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Edgar Gonzalez

2007-Sep-03 04:48 UTC

relationing has_many, belongs_to

Hello, i want to know if i am relationing fine, because i am having
problems,i have 2 models, one for members and other to relate some
members to this:

class Member < ActiveRecord::Base
    has_many :matrix, :foreign_key=>:parent
end

class Matrix < ActiveRecord::Base
  set_table_name :matrix
  set_primary_key :userid
  belongs_to :member, :foreign_key=>:userid
  acts_as_tree :foreign_key=>:parent
end

when i try to save a new member it says: undefined method `userid='' for
Matrix:Class and i think is because he wants to do find() first, but i
dont want it, because i am saving a new.

def create
    @member = Member.new(params[:member])
    @member.matrix.new
    @member.matrix.userid = @member.userid
    @member.matrix.parent = params[:parent]
....
end

is a relationating problem??
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rein.henrichs-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Sep-03 06:32 UTC

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Re: relationing has_many, belongs_to

userid cannot be both the primary key and a foreign key.

Rein

On Sep 2, 11:48 pm, Edgar Gonzalez
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Hello, i want to know if i am relationing fine, because i am having
> problems,i have 2 models, one for members and other to relate some
> members to this:
>
> class Member < ActiveRecord::Base
>     has_many :matrix, :foreign_key=>:parent
> end
>
> class Matrix < ActiveRecord::Base
>   set_table_name :matrix
>   set_primary_key :userid
>   belongs_to :member, :foreign_key=>:userid
>   acts_as_tree :foreign_key=>:parent
> end
>
> when i try to save a new member it says: undefined method
`userid='' for
> Matrix:Class and i think is because he wants to do find() first, but i
> dont want it, because i am saving a new.
>
> def create
>     @member = Member.new(params[:member])
>     @member.matrix.new
>     @member.matrix.userid = @member.userid
>     @member.matrix.parent = params[:parent]
> ....
> end
>
> is a relationating problem??
> --
> Posted viahttp://www.ruby-forum.com/.

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Edgar Gonzalez

2007-Sep-03 11:01 UTC

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Re: relationing has_many, belongs_to

Well the problem is, that the table schema is thus, because in some case 
i would rather use the rails convention an use member_id, in case of 
userid, but i have to work with the actual table.

but my problem i dont think that is with this.

by the way, thanks Rein
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Thorsten

2007-Sep-03 13:22 UTC

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Re: relationing has_many, belongs_to

@member.matrix.new returns a new matrix object. you have to assign it
to a variable:

def create
    @member = Member.new(params[:member])
    @new_matrix = @member.matrix.new
    @new_matrix.userid = @member.userid
    @new_matrix.parent = params[:parent]
....
end

about foreign keys: in the has_many, you define parent as the foreign
key, in the belongs_to, you define userid as foreign key. but it has
to be the same on both sides, otherwise it''s no proper relation,
legacy Database or not.
You tell the Member model that is has many Matrix'' associated through
the parent column in the matrix table, but you tell the Matric Model
that it belongs to a Member associated by the userid column in the
matrix table ... it should say "parent" here to, because the table on
the has_many side doesn''t have a foreign key, only the belongs_ to
side

On 3 Sep., 13:01, Edgar Gonzalez
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> Well the problem is, that the table schema is thus, because in some case
> i would rather use the rails convention an use member_id, in case of
> userid, but i have to work with the actual table.
>
> but my problem i dont think that is with this.
>
> by the way, thanks Rein
> --
> Posted viahttp://www.ruby-forum.com/.

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Edgar Gonzalez

2007-Sep-03 17:53 UTC

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Re: relationing has_many, belongs_to

Thanks  Thorsten,

I got first part, but about the correct relation, i didn''t understood 
right, could you explain me better?


Thanks
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Edgar Gonzalez

2007-Sep-03 18:31 UTC

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Re: relationing has_many, belongs_to

i still got the problem when i try to save through has_many

def create
   @member = Member.new(params[:member])
   @new_matrix = Matrix.new
   @new_matrix.parent = params[:parent]

    respond_to do |format|
      if @member.save
         @new_matrix.userid = @member.id
         @new_matrix.save
       .....
      end
    end
  end

undefined method `userid='' for #<Matrix:0x48a4450>

but there is a column called userid! :S

i am consufused now
-- 
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Rein Henrichs

2007-Sep-03 18:44 UTC

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Re: relationing has_many, belongs_to

You''ve defined userid as the primary key, which makes it accessable as
id (ie @matrix.id) rather than userid. The problem here, though, is
manifold:

Rails expects your database to be sane, which includes an id column
that is a unique auto-incrementing integer.

Using it as a foreign key means that you''ll have to *set* the primary
key of the record, which is a huge no-no in both rails and database
design and violates the auto-incrementing requirement.

Using is as a foreign key also implies that two records could share
the same foreign key, and therefore the same primary key, which
violates the unique requirement.

Rails can work with most legacy databases provided that they''re
relatively sane. Using a primary key as a foreign key is most
definitely insane and I doubt you''d make that table work properly with
or without rails.

Rein

On Sep 3, 1:31 pm, Edgar Gonzalez
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> i still got the problem when i try to save through has_many
>
> def create
>    @member = Member.new(params[:member])
>    @new_matrix = Matrix.new
>    @new_matrix.parent = params[:parent]
>
>     respond_to do |format|
>       if @member.save
>          @new_matrix.userid = @member.id
>          @new_matrix.save
>        .....
>       end
>     end
>   end
>
> undefined method `userid='' for #<Matrix:0x48a4450>
>
> but there is a column called userid! :S
>
> i am consufused now
> --
> Posted viahttp://www.ruby-forum.com/.

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Edgar Gonzalez

2007-Sep-03 20:40 UTC

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Re: relationing has_many, belongs_to

Thanks a lot Rein, the problem is that it was a old system and now i am 
trying to move on rails.

now i got:

class Matrix < ActiveRecord::Base
  set_table_name :matrix
  belongs_to :member, :foreign_key=>:userid
  acts_as_tree :foreign_key=>:parent

attr_writer :name
attr_writer :city
attr_writer :address
attr_writer :identification
attr_writer :phone
attr_writer :sponsor
attr_writer :email

end

i have put all these ''att_r_writer'' because this:

 def create
   @member = Member.new(params[:member])
   @new_matrix = Matrix.new
   @new_matrix.parent = params[:member]   <<<<--- here is my problem
    respond_to do |format|
      if @member.save
         @new_matrix.userid = @member.id
         @new_matrix.save
     ......
    end
  end

how can i access to the params[:parent]??, because tis param is inside 
the params[:member]

Request

Parameters: {"commit"=>"Create",
"member"=>{"name"=>"Edgar /8",
"city"=>"sdfsdf",
"identification"=>"s44546",
"phone"=>"N/A",
"sponsor"=>"0", "address"=>"sd",
"email"=>"sdf-KdrC/hUTNrA@public.gmane.org",
"parent"=>"5"}}

i tried params[:member][:parent], params[:parent]
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