end
Shortcut for adding a #many_to_many association, see associate
# File lib/sequel/model/associations.rb, line 1850 def many_to_many(name, opts=OPTS, &block) associate(:many_to_many, name, opts, &block) end
Shortcut for adding a #many_to_one association, see associate
# File lib/sequel/model/associations.rb, line 1855 def many_to_one(name, opts=OPTS, &block) associate(:many_to_one, name, opts, &block) end
Shortcut for adding a #one_through_one association, see associate.
# File lib/sequel/model/associations.rb, line 1860 def one_through_one(name, opts=OPTS, &block) associate(:one_through_one, name, opts, &block) end
Shortcut for adding a #one_to_many association, see associate
# File lib/sequel/model/associations.rb, line 1865 def one_to_many(name, opts=OPTS, &block) associate(:one_to_many, name, opts, &block) end
Shortcut for adding a #one_to_one association, see associate.
# File lib/sequel/model/associations.rb, line 1870 def one_to_one(name, opts=OPTS, &block) associate(:one_to_one, name, opts, &block) end
Private Instance Methods
The module to use for the association's methods. Defaults to the overridable_methods_module.
# File lib/sequel/model/associations.rb, line 1881 def association_module(opts=OPTS) opts.fetch(:methods_module, overridable_methods_module) end
Add a method to the module included in the class, so the method can be easily overridden in the class itself while allowing for super to be called.
# File lib/sequel/model/associations.rb, line 1888 def association_module_def(name, opts=OPTS, &block) association_module(opts).module_eval{define_method(name, &block)} end
Add a private method to the module included in the class.
# File lib/sequel/model/associations.rb, line 1893 def association_module_private_def(name, opts=OPTS, &block) association_module_def(name, opts, &block) association_module(opts).send(:private, name) end
Define all of the association instance methods for this association.
# File lib/sequel/model/associations.rb, line 1907 def def_association_instance_methods(opts) association_module_def(opts.dataset_method, opts){_dataset(opts)} def_association_method(opts) return if opts[:read_only] if opts[:setter] && opts[:_setter] # This is backwards due to backwards compatibility association_module_private_def(opts._setter_method, opts, &opts[:setter]) association_module_def(opts.setter_method, opts, &opts[:_setter]) end if adder = opts[:adder] association_module_private_def(opts._add_method, opts, &adder) association_module_def(opts.add_method, opts){|o,*args| add_associated_object(opts, o, *args)} end if remover = opts[:remover] association_module_private_def(opts._remove_method, opts, &remover) association_module_def(opts.remove_method, opts){|o,*args| remove_associated_object(opts, o, *args)} end if clearer = opts[:clearer] association_module_private_def(opts._remove_all_method, opts, &clearer) association_module_def(opts.remove_all_method, opts){|*args| remove_all_associated_objects(opts, *args)} end end
Adds the association method to the association methods module.
# File lib/sequel/model/associations.rb, line 1899 def def_association_method(opts) association_module_def(opts.association_method, opts) do |*dynamic_opts, &block| Sequel::Deprecation.deprecate("Passing multiple arguments to ##{opts.association_method}", "Additional arguments are currently ignored.") if dynamic_opts.length > 1 load_associated_objects(opts, dynamic_opts.length == 0 ? OPTS : dynamic_opts[0], &block) end end
Configures #many_to_many and #one_through_one association reflection and adds the related association methods
