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| -rw-r--r-- | guides/source/association_basics.md | 29 |
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diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md index e076f10ece..10538eff0f 100644 --- a/guides/source/association_basics.md +++ b/guides/source/association_basics.md @@ -1305,6 +1305,21 @@ The `:source` option specifies the source association name for a `has_one :throu The `:source_type` option specifies the source association type for a `has_one :through` association that proceeds through a polymorphic association. +```ruby +class Book < ApplicationRecord + has_one :format, polymorphic: true + has_one :dust_jacket, through: :format, source: :dust_jacket, source_type: "Hardback" +end + +class Paperback < ApplicationRecord; end + +class Hardback < ApplicationRecord + has_one :dust_jacket +end + +class DustJacket < ApplicationRecord; end +``` + ##### `:through` The `:through` option specifies a join model through which to perform the query. `has_one :through` associations were discussed in detail [earlier in this guide](#the-has-one-through-association). @@ -1717,6 +1732,20 @@ The `:source` option specifies the source association name for a `has_many :thro The `:source_type` option specifies the source association type for a `has_many :through` association that proceeds through a polymorphic association. +```ruby +class Author < ApplicationRecord + has_many :books + has_many :paperbacks, through: :books, source: :format, source_type: "Paperback" +end + +class Book < ApplicationRecord + has_one :format, polymorphic: true +end + +class Hardback < ApplicationRecord; end +class Paperback < ApplicationRecord; end +``` + ##### `:through` The `:through` option specifies a join model through which to perform the query. `has_many :through` associations provide a way to implement many-to-many relationships, as discussed [earlier in this guide](#the-has-many-through-association). |