module Sequel::Plugins::ManyThroughMany::DatasetMethods
Private Instance Methods
Source
# File lib/sequel/plugins/many_through_many.rb 403 def many_through_many_association_filter_expression(op, ref, obj) 404 lpks = ref[:left_primary_key_columns] 405 lpks = lpks.first if lpks.length == 1 406 lpks = ref.qualify(model.table_name, lpks) 407 edges = ref.edges 408 first, rest = edges.first, edges[1..-1] 409 ds = model.db[first[:table]].select(*Array(ref.qualify(first[:table], first[:right]))) 410 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])} 411 last_alias = if rest.empty? 412 first[:table] 413 else 414 last_join = ds.opts[:join].last 415 last_join.table_alias || last_join.table 416 end 417 418 meths = if obj.is_a?(Sequel::Dataset) 419 ref.qualify(obj.model.table_name, ref.right_primary_keys) 420 else 421 ref.right_primary_key_methods 422 end 423 424 expr = association_filter_key_expression(ref.qualify(last_alias, Array(ref.final_edge[:left])), meths, obj) 425 unless expr == SQL::Constants::FALSE 426 ds = ds.where(expr).exclude(SQL::BooleanExpression.from_value_pairs(ds.opts[:select].zip([]), :OR)) 427 expr = SQL::BooleanExpression.from_value_pairs(lpks=>ds) 428 expr = add_association_filter_conditions(ref, obj, expr) 429 end 430 431 association_filter_handle_inversion(op, expr, Array(lpks)) 432 end
Use a subquery to filter rows to those related to the given associated object
Also aliased as: one_through_many_association_filter_expression