Why is Object nil?

rubyonrails-talk
1

I'm receiving the

"Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id"

Error Message, when my controller tries to get an object's id.

In my page users can register, login, create new game entries, rate them and leave a review.

the create method in the ratings controller is the exact same as in the review controller. (with different names of course)

def create         @game = Game.find_by_id(params[:game_id])         @rating = Rating.new(params[:rating])         @rating.game_id = @game.id         @rating.user_id = current_user.id end

Giving a rating works perfectly, but assigning the game.id to @review.game_id causes me the error...

but my relations are set, what can possibly be wrong? why is the game object not nil when trying to create a rating, but nil when I want to create a review?

2

I'm receiving the

"Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id"

Error Message, when my controller tries to get an object's id.

In my page users can register, login, create new game entries, rate them and leave a review.

the create method in the ratings controller is the exact same as in the review controller. (with different names of course)

def create         @game = Game.find_by_id(params[:game_id])         @rating = Rating.new(params[:rating])         @rating.game_id = @game.id         @rating.user_id = current_user.id end

Giving a rating works perfectly, but assigning the game.id to @review.game_id causes me the error...

The error is saying that @game is nil. Look in development.log when the method is called to see what params[:game_id] is set to. If you still can't see it then put some print statements in the method to print the value of params[:game_id] and to show whether @game is nil.

Also have a look at the Rails Guide on debugging which will show you techniques that you can use to debug your code.

Colin

3

Maybe I need an intersection table joining Reviews and games?

4

Maybe I need an intersection table joining Reviews and games?

Is that in answer to my post? If so it does seem to address my points. I don't see what the reviews table has got to do with your problem as seems to be purely an issue of looking up a game id in the database.

Colin