Question

I have done simple Rails finds for two tables, but now find that with a 4 table query I am not making good progress. All tables are connected with keys and are basically:

• User (has many)
• Phones (has many)
• Campaigns (has many)
• Calls

I just want to count the total number of calls a specific user has and the total number of calls for a specific campaign. I could also add user-id to Campaigns and Calls but for some reason I think that cheating or a bad idea. I just don’t know.

Answer 1

Rails 3:

Total number of calls a specific user has:

@user.phones.joins(:campaigns => :calls).count

Total number of calls for a specific campaign:

@user.phones.joins(:campaigns => :calls).where('campaigns.id' => @campaign.id).count