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Allow a polymorphic :source for has_many :through associations. Closes #7143 [protocool]

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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6408 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
This commit is contained in:
Rick Olson 2007-03-13 05:23:18 +00:00
parent 2823a56f14
commit e3dab67c44
6 changed files with 143 additions and 49 deletions
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2
activerecord/CHANGELOG
View file

@ -1,5 +1,7 @@
*SVN*
* Allow a polymorphic :source for has_many :through associations. Closes #7143 [protocool]
* Consistent public/protected/private visibility for chained methods. #7813 [Dan Manges]
* Oracle: fix quoted primary keys and datetime overflow. #7798 [Michael Schoen]

156
activerecord/lib/active_record/associations.rb
View file

@ -20,7 +20,13 @@ module ActiveRecord
super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' on the polymorphic object '#{source_reflection.class_name}##{source_reflection.name}'.")
end
end
class HasManyThroughAssociationPointlessSourceTypeError < ActiveRecordError #:nodoc:
def initialize(owner_class_name, reflection, source_reflection)
super("Cannot have a has_many :through association '#{owner_class_name}##{reflection.name}' with a :source_type option if the '#{reflection.through_reflection.class_name}##{source_reflection.name}' is not polymorphic. Try removing :source_type on your association.")
end
end
class HasManyThroughSourceAssociationNotFoundError < ActiveRecordError #:nodoc:
def initialize(reflection)
through_reflection = reflection.through_reflection
@ -593,6 +599,8 @@ module ActiveRecord
# * <tt>:source</tt>: Specifies the source association name used by <tt>has_many :through</tt> queries. Only use it if the name cannot be
# inferred from the association. <tt>has_many :subscribers, :through => :subscriptions</tt> will look for either +:subscribers+ or
# +:subscriber+ on +Subscription+, unless a +:source+ is given.
# * <tt>:source_type</tt>: Specifies type of the source association used by <tt>has_many :through</tt> queries where the source association
# is a polymorphic belongs_to.
# * <tt>:uniq</tt> - if set to true, duplicates will be omitted from the collection. Useful in conjunction with :through.
#
# Option examples:
@ -1151,7 +1159,7 @@ module ActiveRecord
:class_name, :table_name, :foreign_key,
:exclusively_dependent, :dependent,
:select, :conditions, :include, :order, :group, :limit, :offset,
:as, :through, :source,
:as, :through, :source, :source_type,
:uniq,
:finder_sql, :counter_sql,
:before_add, :after_add, :before_remove, :after_remove,
@ -1555,58 +1563,113 @@ module ActiveRecord
case
when reflection.macro == :has_many && reflection.options[:through]
through_conditions = through_reflection.options[:conditions] ? "AND #{interpolate_sql(sanitize_sql(through_reflection.options[:conditions]))}" : ''
jt_foreign_key = jt_as_extra = jt_source_extra = jt_sti_extra = nil
first_key = second_key = as_extra = nil
if through_reflection.options[:as] # has_many :through against a polymorphic join
polymorphic_foreign_key = through_reflection.options[:as].to_s + '_id'
polymorphic_foreign_type = through_reflection.options[:as].to_s + '_type'
" LEFT OUTER JOIN %s ON (%s.%s = %s.%s AND %s.%s = %s) " % [
table_alias_for(through_reflection.klass.table_name, aliased_join_table_name),
aliased_join_table_name, polymorphic_foreign_key,
parent.aliased_table_name, parent.primary_key,
aliased_join_table_name, polymorphic_foreign_type, klass.quote_value(parent.active_record.base_class.name)] +
" LEFT OUTER JOIN %s ON %s.%s = %s.%s " % [table_name_and_alias,
aliased_table_name, primary_key, aliased_join_table_name, options[:foreign_key] || reflection.klass.to_s.foreign_key
####polymorphic_foreign_key = through_reflection.options[:as].to_s + '_id'
####polymorphic_foreign_type = through_reflection.options[:as].to_s + '_type'
####
####" LEFT OUTER JOIN %s ON (%s.%s = %s.%s AND %s.%s = %s) " % [
#### table_alias_for(through_reflection.klass.table_name, aliased_join_table_name),
#### aliased_join_table_name, polymorphic_foreign_key,
#### parent.aliased_table_name, parent.primary_key,
#### aliased_join_table_name, polymorphic_foreign_type, klass.quote_value(parent.active_record.base_class.name)] +
####" LEFT OUTER JOIN %s ON %s.%s = %s.%s " % [table_name_and_alias,
#### aliased_table_name, primary_key, aliased_join_table_name, options[:foreign_key] || reflection.klass.to_s.foreign_key
jt_foreign_key = through_reflection.options[:as].to_s + '_id'
jt_as_extra = " AND %s.%s = %s" % [
aliased_join_table_name,
reflection.active_record.connection.quote_column_name(through_reflection.options[:as].to_s + '_type'),
klass.quote_value(parent.active_record.base_class.name)
]
else
if source_reflection.macro == :has_many && source_reflection.options[:as]
" LEFT OUTER JOIN %s ON %s.%s = %s.%s " % [
table_alias_for(through_reflection.klass.table_name, aliased_join_table_name), aliased_join_table_name,
through_reflection.primary_key_name,
parent.aliased_table_name, parent.primary_key] +
" LEFT OUTER JOIN %s ON %s.%s = %s.%s AND %s.%s = %s " % [
table_name_and_alias,
aliased_table_name, "#{source_reflection.options[:as]}_id",
