Rails 4: fields_for in fields_for

ruby-on-rails ruby-on-rails-4 form-for fields-for nested-form-for

Try switching:

<%= f.fields_for :grandfather do |fff| %>

to:

<%= ff.fields_for :grandfather do |fff| %>

And switching:

params.require(:child).permit(:name, father_attributes:[:name], grandfather_attributes:[:name])

To:

params.require(:child).permit(:name, father_attributes:[:name, grandfather_attributes:[:name]])

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