On Sep 9, 2013, at 5:16 PM, Brett Pontarelli <[email protected]> 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.
>
> Setup a simple rails app:
>
> class Word < ActiveRecord::Base
> has_many :letters, dependent: :destroy
Since you told it there would be many letters in the word, it only seems to
make sense that 'letters_attributes' would an Array, even if it only has one
item in it.
> 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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