class Arel::SelectManager
Constants
- STRING_OR_SYMBOL_CLASS
Public Class Methods
new(table = nil)
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Calls superclass method
Arel::TreeManager.new
# File lib/arel/select_manager.rb, line 10 def initialize table = nil super() @ast = Nodes::SelectStatement.new @ctx = @ast.cores.last from table end
Public Instance Methods
as(other)
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# File lib/arel/select_manager.rb, line 51 def as other create_table_alias grouping(@ast), Nodes::SqlLiteral.new(other) end
constraints()
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# File lib/arel/select_manager.rb, line 27 def constraints @ctx.wheres end
distinct(value = true)
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# File lib/arel/select_manager.rb, line 150 def distinct(value = true) if value @ctx.set_quantifier = Arel::Nodes::Distinct.new else @ctx.set_quantifier = nil end self end
distinct_on(value)
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# File lib/arel/select_manager.rb, line 159 def distinct_on(value) if value @ctx.set_quantifier = Arel::Nodes::DistinctOn.new(value) else @ctx.set_quantifier = nil end self end
except(other)
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# File lib/arel/select_manager.rb, line 202 def except other Nodes::Except.new ast, other.ast end
Also aliased as: minus
exists()
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Produces an Arel::Nodes::Exists node
# File lib/arel/select_manager.rb, line 47 def exists Arel::Nodes::Exists.new @ast end
from(table)
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# File lib/arel/select_manager.rb, line 88 def from table table = Nodes::SqlLiteral.new(table) if String === table case table when Nodes::Join @ctx.source.right << table else @ctx.source.left = table end self end
froms()
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# File lib/arel/select_manager.rb, line 101 def froms @ast.cores.map { |x| x.from }.compact end
group(*columns)
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# File lib/arel/select_manager.rb, line 77 def group *columns columns.each do |column| # FIXME: backwards compat column = Nodes::SqlLiteral.new(column) if String === column column = Nodes::SqlLiteral.new(column.to_s) if Symbol === column @ctx.groups.push Nodes::Group.new column end self end
having(expr)
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# File lib/arel/select_manager.rb, line 122 def having expr @ctx.havings << expr self end
initialize_copy(other)
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Calls superclass method
Arel::TreeManager#initialize_copy
# File lib/arel/select_manager.rb, line 17 def initialize_copy other super @ctx = @ast.cores.last end
intersect(other)
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# File lib/arel/select_manager.rb, line 198 def intersect other Nodes::Intersect.new ast, other.ast end
join(relation, klass = Nodes::InnerJoin)
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# File lib/arel/select_manager.rb, line 105 def join relation, klass = Nodes::InnerJoin return self unless relation case relation when String, Nodes::SqlLiteral raise EmptyJoinError if relation.empty? klass = Nodes::StringJoin end @ctx.source.right << create_join(relation, nil, klass) self end
join_sources()
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# File lib/arel/select_manager.rb, line 230 def join_sources @ctx.source.right end
limit()
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# File lib/arel/select_manager.rb, line 22 def limit @ast.limit && @ast.limit.expr end
Also aliased as: taken
lock(locking = Arel.sql('FOR UPDATE'))
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# File lib/arel/select_manager.rb, line 55 def lock locking = Arel.sql('FOR UPDATE') case locking when true locking = Arel.sql('FOR UPDATE') when Arel::Nodes::SqlLiteral when String locking = Arel.sql locking end @ast.lock = Nodes::Lock.new(locking) self end
locked()
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# File lib/arel/select_manager.rb, line 68 def locked @ast.lock end
offset()
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# File lib/arel/select_manager.rb, line 31 def offset @ast.offset && @ast.offset.expr end
on(*exprs)
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# File lib/arel/select_manager.rb, line 72 def on *exprs @ctx.source.right.last.right = Nodes::On.new(collapse(exprs)) self end
order(*expr)
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# File lib/arel/select_manager.rb, line 168 def order *expr # FIXME: We SHOULD NOT be converting these to SqlLiteral automatically @ast.orders.concat expr.map { |x| STRING_OR_SYMBOL_CLASS.include?(x.class) ? Nodes::SqlLiteral.new(x.to_s) : x } self end
orders()
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# File lib/arel/select_manager.rb, line 176 def orders @ast.orders end
outer_join(relation)
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# File lib/arel/select_manager.rb, line 118 def outer_join relation join(relation, Nodes::OuterJoin) end
project(*projections)
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# File lib/arel/select_manager.rb, line 133 def project *projections # FIXME: converting these to SQLLiterals is probably not good, but # rails tests require it. @ctx.projections.concat projections.map { |x| STRING_OR_SYMBOL_CLASS.include?(x.class) ? Nodes::SqlLiteral.new(x.to_s) : x } self end
projections()
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# File lib/arel/select_manager.rb, line 142 def projections @ctx.projections end
projections=(projections)
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# File lib/arel/select_manager.rb, line 146 def projections= projections @ctx.projections = projections end
skip(amount)
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# File lib/arel/select_manager.rb, line 35 def skip amount if amount @ast.offset = Nodes::Offset.new(amount) else @ast.offset = nil end self end
Also aliased as: offset=
source()
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# File lib/arel/select_manager.rb, line 234 def source @ctx.source end
take(limit)
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# File lib/arel/select_manager.rb, line 218 def take limit if limit @ast.limit = Nodes::Limit.new(limit) @ctx.top = Nodes::Top.new(limit) else @ast.limit = nil @ctx.top = nil end self end
Also aliased as: limit=
union(operation, other = nil)
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# File lib/arel/select_manager.rb, line 187 def union operation, other = nil if other node_class = Nodes.const_get("Union#{operation.to_s.capitalize}") else other = operation node_class = Nodes::Union end node_class.new self.ast, other.ast end
where_sql(engine = Table.engine)
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# File lib/arel/select_manager.rb, line 180 def where_sql engine = Table.engine return if @ctx.wheres.empty? viz = Visitors::WhereSql.new(engine.connection.visitor, engine.connection) Nodes::SqlLiteral.new viz.accept(@ctx, Collectors::SQLString.new).value end
window(name)
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# File lib/arel/select_manager.rb, line 127 def window name window = Nodes::NamedWindow.new(name) @ctx.windows.push window window end
with(*subqueries)
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# File lib/arel/select_manager.rb, line 207 def with *subqueries if subqueries.first.is_a? Symbol node_class = Nodes.const_get("With#{subqueries.shift.to_s.capitalize}") else node_class = Nodes::With end @ast.with = node_class.new(subqueries.flatten) self end
Private Instance Methods
collapse(exprs, existing = nil)
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# File lib/arel/select_manager.rb, line 251 def collapse exprs, existing = nil exprs = exprs.unshift(existing.expr) if existing exprs = exprs.compact.map { |expr| if String === expr # FIXME: Don't do this automatically Arel.sql(expr) else expr end } if exprs.length == 1 exprs.first else create_and exprs end end