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I have a Project object whose only parameter(besides :id) is :project_name.
The child of that object is ProjectDescription object whose parameters are :project_id and :description. How to code a form wich creates a project with corresponding description without Rails giving out any errors?
As Castilho commented, it sounds like you could refactor your database schema and not have to worry about this, but…
What you’re looking for is called a nested attributes form:
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html
Ryan Bates did a great screencast on this topic:
http://railscasts.com/episodes/196-nested-model-form-part-1