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[ci skip] setting :inverse_of works with :as, :through and :polymorphic options, and is needed for bi-directionality with a scope

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[ci skip] Remove :conditions opion from association basics guide

This got replaced by scopes.
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Bart de Water 2017-12-14 08:22:25 -05:00
parent 5a593486f5
commit 4ab4364a51
2 changed files with 27 additions and 29 deletions
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30
activerecord/lib/active_record/associations.rb
View file

@ -1061,12 +1061,6 @@ module ActiveRecord
# belongs_to :dungeon, inverse_of: :evil_wizard
# end
#
# There are limitations to <tt>:inverse_of</tt> support:
#
# * does not work with <tt>:through</tt> associations.
# * does not work with <tt>:polymorphic</tt> associations.
# * inverse associations for #belongs_to associations #has_many are ignored.
#
# For more information, see the documentation for the +:inverse_of+ option.
#
# == Deleting from associations
@ -1279,6 +1273,9 @@ module ActiveRecord
# Specify the foreign key used for the association. By default this is guessed to be the name
# of this class in lower-case and "_id" suffixed. So a Person class that makes a #has_many
# association will use "person_id" as the default <tt>:foreign_key</tt>.
#
# If you are going to modify the association (rather than just read from it), then it is
# a good idea to set the <tt>:inverse_of</tt> option.
# [:foreign_type]
# Specify the column used to store the associated object's type, if this is a polymorphic
# association. By default this is guessed to be the name of the polymorphic association
@ -1352,8 +1349,7 @@ module ActiveRecord
# <tt>:autosave</tt> to <tt>true</tt>.
# [:inverse_of]
# Specifies the name of the #belongs_to association on the associated object
# that is the inverse of this #has_many association. Does not work in combination
# with <tt>:through</tt> or <tt>:as</tt> options.
# that is the inverse of this #has_many association.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
# [:extend]
# Specifies a module or array of modules that will be extended into the association object returned.
@ -1449,6 +1445,9 @@ module ActiveRecord
# Specify the foreign key used for the association. By default this is guessed to be the name
# of this class in lower-case and "_id" suffixed. So a Person class that makes a #has_one association
# will use "person_id" as the default <tt>:foreign_key</tt>.
#
# If you are going to modify the association (rather than just read from it), then it is
# a good idea to set the <tt>:inverse_of</tt> option.
# [:foreign_type]
# Specify the column used to store the associated object's type, if this is a polymorphic
# association. By default this is guessed to be the name of the polymorphic association
@ -1464,6 +1463,9 @@ module ActiveRecord
# <tt>:primary_key</tt>, and <tt>:foreign_key</tt> are ignored, as the association uses the
# source reflection. You can only use a <tt>:through</tt> query through a #has_one
# or #belongs_to association on the join model.
#
# If you are going to modify the association (rather than just read from it), then it is
# a good idea to set the <tt>:inverse_of</tt> option.
# [:source]
# Specifies the source association name used by #has_one <tt>:through</tt> queries.
# Only use it if the name cannot be inferred from the association.
@ -1484,8 +1486,7 @@ module ActiveRecord
# <tt>:autosave</tt> to <tt>true</tt>.
# [:inverse_of]
# Specifies the name of the #belongs_to association on the associated object
# that is the inverse of this #has_one association. Does not work in combination
# with <tt>:through</tt> or <tt>:as</tt> options.
# that is the inverse of this #has_one association.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
# [:required]
# When set to +true+, the association will also have its presence validated.
@ -1570,6 +1571,9 @@ module ActiveRecord
# association will use "person_id" as the default <tt>:foreign_key</tt>. Similarly,
# <tt>belongs_to :favorite_person, class_name: "Person"</tt> will use a foreign key
# of "favorite_person_id".
#
# If you are going to modify the association (rather than just read from it), then it is
# a good idea to set the <tt>:inverse_of</tt> option.
# [:foreign_type]
# Specify the column used to store the associated object's type, if this is a polymorphic
# association. By default this is guessed to be the name of the association with a "_type"
@ -1619,8 +1623,7 @@ module ActiveRecord
# +after_commit+ and +after_rollback+ callbacks are executed.
# [:inverse_of]
# Specifies the name of the #has_one or #has_many association on the associated
# object that is the inverse of this #belongs_to association. Does not work in
# combination with the <tt>:polymorphic</tt> options.
# object that is the inverse of this #belongs_to association.
# See ActiveRecord::Associations::ClassMethods's overview on Bi-directional associations for more detail.
# [:optional]
# When set to +true+, the association will not have its presence validated.
@ -1789,6 +1792,9 @@ module ActiveRecord
# of this class in lower-case and "_id" suffixed. So a Person class that makes
# a #has_and_belongs_to_many association to Project will use "person_id" as the
# default <tt>:foreign_key</tt>.
#
# If you are going to modify the association (rather than just read from it), then it is
# a good idea to set the <tt>:inverse_of</tt> option.
# [:association_foreign_key]
# Specify the foreign key used for the association on the receiving side of the association.
# By default this is guessed to be the name of the associated class in lower-case and "_id" suffixed.

