Use a subquery to filter rows to those related to the given associated object
# File lib/sequel/plugins/many_through_many.rb, line 245 245: def many_through_many_association_filter_expression(op, ref, obj) 246: lpks = ref[:left_primary_keys] 247: lpks = lpks.first if lpks.length == 1 248: lpks = ref.qualify(model.table_name, lpks) 249: edges = ref.edges 250: first, rest = edges.first, edges[1..1] 251: last = edges.last 252: ds = model.db[first[:table]].select(*Array(ref.qualify(first[:table], first[:right]))) 253: 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]), &e[:block])} 254: last_alias = if rest.empty? 255: first[:table] 256: else 257: last_join = ds.opts[:join].last 258: last_join.table_alias || last_join.table 259: end 260: meths = ref.right_primary_keys 261: meths = ref.qualify(obj.model.table_name, meths) if obj.is_a?(Sequel::Dataset) 262: exp = association_filter_key_expression(ref.qualify(last_alias, Array(ref.final_edge[:left])), meths, obj) 263: if exp == SQL::Constants::FALSE 264: association_filter_handle_inversion(op, exp, Array(lpks)) 265: else 266: ds = ds.where(exp).exclude(SQL::BooleanExpression.from_value_pairs(ds.opts[:select].zip([]), :OR)) 267: association_filter_handle_inversion(op, SQL::BooleanExpression.from_value_pairs(lpks=>ds), Array(lpks)) 268: end 269: end
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