Activerecord Relationships: Can children access parents?

rubyonrails-talk
1

I am having trouble when using a child to reference the parent object in a relationship, it always claims the parent is nil. I could easily be doing something wrong as this is all hazy but I thought I'd ask if anyone could see anything obvious:

I have two databases:

rulesets id name

races id name ruleset_id

A race specifies it's ruleset so, a ruleset can have many races, but each race will have only 1 ruleset. I have specified a foreign key relationship without a constraint (using mysql "foreign key (ruleset_id) references rulesets (id)") but my version of MySQL doesn't even enforce foreign keys so that shouldn't help much. In the models I have:

class Ruleset < ActiveRecord::Base   has_many :races ...

class Race < ActiveRecord::Base   belongs_to :rulesets ...

Then in the controller I have:

@races = Race.find( :all )

And finally in the view:

<% @races.each do |r| %>   ...   <%= @r.ruleset.name %>   ...

And it complains that ruleset is not a valid method for races. The book I have on Ruby only talks about doing this sort of access in one direction (i.e. ruleset.races.<attribute> not races.ruleset.<attribute>) so I'm not even sure if it's possible to have a child accessing the values of it's parent. But if it is, what am I doing wrong here?

Thanks in advance!!

Chris

2

I just restarted and that did not solve the problem. I'm using Webbrick and I'm in development mode, so I'm hoping everything gets reloaded each run... but nevertheless, it was worth a shot.

Chris

3

class Race < ActiveRecord::Base   belongs_to :rulesets

I think this should be singular: belongs_to :rulesets

4

This worked. I changed both references to singular and it works now. Funny, my Rails programming text's examples show using the plural form of the DB. I even checked that to make sure it was plural and not singular.

Anyway,

belongs_to :ruleset has_many :races

...did the trick. Thanks so much!

Chris