class Arel::SelectManager
Public Class Methods
new(engine, table = nil)
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Calls superclass method
Arel::TreeManager.new
# File lib/arel/select_manager.rb, line 5 def initialize engine, table = nil super(engine) @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 46 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 22 def constraints @ctx.wheres end
distinct(value = true)
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# File lib/arel/select_manager.rb, line 144 def distinct(value = true) if value @ctx.set_quantifier = Arel::Nodes::Distinct.new else @ctx.set_quantifier = nil end end
except(other)
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# File lib/arel/select_manager.rb, line 186 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 42 def exists Arel::Nodes::Exists.new @ast end
from(table)
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# File lib/arel/select_manager.rb, line 83 def from table table = Nodes::SqlLiteral.new(table) if String === table # FIXME: this is a hack to support # test_with_two_tables_in_from_without_getting_double_quoted # from the AR tests. 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 99 def froms @ast.cores.map { |x| x.from }.compact end
group(*columns)
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# File lib/arel/select_manager.rb, line 72 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(*exprs)
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# File lib/arel/select_manager.rb, line 116 def having *exprs @ctx.having = Nodes::Having.new(collapse(exprs, @ctx.having)) self end
initialize_copy(other)
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Calls superclass method
Arel::TreeManager#initialize_copy
# File lib/arel/select_manager.rb, line 12 def initialize_copy other super @ctx = @ast.cores.last end
intersect(other)
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# File lib/arel/select_manager.rb, line 182 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 103 def join relation, klass = Nodes::InnerJoin return self unless relation case relation when String, Nodes::SqlLiteral raise if relation.blank? 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 228 def join_sources @ctx.source.right end
join_sql()
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# File lib/arel/select_manager.rb, line 214 def join_sql return nil if @ctx.source.right.empty? sql = visitor.dup.extend(Visitors::JoinSql).accept @ctx Nodes::SqlLiteral.new sql end
joins(manager)
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# File lib/arel/select_manager.rb, line 236 def joins manager if $VERBOSE warn "joins is deprecated and will be removed in 4.0.0" warn "please remove your call to joins from #{caller.first}" end manager.join_sql end
limit()
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# File lib/arel/select_manager.rb, line 17 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 50 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 63 def locked @ast.lock end
offset()
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# File lib/arel/select_manager.rb, line 26 def offset @ast.offset && @ast.offset.expr end
on(*exprs)
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# File lib/arel/select_manager.rb, line 67 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 152 def order *expr # FIXME: We SHOULD NOT be converting these to SqlLiteral automatically @ast.orders.concat expr.map { |x| String === x || Symbol === x ? Nodes::SqlLiteral.new(x.to_s) : x } self end
order_clauses()
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# File lib/arel/select_manager.rb, line 221 def order_clauses visitor = Visitors::OrderClauses.new(@engine.connection) visitor.accept(@ast).map { |x| Nodes::SqlLiteral.new x } end
orders()
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# File lib/arel/select_manager.rb, line 160 def orders @ast.orders end
project(*projections)
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# File lib/arel/select_manager.rb, line 127 def project *projections # FIXME: converting these to SQLLiterals is probably not good, but # rails tests require it. @ctx.projections.concat projections.map { |x| [Symbol, String].include?(x.class) ? SqlLiteral.new(x.to_s) : x } self end
projections()
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# File lib/arel/select_manager.rb, line 136 def projections @ctx.projections end
projections=(projections)
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# File lib/arel/select_manager.rb, line 140 def projections= projections @ctx.projections = projections end
skip(amount)
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# File lib/arel/select_manager.rb, line 30 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 232 def source @ctx.source end
take(limit)
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# File lib/arel/select_manager.rb, line 202 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 171 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()
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# File lib/arel/select_manager.rb, line 164 def where_sql return if @ctx.wheres.empty? viz = Visitors::WhereSql.new @engine.connection Nodes::SqlLiteral.new viz.accept @ctx end
window(name)
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# File lib/arel/select_manager.rb, line 121 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 191 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 263 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