module Sequel::Plugins::ManyThroughMany::DatasetMethods
Private Instance Methods
many_through_many_association_filter_expression(op, ref, obj)
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Use a subquery to filter rows to those related to the given associated object
# File lib/sequel/plugins/many_through_many.rb, line 288 def many_through_many_association_filter_expression(op, ref, obj) lpks = ref[:left_primary_key_columns] lpks = lpks.first if lpks.length == 1 lpks = ref.qualify(model.table_name, lpks) edges = ref.edges first, rest = edges.first, edges[1..-1] ds = model.db[first[:table]].select(*Array(ref.qualify(first[:table], first[:right]))) rest.each{|e| ds = ds.join(e[:table], e.fetch(:only_conditions, (Array(e[:right]).zip(Array(e[:left])) + e[:conditions])), :table_alias=>ds.unused_table_alias(e[:table]), :qualify=>:deep, &e[:block])} last_alias = if rest.empty? first[:table] else last_join = ds.opts[:join].last last_join.table_alias || last_join.table end meths = if obj.is_a?(Sequel::Dataset) ref.qualify(obj.model.table_name, ref.right_primary_keys) else ref.right_primary_key_methods end expr = association_filter_key_expression(ref.qualify(last_alias, Array(ref.final_edge[:left])), meths, obj) unless expr == SQL::Constants::FALSE ds = ds.where(expr).exclude(SQL::BooleanExpression.from_value_pairs(ds.opts[:select].zip([]), :OR)) expr = SQL::BooleanExpression.from_value_pairs(lpks=>ds) expr = add_association_filter_conditions(ref, obj, expr) end association_filter_handle_inversion(op, expr, Array(lpks)) end
Also aliased as: one_through_many_association_filter_expression
one_through_many_association_filter_expression(op, ref, obj)