Wall

Initial steps of Wall creation
I am not sure if you understood what you doing here? does walls have content? as a string? 

We have been over this. But the wall should have many posts has you designed on the models above. so this migration could be only:

```ruby
class CreateWalls < ActiveRecord::Migration
  def change
    create_table :walls do |t|
      t.timestamps
    end
  end
end
```