# File lib/sequel/model/associations.rb, line 1936 def def_many_to_many(opts) one_through_one = opts[:type] == :one_through_one left = (opts[:left_key] ||= opts.default_left_key) lcks = opts[:left_keys] = Array(left) right = (opts[:right_key] ||= opts.default_right_key) rcks = opts[:right_keys] = Array(right) left_pk = (opts[:left_primary_key] ||= self.primary_key) opts[:eager_loader_key] = left_pk unless opts.has_key?(:eager_loader_key) lcpks = opts[:left_primary_keys] = Array(left_pk) lpkc = opts[:left_primary_key_column] ||= left_pk lpkcs = opts[:left_primary_key_columns] ||= Array(lpkc) raise(Error, "mismatched number of left keys: #{lcks.inspect} vs #{lcpks.inspect}") unless lcks.length == lcpks.length if opts[:right_primary_key] rcpks = Array(opts[:right_primary_key]) raise(Error, "mismatched number of right keys: #{rcks.inspect} vs #{rcpks.inspect}") unless rcks.length == rcpks.length end opts[:uses_left_composite_keys] = lcks.length > 1 opts[:uses_right_composite_keys] = rcks.length > 1 opts[:cartesian_product_number] ||= one_through_one ? 0 : 1 join_table = (opts[:join_table] ||= opts.default_join_table) opts[:left_key_alias] ||= opts.default_associated_key_alias opts[:graph_join_table_join_type] ||= opts[:graph_join_type] opts[:after_load].unshift(:array_uniq!) if opts[:uniq] opts[:dataset] ||= opts.association_dataset_proc opts[:eager_loader] ||= opts.method(:default_eager_loader) join_type = opts[:graph_join_type] select = opts[:graph_select] use_only_conditions = opts.include?(:graph_only_conditions) only_conditions = opts[:graph_only_conditions] conditions = opts[:graph_conditions] graph_block = opts[:graph_block] graph_jt_conds = opts[:graph_join_table_conditions] = opts.fetch(:graph_join_table_conditions, []).to_a use_jt_only_conditions = opts.include?(:graph_join_table_only_conditions) jt_only_conditions = opts[:graph_join_table_only_conditions] jt_join_type = opts[:graph_join_table_join_type] jt_graph_block = opts[:graph_join_table_block] opts[:eager_grapher] ||= proc do |eo| ds = eo[:self] egls = eo[:limit_strategy] if egls && egls != :ruby associated_key_array = opts.associated_key_array orig_egds = egds = eager_graph_dataset(opts, eo) egds = egds. inner_join(join_table, rcks.zip(opts.right_primary_keys) + graph_jt_conds, :qualify=>:deep). select_all(egds.first_source). select_append(*associated_key_array) egds = opts.apply_eager_graph_limit_strategy(egls, egds) ds.graph(egds, associated_key_array.map(&:alias).zip(lpkcs) + conditions, :qualify=>:deep, :table_alias=>eo[:table_alias], :implicit_qualifier=>eo[:implicit_qualifier], :join_type=>eo[:join_type]||join_type, :from_self_alias=>eo[:from_self_alias], :join_only=>eo[:join_only], :select=>select||orig_egds.columns, &graph_block) else ds = ds.graph(join_table, use_jt_only_conditions ? jt_only_conditions : lcks.zip(lpkcs) + graph_jt_conds, :select=>false, :table_alias=>ds.unused_table_alias(join_table, [eo[:table_alias]]), :join_type=>eo[:join_type]||jt_join_type, :join_only=>eo[:join_only], :implicit_qualifier=>eo[:implicit_qualifier], :qualify=>:deep, :from_self_alias=>eo[:from_self_alias], &jt_graph_block) ds.graph(eager_graph_dataset(opts, eo), use_only_conditions ? only_conditions : opts.right_primary_keys.zip(rcks) + conditions, :select=>select, :table_alias=>eo[:table_alias], :qualify=>:deep, :join_type=>eo[:join_type]||join_type, :join_only=>eo[:join_only], &graph_block) end end return if opts[:read_only] if one_through_one