Keep params after render Ruby on Rails

Question

I have a Project that belongs to User. In my user view I have a link to add a new project, with the parameter for the user I want to add the project to.

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Answer 1

You shouldn't use params[:id] to assign value to this form field. Instead, add this to your #new action in controller:

def new
  @project = Project.new(user_id: params[:id])
end

and then just write this in your form:

<%= f.hidden_field :user_id %>

Because @project was defined in your #new and #create actions and because it already contains a Project instance with a user_id assigned to it, the value would automatically be added to this field.