On Monday, September 9, 2013 11:16:14 PM UTC+1, Brett Pontarelli wrote:
>
> Below is an example of the error I encountered in my project today and
> after a great deal of searching I realized the problem to be that the *
> _attributes needs to be an array! My first question is, is there a use
> for *_attributes={} and is there something I'm missing to make it work in
> that case? If not, then what *should* the behavior be? Should it be
> allowed and instead create one record (a letter for example)? Thanks.
>
> it should either be an array or a hash where the keys are indices e.g.
{'1' => {'test' => 'foo'}, '2' => {'test' => 'bar'}, ...}
The expected format is
documented:
http://apidock.com/rails/v3.2.13/ActiveRecord/NestedAttributes/assign_nested_attributes_for_collection_association
The keys in this top level hash are irrelevant
>
Fred
Setup a simple rails app:
>
> class Word < ActiveRecord::Base
> has_many :letters, dependent: :destroy
> accepts_nested_attributes_for :letters
> end
>
> class Letter < ActiveRecord::Base
> belongs_to :word
> end
>
> This works just fine (e.g. in the console):
>
> attrs = { 'letters_attributes' => [{ 'test' => '1' }] }
> Word.new attrs
>
> But this give an error:
>
> attrs = { 'letters_attributes' => { 'test' => '1' } }
> Word.new attrs
>
> and the output looks something like:
>
> TypeError: no implicit conversion of Symbol into Integer
> from /../active_record/nested_attributes.rb:452:in `[]'
> from /../active_record/nested_attributes.rb:452:in `block in
> assign_nested_attributes_for_collection_association'
> from /../active_record/nested_attributes.rb:452:in `map'
> from /../active_record/nested_attributes.rb:452:in
> `assign_nested_attributes_for_collection_association'
> from /../active_record/nested_attributes.rb:339:in `letters_attributes='
> from /../active_record/attribute_assignment.rb:42:in `public_send'
> from /../active_record/attribute_assignment.rb:42:in `_assign_attribute'
> from /../active_record/attribute_assignment.rb:53:in `block in
> assign_nested_parameter_attributes'
> from /../active_record/attribute_assignment.rb:53:in `each'
> from /../active_record/attribute_assignment.rb:53:in
> `assign_nested_parameter_attributes'
> from /../active_record/attribute_assignment.rb:33:in `assign_attributes'
> from /../active_record/core.rb:192:in `initialize'
> from /../active_record/inheritance.rb:27:in `new'
> from /../active_record/inheritance.rb:27:in `new'
>
>
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