From: Robert Klemme <shortcutter@...>
Date: 2008-09-09T22:05:09+09:00
Subject: Re: Hash custom sort? Overriding <=>? Help!

2008/9/8 Jarrett Green <jarrett@blinkmg.com>:
> David A. Black wrote:
>>
>> Sorting and grouping aren't the same thing, but if you want grouping
>> by the results of the name method, you would do:
>>
>>    @project_companies = @projects.group_by {|project| project.name }
>>
>>
>>
>
> Thanks for the response david! Unfortunately, I don't think this is what
> I was looking for. The key I need exists through an association.
>
> Calling project.name gives me the project's name, sure, and calling
> project.primary_company_id, gives me the foreign key id of a has_one
> relationship with Company. calling project.primary_company, through some
> rails magic gives me the entire object associated with that foreign key.
> I'd like that key to just be one parameter out of that relationship -
> the associated company's name, which was why I was asking if I could use
> @project_companies = @projects.group_by(&:primary_company.name). It
> seems to be an all or nothing. I can either have the foreign key
> integer, or the entire object, but not param from that object?

Why can't you do

@project_companies = @projects.group_by {|pr| pr.primary_company.name}

?

robert


-- 
use.inject do |as, often| as.you_can - without end