how to get the reference?

rubyonrails-talk
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| %>     <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

2

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

3

thanks!

4

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