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| author | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2018-07-18 16:31:42 -0400 |
|---|---|---|
| committer | Rafael Mendonça França <rafaelmfranca@gmail.com> | 2018-07-18 16:31:42 -0400 |
| commit | dc1c679d897281e92eef9f7540e540eb6334f94c (patch) | |
| tree | 134b8282cddc6cf7620c0ee2d82b28cb67172aea /guides/source | |
| parent | 5df23a04a31e95beb9a5728851345a68b3bca2ac (diff) | |
| download | rails-dc1c679d897281e92eef9f7540e540eb6334f94c.tar.gz rails-dc1c679d897281e92eef9f7540e540eb6334f94c.tar.bz2 rails-dc1c679d897281e92eef9f7540e540eb6334f94c.zip | |
Revert "Merge pull request #33385 from lanzhiheng/add-example-for-has-and-belongs-to-many-association"
This reverts commit 3c8c410012e34709f3fdfe5b6a571353b20d0c56, reversing
changes made to daee94da99605d89854660b63d98e4c1dc9a979d.
We have this information below in the reference section for
has_and_belongs_to_many.
Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/association_basics.md | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/guides/source/association_basics.md b/guides/source/association_basics.md index e13f4b6aaf..e7408b5a7f 100644 --- a/guides/source/association_basics.md +++ b/guides/source/association_basics.md @@ -365,22 +365,6 @@ class CreateAssembliesAndParts < ActiveRecord::Migration[5.0] end ``` -As you can see we don't create the relevant model for `assemblies_parts` table, So We can't create the many-to-many record like this - -``` ruby -AssemblyPart.create(assembly: @assembly, part: @part) # => NameError: uninitialized constant AssemblyPart -``` - -If you want to create the relevant many-to-many record, you can use the below code - -``` ruby -@assembly.parts << @part -# Or -@part.assemblies << @assembly -``` - -They are equivalent. - ### Choosing Between `belongs_to` and `has_one` If you want to set up a one-to-one relationship between two models, you'll need to add `belongs_to` to one, and `has_one` to the other. How do you know which is which? |