26
guides/source/association_basics.md
View file

@ -735,12 +735,9 @@ a.first_name = 'David'
a.first_name == b.author.first_name # => true
```
Active Record supports automatic identification for most associations with standard names. However, Active Record will not automatically identify bi-directional associations that contain any of the following options:
Active Record supports automatic identification for most associations with standard names. However, Active Record will not automatically identify bi-directional associations that contain a scope or any of the following options:
* `:conditions`
* `:through`
* `:polymorphic`
* `:class_name`
* `:foreign_key`
For example, consider the following model declarations:
@ -787,12 +784,6 @@ a.first_name = 'David'
a.first_name == b.writer.first_name # => true
```
There are a few limitations to `:inverse_of` support:
* They do not work with `:through` associations.
* They do not work with `:polymorphic` associations.
* They do not work with `:as` associations.
Detailed Association Reference
------------------------------
@ -1012,7 +1003,7 @@ When we execute `@user.todos.create` then the `@todo` record will have its
##### `:inverse_of`
The `:inverse_of` option specifies the name of the `has_many` or `has_one` association that is the inverse of this association. Does not work in combination with the `:polymorphic` options.
The `:inverse_of` option specifies the name of the `has_many` or `has_one` association that is the inverse of this association.
```ruby
class Author < ApplicationRecord
@ -1066,7 +1057,8 @@ There may be times when you wish to customize the query used by `belongs_to`. Su
```ruby
class Book < ApplicationRecord
belongs_to :author, -> { where active: true },
dependent: :destroy
dependent: :destroy,
inverse_of: :books
end
```
@ -1082,8 +1074,8 @@ You can use any of the standard [querying methods](active_record_querying.html)
The `where` method lets you specify the conditions that the associated object must meet.
```ruby
class book < ApplicationRecord
belongs_to :author, -> { where active: true }
class Book < ApplicationRecord
belongs_to :author, -> { where active: true }, inverse_of: :books
end
```
@ -1299,7 +1291,7 @@ TIP: In any case, Rails will not create foreign key columns for you. You need to
##### `:inverse_of`
The `:inverse_of` option specifies the name of the `belongs_to` association that is the inverse of this association. Does not work in combination with the `:through` or `:as` options.
The `:inverse_of` option specifies the name of the `belongs_to` association that is the inverse of this association.
```ruby
class Supplier < ApplicationRecord
@ -1337,7 +1329,7 @@ There may be times when you wish to customize the query used by `has_one`. Such
```ruby
class Supplier < ApplicationRecord
has_one :account, -> { where active: true }
has_one :account, -> { where active: true }, inverse_of: :supplier
end
```
@ -1694,7 +1686,7 @@ TIP: In any case, Rails will not create foreign key columns for you. You need to
##### `:inverse_of`
The `:inverse_of` option specifies the name of the `belongs_to` association that is the inverse of this association. Does not work in combination with the `:through` or `:as` options.
The `:inverse_of` option specifies the name of the `belongs_to` association that is the inverse of this association.
```ruby
class Author < ApplicationRecord