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From: Colin Law <clan...@googlemail.com>
Date: Thu, 12 Apr 2012 20:54:57 +0100
Message-ID: <CAL=0gLvjgA-E4=8aAhAFU9EVmnZQcFc6pQ9wkdaVp80ggG7...@mail.gmail.com>
Subject: Re: [Rails] model issues with ruby on rails 3
To: rubyonrails-talk@googlegroups.com
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On 12 April 2012 16:27, amvis <vgrkrish...@gmail.com> wrote:
>
>
> On Thursday, 12 April 2012 10:54:35 UTC-4, Colin Law wrote:>
>>
>> > =C2=A0=C2=A0=C2=A0 @user =3D User.find_by_user_name(user_name)
>> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 if !...@user.business_admins.nil?
>> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 put=
s "Am here"
>> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 @business=
_admin =3D @user.business_admins[0]
>> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 end
>> > class User < ActiveRecord::Base
>> > =C2=A0 has_many :business_admins
>> > end
>> >
>> > class BusinessAdmin < ActiveRecord::Base
>> > =C2=A0 belongs_to :user
>> > end
>> >
>> > Here what i am trying, I am using Mozilla rest-client, basically here
>> > the
>> > user_name found in the User table, But i didn't put that id in the
>> > BusinessAdmin, So what the problem is=C2=A0 when i run the code, this =
if
>> > !...@user.business_admins.nil? will return true, because am getting this
>> > "Am
>> > here"
>>
>> >I am not sure what you are saying. =C2=A0If you have user has_many
>> >business_admins then @user.business_admins will never be nil. =C2=A0It =
may
>> >be an empty array however. =C2=A0Perhaps you should be testing for the
>> >array empty rather than nil.
>
>>Colin
>
> Basically, the BusinessAdmin doesn't have that=C2=A0 use_name's id, then =
why this
> checking happned?

First what relationships have you got between the models (has_many,
belongs_to or whatever)?

As I said last time, if user has_many business_admins then
@user.business_admins will always (effectively) be an array, which may
be empty.  It will never be nil.

By the way, you sent your last email to me instead of to the list.
Please make sure you reply to the list.

Colin


>
> if !...@user.business_admins.nil?
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
puts "Am here"
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 @busin=
ess_admin =3D @user.business_admins[0]
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 end
>
>
> Thank you
> vishnu
>