opts[:setter] ||= proc do |o| h = {} lh = lcks.zip(lcpks.map{|k| get_column_value(k)}) jtds = _join_table_dataset(opts).where(lh) checked_transaction do current = jtds.first if o new_values = [] rcks.zip(opts.right_primary_key_methods).each{|k, pk| new_values << (h[k] = o.get_column_value(pk))} end if current current_values = rcks.map{|k| current[k]} jtds = jtds.where(rcks.zip(current_values)) if o if current_values != new_values jtds.update(h) end else jtds.delete end elsif o lh.each{|k,v| h[k] = v} jtds.insert(h) end end end opts[:_setter] = proc{|o| set_one_through_one_associated_object(opts, o)} else opts[:adder] ||= proc do |o| h = {} lcks.zip(lcpks).each{|k, pk| h[k] = get_column_value(pk)} rcks.zip(opts.right_primary_key_methods).each{|k, pk| h[k] = o.get_column_value(pk)} _join_table_dataset(opts).insert(h) end opts[:remover] ||= proc do |o| _join_table_dataset(opts).where(lcks.zip(lcpks.map{|k| get_column_value(k)}) + rcks.zip(opts.right_primary_key_methods.map{|k| o.get_column_value(k)})).delete end opts[:clearer] ||= proc do _join_table_dataset(opts).where(lcks.zip(lcpks.map{|k| get_column_value(k)})).delete end end end
Configures #many_to_one association reflection and adds the related association methods
# File lib/sequel/model/associations.rb, line 2043 def def_many_to_one(opts) name = opts[:name] opts[:key] = opts.default_key unless opts.has_key?(:key) key = opts[:key] opts[:eager_loader_key] = key unless opts.has_key?(:eager_loader_key) cks = opts[:graph_keys] = opts[:keys] = Array(key) opts[:key_column] ||= key opts[:graph_keys] = opts[:key_columns] = Array(opts[:key_column]) opts[:qualified_key] = opts.qualify_cur(key) if opts[:primary_key] cpks = Array(opts[:primary_key]) raise(Error, "mismatched number of keys: #{cks.inspect} vs #{cpks.inspect}") unless cks.length == cpks.length end uses_cks = opts[:uses_composite_keys] = cks.length > 1 opts[:cartesian_product_number] ||= 0 if !opts.has_key?(:many_to_one_pk_lookup) && (opts[:dataset] || opts[:conditions] || opts[:block] || opts[:select] || (opts.has_key?(:key) && opts[:key] == nil)) opts[:many_to_one_pk_lookup] = false end auto_assocs = @autoreloading_associations cks.each do |k| (auto_assocs[k] ||= []) << name end opts[:dataset] ||= opts.association_dataset_proc opts[:eager_loader] ||= proc do |eo| h = eo[:id_map] pk_meths = opts.primary_key_methods eager_load_results(opts, eo) do |assoc_record| hash_key = uses_cks ? pk_meths.map{|k| assoc_record.get_column_value(k)} : assoc_record.get_column_value(opts.primary_key_method) if objects = h[hash_key] objects.each{|object| object.associations[name] = assoc_record} end end end join_type = opts[:graph_join_type] select = opts[:graph_select] use_only_conditions = opts.include?(:graph_only_conditions) only_conditions = opts[:graph_only_conditions] conditions = opts[:graph_conditions] graph_block = opts[:graph_block] graph_cks = opts[:graph_keys] opts[:eager_grapher] ||= proc do |eo| ds = eo[:self] ds.graph(eager_graph_dataset(opts, eo), use_only_conditions ? only_conditions : opts.primary_keys.zip(graph_cks) + conditions, Hash[eo].merge!(:select=>select, :join_type=>eo[:join_type]||join_type, :qualify=>:deep, :from_self_alias=>eo[:from_self_alias]), &graph_block) end return if opts[:read_only] opts[:setter] ||= proc{|o| cks.zip(opts.primary_key_methods).each{|k, pk| set_column_value(:"#{k}=", (o.get_column_value(pk) if o))}} opts[:_setter] = proc{|o| set_associated_object(opts, o)} end
Alias of #def_many_to_many, since they share pretty much the same code.
