Rails - Apr 2005 - Problem with my many-to-many relationship

Hello everyone,

this is the first time I''ve built a Rails application that has a 
many-to-many relationship, and I''m having a bit of trouble with a
method.
The application is one where computer technician can enter jobs, update 
them, etc. I have a list of jobs already (entered manually with CocoaMySQL) 
and now I need to update a job with Rails. A technician can have many jobs 
and a job can have many technicians, so I made the appropriate middle table. 
I''m gonna post some code to help you help me. 

The model code:

class Job < ActiveRecord::Base
belongs_to :category
belongs_to :priority
has_and_belongs_to_many :technician
end

class Technician < ActiveRecord::Base
has_and_belongs_to_many :job

def full_name
last_name + ", " + first_name
end
end



The code in my controller looks like this:

# Save a modified job
def save
job = Job.find(@params["job"]["id"])
job.attributes = @params["job"]
job.technician = Technician.find(@params["techs"])
if job.save
redirect_to "list"
else
render_text "Error!"
end
end

This doesn''t err, but when I go back to the list, if I added or removed
a
technician from a job, it is not taken into account, the thing is just like 
before. I tried it manually with script/console and the job goes back to its 
old technicians after I call job.save. 

Thanks for your help,

Vincent.

-- 
Vincent Foley-Bourgon
Blog: http://www.livejournal.com/~gnuvince
World.run while (6 * 9 == 42)


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>  
>  class Job < ActiveRecord::Base
>    belongs_to :category
>    belongs_to :priority
>    has_and_belongs_to_many :technicians # <-- plural
>  end
>  
>  class Technician < ActiveRecord::Base
>    has_and_belongs_to_many :jobs # <-- plural
I don''t think Rails is figuring out how to "classify" (i.e.
it tries
to singularize and then camelize) the symbols you''re passing in.  The
correct form is to use the plural (like it sounds in English) when
using has_and_belongs_to_many (things).

Duane Johnson
(canadaduane)

On 11.4.2005, at 21:31, Vincent Foley wrote:
>
>    # Save a modified job
>    def save
>      job =  Job.find(@params["job"]["id"])
>      job.attributes = @params["job"]
>      job.technician = Technician.find(@params["techs"])
This doesn''t sound correct in a habtm context. job.technicians is an 
array, so I think you should be doing something like job.technicians << 
Technician.find(@params["techs"]) instead.

I mean, there is no one specific job.technician, right?

//jarkko


--
Jarkko Laine
http://jlaine.net
http://odesign.fi


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