Lazy loading issue (I think) - what's up with this ?

rubyonrails-talk
1

I have three models: (1) Mood (2) User (3) Mymood

Mymood belongs_to mood Mymood belongs_to user

User has_many mymoods

I have a function in User, like this:

def moods   if mymoods.empty?        else     mymoods.collect{|mm| mm.mood}   end end

In Rails2, User.first.moods returns an array of moods (or an empty array where there are none)

In Rails3, I get a big old error: uninitialized constant Mymood::Mood

I'm guessing it's something to do with lazy loading, because if I call (in the console) User.first.mymoods then   User.first.moods it all works as it should, but if I just call on its own:   User.first.moods I get the error above

Any guidance gratefully received!

2

Look at things in the debugger, but the likelihood is that you're trying to operate on what you think is an array of records, but is just a query.

my_moods = MyMood.where("my criteria")

my_moods.collect.... Error

then my_moods.all.collect.... and you're good to go.

or my_moods = MyMood.where("my criteria").all and my_moods.collect...

3

Thanks, Ray. Per your suggestion, this fixed it:

  def moods     ms=Mymood.where('user_id=?',user_id)     if ms.empty?            else       ms.collect{|mm| mm.mood}     end   end

But it seems strange to have to write another query in the middle of a model. I'd have thought that the "has_many :mymoods" in the user model would have been enough.

Whatever. It's working now. Thanks for your help!

4

Of course, as I just discovered, if I'd put in

has_many :moods, :through=>:mymoods

that would have worked too :slight_smile: