Ruby on Rails

On Tuesday, February 26, 2013 7:35:23 PM UTC, xop wrote:
> When using "attributes=" for an object with a accepts_nested_attributes_for a model
> that has a has_many relationship will cause the has_many array to be appended-to
> instead of being replaced as would be expected by a straight assignment operation.
>
>
attributes= has always behaved like that ( the name is bad - it's not really an accessor at all. The newer name is assign_attributes)

Fred

> See this example:
>
>
> class Member < ActiveRecord::Base
>   has_many :posts
>   accepts_nested_attributes_for :posts
> end
>
>
> class Post < ActiveRecord::Base
>   belongs_to :member
> end
>
>
> m=Member.new
> p={:name => 'joe', :posts_attributes => [{:title=>'t1'},{:title=>'t2'}]}
>
>
> m.attributes = p
> m.posts.size ----> 2
>
>
> m.attributes = p
> m.posts.size ----> 4
>
>
> Is this a feature or a bug?  If it is a feature, how is it supposed to be used?

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