From: Ron Fox <fox@...>
Date: 2008-05-29T20:29:55+09:00
Subject: Re: Merge collections of objects

Unless this is a toy project, it will be important to think about what 
is it that makes two employees, one in companyA and one in companyB 
'duplicates'...and what you really want to do in that case as the 
record information related to the emplyees may be different between 
the companies...all this is interesting business logic.. not a ruby 
question however.

RF

John Butler wrote:
> Hi,
> 
> I wonder if there is a quick way to do this.
> 
> companyA has 2 employees "a", "b"
> 
> companyB has 3 employees "a", "b", "c"
> 
> I basically want to merge companyA employess with companyB employees so
> when i look at companyA the employees will equal "a", "b", "c"
> 
> i know i could do something like companyA.employees = companyB.employees
> but this would just overwrite companyA employees so if companyA had more
> employees than companyB i would lose the employees companyA had that
> companyB didnt.
> 
> I think companyA.employees << companyB.employees would just mash them
> together and give me duplicates.
> 
> The only other way i can think off is a nasty double loop that compares
> each object 1 by 1 and then starts again going through the process.
> 
> It would also be nice if the employees for companyB were removed but i
> could do that separately.
> 
> JB