diff options
Diffstat (limited to 'activerecord/lib/active_record/associations/association_scope.rb')
| -rw-r--r-- | activerecord/lib/active_record/associations/association_scope.rb | 120 |
1 files changed, 58 insertions, 62 deletions
diff --git a/activerecord/lib/active_record/associations/association_scope.rb b/activerecord/lib/active_record/associations/association_scope.rb index badde9973f..0a90a6104a 100644 --- a/activerecord/lib/active_record/associations/association_scope.rb +++ b/activerecord/lib/active_record/associations/association_scope.rb @@ -1,8 +1,10 @@ +# frozen_string_literal: true + module ActiveRecord module Associations class AssociationScope #:nodoc: - def self.scope(association, connection) - INSTANCE.scope(association, connection) + def self.scope(association) + INSTANCE.scope(association) end def self.create(&block) @@ -16,20 +18,15 @@ module ActiveRecord INSTANCE = create - def scope(association, connection) + def scope(association) klass = association.klass reflection = association.reflection scope = klass.unscoped owner = association.owner - alias_tracker = AliasTracker.create connection, association.klass.table_name, klass.type_caster - chain_head, chain_tail = get_chain(reflection, association, alias_tracker) - - scope.extending! Array(reflection.options[:extend]) - add_constraints(scope, owner, klass, reflection, chain_head, chain_tail) - end + chain = get_chain(reflection, association, scope.alias_tracker) - def join_type - Arel::Nodes::InnerJoin + scope.extending! reflection.extensions + add_constraints(scope, owner, chain) end def self.get_bind_values(owner, chain) @@ -38,39 +35,36 @@ module ActiveRecord binds << last_reflection.join_id_for(owner) if last_reflection.type - binds << owner.class.base_class.name + binds << owner.class.polymorphic_name end chain.each_cons(2).each do |reflection, next_reflection| if reflection.type - binds << next_reflection.klass.base_class.name + binds << next_reflection.klass.polymorphic_name end end binds end - # TODO Change this to private once we've dropped Ruby 2.2 support. - # Workaround for Ruby 2.2 "private attribute?" warning. - protected - + private attr_reader :value_transformation - private def join(table, constraint) - table.create_join(table, table.create_on(constraint), join_type) + table.create_join(table, table.create_on(constraint)) end - def last_chain_scope(scope, table, reflection, owner, association_klass) - join_keys = reflection.join_keys(association_klass) + def last_chain_scope(scope, reflection, owner) + join_keys = reflection.join_keys key = join_keys.key foreign_key = join_keys.foreign_key + table = reflection.aliased_table value = transform_value(owner[foreign_key]) - scope = scope.where(table.name => { key => value }) + scope = apply_scope(scope, table, key, value) if reflection.type - polymorphic_type = transform_value(owner.class.base_class.name) - scope = scope.where(table.name => { reflection.type => polymorphic_type }) + polymorphic_type = transform_value(owner.class.polymorphic_name) + scope = apply_scope(scope, table, reflection.type, polymorphic_type) end scope @@ -80,28 +74,29 @@ module ActiveRecord value_transformation.call(value) end - def next_chain_scope(scope, table, reflection, association_klass, foreign_table, next_reflection) - join_keys = reflection.join_keys(association_klass) + def next_chain_scope(scope, reflection, next_reflection) + join_keys = reflection.join_keys key = join_keys.key foreign_key = join_keys.foreign_key + table = reflection.aliased_table + foreign_table = next_reflection.aliased_table constraint = table[key].eq(foreign_table[foreign_key]) if reflection.type - value = transform_value(next_reflection.klass.base_class.name) - scope = scope.where(table.name => { reflection.type => value }) + value = transform_value(next_reflection.klass.polymorphic_name) + scope = apply_scope(scope, table, reflection.type, value) end - scope = scope.joins(join(foreign_table, constraint)) + scope.joins!(join(foreign_table, constraint)) end class ReflectionProxy < SimpleDelegator # :nodoc: - attr_accessor :next - attr_reader :alias_name + attr_reader :aliased_table - def initialize(reflection, alias_name) + def initialize(reflection, aliased_table) super(reflection) - @alias_name = alias_name + @aliased_table = aliased_table end def all_includes; nil; end @@ -109,39 +104,34 @@ module ActiveRecord def get_chain(reflection, association, tracker) name = reflection.name - runtime_reflection = Reflection::RuntimeReflection.new(reflection, association) - previous_reflection = runtime_reflection + chain = [Reflection::RuntimeReflection.new(reflection, association)] reflection.chain.drop(1).each do |refl| - alias_name = tracker.aliased_table_for(refl.table_name, refl.alias_candidate(name)) - proxy = ReflectionProxy.new(refl, alias_name) - previous_reflection.next = proxy - previous_reflection = proxy + aliased_table = tracker.aliased_table_for( + refl.table_name, + refl.alias_candidate(name), + refl.klass.type_caster + ) + chain << ReflectionProxy.new(refl, aliased_table) end - [runtime_reflection, previous_reflection] + chain end - def add_constraints(scope, owner, association_klass, refl, chain_head, chain_tail) - owner_reflection = chain_tail - table = owner_reflection.alias_name - scope = last_chain_scope(scope, table, owner_reflection, owner, association_klass) - - reflection = chain_head - while reflection - table = reflection.alias_name - next_reflection = reflection.next + def add_constraints(scope, owner, chain) + scope = last_chain_scope(scope, chain.last, owner) - unless reflection == chain_tail - foreign_table = next_reflection.alias_name - scope = next_chain_scope(scope, table, reflection, association_klass, foreign_table, next_reflection) - end + chain.each_cons(2) do |reflection, next_reflection| + scope = next_chain_scope(scope, reflection, next_reflection) + end + chain_head = chain.first + chain.reverse_each do |reflection| # Exclude the scope of the association itself, because that # was already merged in the #scope method. reflection.constraints.each do |scope_chain_item| - item = eval_scope(reflection.klass, table, scope_chain_item, owner) + item = eval_scope(reflection, scope_chain_item, owner) - if scope_chain_item == refl.scope - scope.merge! item.except(:where, :includes) + if scope_chain_item == chain_head.scope + scope.merge! item.except(:where, :includes, :unscope, :order) end reflection.all_includes do @@ -150,18 +140,24 @@ module ActiveRecord scope.unscope!(*item.unscope_values) scope.where_clause += item.where_clause - scope.order_values |= item.order_values + scope.order_values = item.order_values | scope.order_values end - - reflection = next_reflection end scope end - def eval_scope(klass, table, scope, owner) - predicate_builder = PredicateBuilder.new(TableMetadata.new(klass, table)) - ActiveRecord::Relation.create(klass, table, predicate_builder).instance_exec(owner, &scope) + def apply_scope(scope, table, key, value) + if scope.table == table + scope.where!(key => value) + else + scope.where!(table.name => { key => value }) + end + end + + def eval_scope(reflection, scope, owner) + relation = reflection.build_scope(reflection.aliased_table) + relation.instance_exec(owner, &scope) || relation end end end |