CODEWITHSUNDEEP
ruby-on-railsrubyactiverecord
bpruitt-goddard
bpruitt-goddard

Reputation: 3324

ActiveRecord has_many association null

I have 3 models that are interacting:

On the associated Session index, I am trying to display the list of session players for a given session, and each session player's player name -- session_player.player.name. Running the Rails page provides me with the proper data, but during testing I am having an issue.

In the index.html.erb page I am using the following loop:

<% @sessions.each do |session| %>
  <% session.session_player.each do |player| %>
      <div><%= player.player.name %></div>
  <% end %>
<% end %>

When the code is executed during test, it is getting a null exception on player.player, however I can debug it and it has a value set up properly for player.player_id leading me to believe there is something wrong with my model code or some strange caching going on during the test.

Session model

class Session < ActiveRecord::Base
  has_many :session_player
  has_many :player,  through: :session_player
end

SessionPlayer model

class SessionPlayer < ActiveRecord::Base
  belongs_to :player
  belongs_to :session
end

Player model

class Player < ActiveRecord::Base
  has_many :session_player
  has_many :session, through: :session_player
end

The test and fixture data are both boilerplate created via RubyMine (as were the controllers and models), but I can post those if need be.

Upvotes: 0

Views: 247

Answers (1)

Rajdeep Singh
Rajdeep Singh

Reputation: 17834

I think the problem is that you used session_player, but it should be session_players, use this line instead

<% session.session_players.each do |player| %>

And in your model, since you are using has_many, you should use pluralized form of model name

has_many :session_players

Upvotes: 3

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