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Hello, I developed an app with postgres DB but want to change the DB to sqlite3. I changed the database adapter in the database.yml file. When I run the migration most of it was successful but add_column was throwing an error "Cannot add a NOT NULL column with default value NULL: ALTER TABLE "rates" ADD "customer_id" integer NOT NULL". I made the modification and

Hi, My system has been encounter this problem, and I couldn''t find solution after debugging. My scenario is stated below: class user has_many :posts has_many :comments end class post belongs_to :user has_many :comments, :as => :commentable end class comment belongs_to :post belongs_to :user end For this case, I am trying to retrieve each post''s comment