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
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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