Set attributes when automatically building has_one child model

Question

I'm attempting to automatically build a child model when its parent is created, as noted in this post. Say I have two models Person has_one :folder and I would like to create a folder when the person creates To do this I go into the Person model and (from the example above) do the following.

has_one :folder
before_create :build_default_folder

private
def build_default_folder
  build_folder
  true
end

This makes sense, but say Profile had some attributes that I would like to set an attribute for Folder based on the Person's attributes. Like if the person has :person_name what should I do to set :folder_name as "[person_name]'s_Folder"?

Thanks for any suggestions.

Roman Kiselenko · Accepted Answer · 2016-05-14T10:58:53.740

1

You able to access a parent attribute from the child model:

class Profile < AR::Base
    has_one :folder
    before_create :build_default_folder

    private
    def build_default_folder
      build_folder(folder_name: person_name)
      true
    end
end

Read the documentation for Active Record Associations.

edited May 14 '16 at 10:58

answered May 14 '16 at 10:55

Roman Kiselenko

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Thanks for the response. If this was in the person model wouldn't that be `build_folder(folder_name: self.person_name)`? Or am I mistaken? – neanderslob May 14 '16 at 10:57
1

yeah, my bad, you can use both`self.person_name` and `person_name`. – Roman Kiselenko May 14 '16 at 10:59

Set attributes when automatically building has_one child model

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