# File lib/sequel/model/associations.rb, line 2196 def def_one_through_one(opts) def_many_to_many(opts) end
Configures #one_to_many and #one_to_one association reflections and adds the related association methods
# File lib/sequel/model/associations.rb, line 2101 def def_one_to_many(opts) one_to_one = opts[:type] == :one_to_one name = opts[:name] key = (opts[:key] ||= opts.default_key) km = opts[:key_method] ||= opts[:key] cks = opts[:keys] = Array(key) opts[:key_methods] = Array(opts[:key_method]) primary_key = (opts[:primary_key] ||= self.primary_key) opts[:eager_loader_key] = primary_key unless opts.has_key?(:eager_loader_key) cpks = opts[:primary_keys] = Array(primary_key) pkc = opts[:primary_key_column] ||= primary_key pkcs = opts[:primary_key_columns] ||= Array(pkc) raise(Error, "mismatched number of keys: #{cks.inspect} vs #{cpks.inspect}") unless cks.length == cpks.length uses_cks = opts[:uses_composite_keys] = cks.length > 1 opts[:dataset] ||= opts.association_dataset_proc opts[:eager_loader] ||= proc do |eo| h = eo[:id_map] reciprocal = opts.reciprocal assign_singular = opts.assign_singular? delete_rn = opts.delete_row_number_column eager_load_results(opts, eo) do |assoc_record| assoc_record.values.delete(delete_rn) if delete_rn hash_key = uses_cks ? km.map{|k| assoc_record.get_column_value(k)} : assoc_record.get_column_value(km) next unless objects = h[hash_key] if assign_singular objects.each do |object| unless object.associations[name] object.associations[name] = assoc_record assoc_record.associations[reciprocal] = object if reciprocal end end else objects.each do |object| object.associations[name].push(assoc_record) assoc_record.associations[reciprocal] = object if reciprocal end end end end join_type = opts[:graph_join_type] select = opts[:graph_select] use_only_conditions = opts.include?(:graph_only_conditions) only_conditions = opts[:graph_only_conditions] conditions = opts[:graph_conditions] opts[:cartesian_product_number] ||= one_to_one ? 0 : 1 graph_block = opts[:graph_block] opts[:eager_grapher] ||= proc do |eo| ds = eo[:self] ds = ds.graph(opts.apply_eager_graph_limit_strategy(eo[:limit_strategy], eager_graph_dataset(opts, eo)), use_only_conditions ? only_conditions : cks.zip(pkcs) + conditions, Hash[eo].merge!(:select=>select, :join_type=>eo[:join_type]||join_type, :qualify=>:deep, :from_self_alias=>eo[:from_self_alias]), &graph_block) # We only load reciprocals for one_to_many associations, as other reciprocals don't make sense ds.opts[:eager_graph][:reciprocals][eo[:table_alias]] = opts.reciprocal ds end return if opts[:read_only] save_opts = {:validate=>opts[:validate]} ck_nil_hash ={} cks.each{|k| ck_nil_hash[k] = nil} if one_to_one opts[:setter] ||= proc do |o| up_ds = _apply_association_options(opts, opts.associated_dataset.where(cks.zip(cpks.map{|k| get_column_value(k)}))) if o up_ds = up_ds.exclude(o.pk_hash) unless o.new? cks.zip(cpks).each{|k, pk| o.set_column_value(:"#{k}=", get_column_value(pk))} end checked_transaction do up_ds.skip_limit_check.update(ck_nil_hash) o.save(save_opts) || raise(Sequel::Error, "invalid associated object, cannot save") if o end end opts[:_setter] = proc{|o| set_one_to_one_associated_object(opts, o)} else save_opts[:raise_on_failure] = opts[:raise_on_save_failure] != false opts[:adder] ||= proc do |o| cks.zip(cpks).each{|k, pk| o.set_column_value(:"#{k}=", get_column_value(pk))} o.save(save_opts) end opts[:remover] ||= proc do |o| cks.each{|k| o.set_column_value(:"#{k}=", nil)} o.save(save_opts) end opts[:clearer] ||= proc do _apply_association_options(opts, opts.associated_dataset.where(cks.zip(cpks.map{|k| get_column_value(k)}))).update(ck_nil_hash) end end end
Alias of #def_one_to_many, since they share pretty much the same code.
# File lib/sequel/model/associations.rb, line 2201 def def_one_to_one(opts) def_one_to_many(opts) end
Return dataset to graph into given the association reflection, applying the :callback option if set.
# File lib/sequel/model/associations.rb, line 2206 def eager_graph_dataset(opts, eager_options) ds = opts.associated_class.dataset if cb = eager_options[:callback] ds = cb.call(ds) end ds end
If not caching associations, reload the database schema by default, ignoring any cached values.
# File lib/sequel/model/associations.rb, line 2216 def reload_db_schema? !@cache_associations end