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add a comment to belongs_to extension

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Konstantin Haase 2015-02-23 16:58:55 +01:00
parent 5f2dc47e07
commit d78a5b8883
1 changed files with 17 additions and 0 deletions
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lib/travis/api/v3/extensions/belongs_to.rb
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@ -1,5 +1,22 @@
module Travis::API::V3 module Travis::API::V3
module Extensions module Extensions
# This is a patch to ActiveRecord to allow classes for polymorphic relations to be nested in a module without the
# module name being part of the type field.
#
# Example:
#
# # Without this patch
# Repository.find(2).owner.class # => User
# Travis::API::V3::Models::Repository.find(2).owner.class # => User
#
# # With this patch
# Repository.find(2).owner.class # => User
# Travis::API::V3::Models::Repository.find(2).owner.class # => Travis::API::V3::Models::User
#
# ActiveRecord does not support this out of the box. We accomplish this feature by tracking polymorphic relations
# and then adding the namespace when calling ActiveRecord::Base#[] with the foreign type key and removing it again
# in ActiveRecord::Base#[]=, so we don't break other code by accidentially writing the prefixed version to the
# database.
module BelongsTo module BelongsTo
module ClassMethods module ClassMethods
def polymorfic_foreign_types def polymorfic_foreign_types