Rails - Find By with 2 fields?

Question

I have the following in a controller

def update
    @permission = Permission.find_by_user_id(params[:user_id])

But I want it to also find by a

Answer 1

Rails 3 way with scopes:

scope :by_user_id_and_project_id, lambda {|user_id,project_id| 
    where(:user_id=>user_id).where(:project_id=>project_id])
}

And then you can use it like:

@permission = Permission.by_user_id_and_project_id(params[:user_id],params[:project_id])