How to get the reference?

Rails
1

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| %>

<%= user.name %>

<%= user.gender_id %>

<% end %>

the result is output number, but I need to gendername

p.s.
so I tried:

<%= user.gender.gender_name %>

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

2

On 14 June 2015 at 08:27, Zlodiak Z. [email protected] wrote:

…
so I tried:

<%= user.gender.gender_name %>

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

<%= user.gender.gender_name if user.gender
%>

Colin

3

thanks!

4

On 14 June 2015 at 18:55, Elizabeth McGurty [email protected] 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

5

Just wondering why you don’t validate the presence/absence of
gender_name
on creation of a new record…

6

Yeah, I state corrected, but my point remains…