Single language field with accepts_nested_attributes_for not stored

[phlegx]

Hi!

I use the latest version of the gem. I have a view with three text fields, one for every language. If I want to submit the form where one text field (e.g. language field English) is filled out and the other two are empty, then the changes are not stored in database. I have checked the params and all three fields are present in the params. English field has a content the other two are empty.

Project has many tasks as nested fields. The model Project accepts nested attributes for tasks.

# controller
def update
    @project = Project.find(params[:id])
    @project.assign_attributes(params)
    ...
    @project.save
end

My Task model:

  ...
  translates :description
  globalize_accessors
  ...

If I delete the rows in table task_translations related to the tasks and re-submit the form, all works fine. Any idea?

[tommyku]

I encountered this when I set reject_if: name_is_blank as a parameter to accepts_nested_attributes_for

[yihyang]

Hi there, my reply seems to be 2 years late. But I would like to share my experience on what happened on my implementation that caused accepts_nested_attributes_for to not work.

Imagine the relation of a Product has many Promotion.

I have implemented a .each method on the promotions at the Product model's before_save. Which caused it to delegate to ActiveRecord's CollectionProxy method:

https://github.com/rails/rails/blob/v5.1.6.2/activerecord/lib/active_record/relation/delegation.rb#L39-L42

and therefore caused globalize to assign the attributes twice and somehow it assigned the old value to the dirty attribute on the second assignment.

There are 2 solutions for me:

1. Execute @product.update twice (Hackish, but somehow it works)
2. Remove the .each method on before_save

Hope this helps