[RAILS] How to update related models with accepts_nested_attributes_for

Thing you want to do

Using accepts_nested_attributes_for, we are also creating and updating related models at the same time.

There was a case where I wanted to update only the related model at the timing of creation.

How to do

https://github.com/rails/rails/issues/7256#issuecomment-93172189 It is a memo that I chewed for myself.

Foo (existing update)-> Bar (create)-> Baz (existing update) ・ Foo is updated ・ Create Bar ・ Baz updated I want to

In that case, just pass params as follows.

  foo: {
    id: "foo_id", =>Pass id to update foo
    bar_attributes: {
      baz_id: "baz_id", =>baz to update baz_id and
      baz_attributes: {
        id: "baz_id",  =>Pass the id.

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