Re: [Rails] Auto generate models on creation of other models in Ruby on Rails

On Fri, May 10, 2013 at 5:09 AM, Colin Law <clanlaw@googlemail.com> wrote:

On 9 May 2013 22:41, Jessica Lu <loppilop@gmail.com> wrote:
> I have a model called Video that has many statuses. I want to create a
> status of each kind and add it to @video.statuses in the def create of
> VideosController.
>
> In VideosController, I have:
>
>  def create
>     @video = Video.new(params[:video])
>     Kind.all.each do |f|
>       @video.statuses.new(:kind =>f, :kind_id=>f.id,:comment =>"",
> :time_comp => nil, :completed =>false, :video_id =>@video.id)

You don't need ":video_id => @video.id". Replace this line with that:

@video.statuses.build(:kind =>f, :kind_id=>f.id,:comment =>"", :time_comp => nil, :completed =>false)
build is an alias to new, you can look here[0]

Then when you call @video.save, all statuses will create too, with @video.id.

In your code @video is not saved when you call to statuses.new, then @video.id is nil, that's why of your error

[0] http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

 

--

Matt's 

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