aliased_join_table_name, options[:foreign_key] || primary_key,
aliased_table_name, "#{source_reflection.options[:as]}_type",
klass.quote_value(source_reflection.active_record.base_class.name)
##if source_reflection.macro == :has_many && source_reflection.options[:as]
####" LEFT OUTER JOIN %s ON %s.%s = %s.%s " % [
#### table_alias_for(through_reflection.klass.table_name, aliased_join_table_name), aliased_join_table_name,
#### through_reflection.primary_key_name,
#### parent.aliased_table_name, parent.primary_key] +
####" LEFT OUTER JOIN %s ON %s.%s = %s.%s AND %s.%s = %s " % [
#### table_name_and_alias,
#### aliased_table_name, "#{source_reflection.options[:as]}_id",
#### aliased_join_table_name, options[:foreign_key] || primary_key,
#### aliased_table_name, "#{source_reflection.options[:as]}_type",
#### klass.quote_value(source_reflection.active_record.base_class.name)
jt_foreign_key = through_reflection.primary_key_name
end
case source_reflection.macro
when :has_many
if source_reflection.options[:as]
first_key = "#{source_reflection.options[:as]}_id"
second_key = options[:foreign_key] || primary_key
as_extra = " AND %s.%s = %s" % [
aliased_table_name,
reflection.active_record.connection.quote_column_name("#{source_reflection.options[:as]}_type"),
klass.quote_value(source_reflection.active_record.base_class.name)
]
else
case source_reflection.macro
when :belongs_to
first_key = primary_key
second_key = source_reflection.options[:foreign_key] || klass.to_s.foreign_key
extra = nil
when :has_many
first_key = through_reflection.klass.base_class.to_s.foreign_key
second_key = options[:foreign_key] || primary_key
extra = through_reflection.klass.descends_from_active_record? ? nil :
" AND %s.%s = %s" % [
aliased_join_table_name,
reflection.active_record.connection.quote_column_name(through_reflection.active_record.inheritance_column),
through_reflection.klass.quote_value(through_reflection.klass.name.demodulize)]
end
" LEFT OUTER JOIN %s ON (%s.%s = %s.%s%s) " % [
table_alias_for(through_reflection.klass.table_name, aliased_join_table_name),
aliased_join_table_name, through_reflection.primary_key_name,
parent.aliased_table_name, parent.primary_key, extra] +
" LEFT OUTER JOIN %s ON (%s.%s = %s.%s) " % [
table_name_and_alias,
aliased_table_name, first_key,
aliased_join_table_name, second_key
####case source_reflection.macro
#### when :belongs_to
#### first_key = primary_key
#### second_key = source_reflection.options[:foreign_key] || klass.to_s.foreign_key
#### extra = nil
#### when :has_many
#### first_key = through_reflection.klass.base_class.to_s.foreign_key
#### second_key = options[:foreign_key] || primary_key
#### extra = through_reflection.klass.descends_from_active_record? ? nil :
#### " AND %s.%s = %s" % [
#### aliased_join_table_name,
#### reflection.active_record.connection.quote_column_name(through_reflection.active_record.inheritance_column),
#### through_reflection.klass.quote_value(through_reflection.klass.name.demodulize)]
####end
####" LEFT OUTER JOIN %s ON (%s.%s = %s.%s%s) " % [
#### table_alias_for(through_reflection.klass.table_name, aliased_join_table_name),
#### aliased_join_table_name, through_reflection.primary_key_name,
#### parent.aliased_table_name, parent.primary_key, extra] +
####" LEFT OUTER JOIN %s ON (%s.%s = %s.%s) " % [
#### table_name_and_alias,
#### aliased_table_name, first_key,
#### aliased_join_table_name, second_key
####]
first_key = through_reflection.klass.base_class.to_s.foreign_key
second_key = options[:foreign_key] || primary_key
end
unless through_reflection.klass.descends_from_active_record?
jt_sti_extra = " AND %s.%s = %s" % [
aliased_join_table_name,
reflection.active_record.connection.quote_column_name(through_reflection.active_record.inheritance_column),
through_reflection.klass.quote_value(through_reflection.klass.name.demodulize)]
end
when :belongs_to
first_key = primary_key
if reflection.options[:source_type]
second_key = source_reflection.association_foreign_key
jt_source_extra = " AND %s.%s = %s" % [
aliased_join_table_name,
reflection.active_record.connection.quote_column_name(reflection.source_reflection.options[:foreign_type]),
klass.quote_value(reflection.options[:source_type])
]
else
second_key = source_reflection.options[:foreign_key] || klass.to_s.foreign_key
end
end
" LEFT OUTER JOIN %s ON (%s.%s = %s.%s%s%s%s) " % [
table_alias_for(through_reflection.klass.table_name, aliased_join_table_name),
parent.aliased_table_name, reflection.active_record.connection.quote_column_name(parent.primary_key),
aliased_join_table_name, reflection.active_record.connection.quote_column_name(jt_foreign_key),
jt_as_extra, jt_source_extra, jt_sti_extra
] +
" LEFT OUTER JOIN %s ON (%s.%s = %s.%s%s) " % [
table_name_and_alias,
aliased_table_name, reflection.active_record.connection.quote_column_name(first_key),
aliased_join_table_name, reflection.active_record.connection.quote_column_name(second_key),
as_extra
]
when reflection.macro == :has_many && reflection.options[:as]
" LEFT OUTER JOIN %s ON %s.%s = %s.%s AND %s.%s = %s" % [
table_name_and_alias,
@ -1652,6 +1715,7 @@ module ActiveRecord
end
protected
def pluralize(table_name)
ActiveRecord::Base.pluralize_table_names ? table_name.to_s.pluralize : table_name
end

