-require 'rubygems'
-gem 'composite_primary_keys', '= 0.9.93'
-require 'composite_primary_keys'
+module ActiveRecord
+ module Associations
+ class AssociationScope
+ def add_constraints(scope)
+ tables = construct_tables
+
+ chain.each_with_index do |reflection, i|
+ table, foreign_table = tables.shift, tables.first
+
+ if reflection.source_macro == :has_and_belongs_to_many
+ join_table = tables.shift
+
+ # CPK
+ # scope = scope.joins(join(
+ # join_table,
+ # table[reflection.active_record_primary_key].
+ # eq(join_table[reflection.association_foreign_key])
+ #))
+ predicate = cpk_join_predicate(table, reflection.association_primary_key,
+ join_table, reflection.association_foreign_key)
+ scope = scope.joins(join(join_table, predicate))
+
+ table, foreign_table = join_table, tables.first
+ end
+
+ if reflection.source_macro == :belongs_to
+ if reflection.options[:polymorphic]
+ key = reflection.association_primary_key(klass)
+ else
+ key = reflection.association_primary_key
+ end
+
+ foreign_key = reflection.foreign_key
+ else
+ key = reflection.foreign_key
+ foreign_key = reflection.active_record_primary_key
+ end
+
+ conditions = self.conditions[i]
+
+ if reflection == chain.last
+ # CPK
+ # scope = scope.where(table[key].eq(owner[foreign_key]))
+ predicate = cpk_join_predicate(table, key, owner, foreign_key)
+ scope = scope.where(predicate)
+
+ if reflection.type
+ scope = scope.where(table[reflection.type].eq(owner.class.base_class.name))
+ end
+
+ conditions.each do |condition|
+ if options[:through] && condition.is_a?(Hash)
+ condition = { table.name => condition }
+ end
+
+ scope = scope.where(interpolate(condition))
+ end
+ else
+ # CPK
+ # constraint = table[key].eq(foreign_table[foreign_key])
+ constraint = cpk_join_predicate(table, key, foreign_table, foreign_key)
+
+ if reflection.type
+ type = chain[i + 1].klass.base_class.name
+ constraint = constraint.and(table[reflection.type].eq(type))
+ end
+
+ scope = scope.joins(join(foreign_table, constraint))
+
+ unless conditions.empty?
+ scope = scope.where(sanitize(conditions, table))
+ end
+ end
+ end
+
+ scope
+ end
+ end
+ end
+end