Noob Q: How to access a belongs_to object

rubyonrails-talk
1

Sorry for the simplicity on this. I hope this makes for a quick response.

I have two classes:

class UserProfile < ActiveRecord::Base belongs_to :UserGroup end

class UserGroup < ActiveRecord::Base

has_many :UserProfiles

end

I want to display the UserGroup.Name for an UserProfile instance.

This snippet returns the correct User_Group id:

@user_profile.User_Group_id

This code seemed the most logical to me:

@user_profile.UserGroup.Name

but I get this error:

You have a nil object when you didn't expect it!
The error occurred while evaluating nil.Name

What should the call be?

Thanks in advance!
2

FYI, I figured this out. I shouldn't have been using capital letters in my classes. But now, I've run into a different problem.

These two classes: class UserProfile < ActiveRecord::Base   belongs_to :UserGroup end

class UserGroup < ActiveRecord::Base   has_many :UserProfiles end

become: class UserProfile < ActiveRecord::Base   belongs_to :usergroup end

class UserGroup < ActiveRecord::Base   has_many :userprofiles end

I'm not getting the error below when I make this call:

<% for user_profile in @user_profiles %> ...     <td><%=h user_profile.usergroup.Name %></td> ...

========Error====== uninitialized constant UserProfile::Usergroup

Thoughts?

3

FYI, I figured this out. I shouldn't have been using capital letters in my classes. But now, I've run into a different problem.

These two classes: class UserProfile < ActiveRecord::Base   belongs_to :UserGroup end

class UserGroup < ActiveRecord::Base   has_many :UserProfiles end

become: class UserProfile < ActiveRecord::Base   belongs_to :usergroup

Should be 'user_group'

end

class UserGroup < ActiveRecord::Base   has_many :userprofiles

and 'user_profiles'

Multiple words in the class name correspond to multiple words in the table and relationship names. Here's another tip to preserve sanity: Follow the dictionary when deciding whether a name is one word or multiple words. This rule tells you to call the class 'UserGroup' and the table 'user_groups' instead of 'Usergroup' and 'usergroups'.