12
activerecord/lib/active_record/associations/has_many_through_association.rb
View file

@ -138,7 +138,11 @@ module ActiveRecord
# Construct attributes for :through pointing to owner and associate.
def construct_join_attributes(associate)
construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id)
returning construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id) do |join_attributes|
if @reflection.options[:source_type]
join_attributes.merge!(@reflection.source_reflection.options[:foreign_type] => associate.class.base_class.name.to_s)
end
end
end
# Associate attributes pointing to owner, quoted.
@ -176,6 +180,12 @@ module ActiveRecord
if @reflection.through_reflection.options[:as] || @reflection.source_reflection.macro == :belongs_to
reflection_primary_key = @reflection.klass.primary_key
source_primary_key = @reflection.source_reflection.primary_key_name
if @reflection.options[:source_type]
polymorphic_join = "AND %s.%s = %s" % [
@reflection.through_reflection.table_name, "#{@reflection.source_reflection.options[:foreign_type]}",
@owner.class.quote_value(@reflection.options[:source_type])
]
end
else
reflection_primary_key = @reflection.source_reflection.primary_key_name
source_primary_key = @reflection.klass.primary_key

8
activerecord/lib/active_record/reflection.rb
View file

@ -178,8 +178,12 @@ module ActiveRecord
if source_reflection.nil?
raise HasManyThroughSourceAssociationNotFoundError.new(self)
end
if options[:source_type] && source_reflection.options[:polymorphic].nil?
raise HasManyThroughAssociationPointlessSourceTypeError.new(active_record.name, self, source_reflection)
end
if source_reflection.options[:polymorphic]
if source_reflection.options[:polymorphic] && options[:source_type].nil?
raise HasManyThroughAssociationPolymorphicError.new(active_record.name, self, source_reflection)
end
@ -193,7 +197,7 @@ module ActiveRecord
def derive_class_name
# get the class_name of the belongs_to association of the through reflection
if through_reflection
source_reflection.class_name
options[:source_type] || source_reflection.class_name
else
class_name = name.to_s.camelize
class_name = class_name.singularize if [ :has_many, :has_and_belongs_to_many ].include?(macro)

12
activerecord/test/associations/join_model_test.rb
View file

@ -300,6 +300,18 @@ class AssociationsJoinModelTest < Test::Unit::TestCase
assert_equal [posts(:welcome), posts(:thinking)], tags(:general).taggings.find(:all, :include => :taggable)
end
end
def test_has_many_polymorphic_with_source_type
assert_equal [posts(:welcome), posts(:thinking)], tags(:general).tagged_posts
end
def test_eager_has_many_polymorphic_with_source_type
tag_with_include = Tag.find(tags(:general).id, :include => :tagged_posts)
desired = [posts(:welcome), posts(:thinking)]
assert_no_queries do
assert_equal desired, tag_with_include.tagged_posts
end
end
def test_has_many_through_has_many_find_all
assert_equal comments(:greetings), authors(:david).comments.find(:all, :order => 'comments.id').first

2
activerecord/test/fixtures/tag.rb vendored
View file

@ -2,4 +2,6 @@ class Tag < ActiveRecord::Base
has_many :taggings
has_many :taggables, :through => :taggings
has_one :tagging
has_many :tagged_posts, :through => :taggings, :source => :taggable, :source_type => 'Post'
end