how to get the reference?

[Zlodiak Zlodiak]

please help solve the problem.

There is a table users:
id :integer, autoincrement
name :string
gender_id :integer

There is a table genders:
id :integer, autoincrement
gender_name :string

model User:
class User < ActiveRecord::Base
belongs_to :gender
end

model Gender:
class Gender < ActiveRecord::Base
has_many :users
end

I need the gendername. I try to do so:
<% @users.each do |user| %>
<div class="col-xs-6"><%= user.name %></div>
<div class="col-xs-2"><%= user.gender_id %></div>
<% end %>

the result is output number, but I need to gendername




p.s.
so I tried:
<div class="col-xs-2"><%= user.gender.gender_name %></div>

in this case receives the following error message:
undefined method `gender_name' for nil:NilClass

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[Colin Law]

On 14 June 2015 at 08:27, Zlodiak Zlodiak <li...@ruby-forum.com> wrote:
> ...

> so I tried:
> <div class="col-xs-2"><%= user.gender.gender_name %></div>
>
> in this case receives the following error message:
> undefined method `gender_name' for nil:NilClass

One of your users does not have a gender associated, so user.gender is nil
try <div class="col-xs-2"><%= user.gender.gender_name if user.gender %></div>

Colin

[Zlodiak Zlodiak]

thanks!

[Colin Law]

On 14 June 2015 at 18:55, Elizabeth McGurty <emcg...@gmail.com> wrote:
> Just wondering why you don't validate the presence/absence of gender_name on
> creation of a new record...

I think it is not gender_name that is missing, but the gender object itself.

Colin

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