I have the model Game that represents games. Each game can have related games, so I have another model Related Games so Game.related_games holds the related games for that game.
The related_games model structure is [game_id, name] where game_id is the game's id the relation is linked to, and name is the name of the game that is related to that game.
Now when I display the erb like this:
f.collection_check_boxes :related_games, Game.all, :id, :name The related games will not be selected, like its empty, while the game has related games.
Why does it happen?
4 Answers
Answers 1
I think your models are incorrect (or I did not understand your use case). Your RelatedGame model has a game_id and a name. What does this name represent? If this name is the one for the game_id, it is unnecessary (you have the name through the link game_id). If it is the name of another game, you really should have another game_id.
I believe your models should be:
Model Similarity (or another name, this is your RelatedGame, with some changes)
class Similarity < ApplicationRecord belongs_to :game1, :foreign_key => 'game1_id', :class_name => "Game" belongs_to :game2, :foreign_key => 'game2_id', :class_name => "Game" end Model Game
class Game < ApplicationRecord has_many :similarities1, :class_name => "Similarity", :foreign_key => "game1_id" has_many :similarities2, :class_name => "Similarity", :foreign_key => "game2_id" has_many :similar_games, :through => :similarities1, source: "Game" has_many :inverse_similar_games, :through => :similarities2, source: "Game" def all_similar_games (similar_games + inverse_similar_games).uniq end end Games Controller
def edit # The game to edit @game = Game.find_by(id: params[:id]) # The relation table (similarity) where this game is the game1 @related = @game.similarities1 # The games related to this game (all games linked by game2 in the similarities relation, where this game is game1) @similar_games = @game.similar_games # All games related to this one through similarity, whether through game1 or game2 @all_similar_games = @game.all_similar_games end In the view:
<h1>@game.name</h1> <% form_for @game do |f| %> <%= f.input_field :name %> <%= f.collection_check_boxes :similar_game_ids, Game.all, :id, :name) %> <% end %> Answers 2
You should use :related_game_ids instead of :related_games.
f.collection_check_boxes :related_game_ids, Game.all, :id, :name
Don't forget to permit :related_game_ids in your controller.
Answers 3
I don't know what is your model look like if your relations ok and model formatted properly then
Try the following
<%= f.collection_check_boxes :game_ids, Game.all, :id, :name do |cb| %> <% cb.label(class: "checkbox-inline input_checkbox") {cb.check_box(class: "checkbox") + cb.text } %> <% end %> and the controller strong parameters use like below
game_ids: [] Hope it helps
Answers 4
Did you put in your controller that related_games accepts a hash of ids?
game_controller.rb
private def game_params params.require(:game).permit( //fields_of_game, related_game_ids: [] ) end in you form
games/_form.html.erb
<%= hidden_field_tag "game[related_game_ids][]", nil %> <% Related_Games.all.each do |r_games| %> <%= check_box_tag "game[related_game_ids][]", r_games.id, @game.related_game_id.include?(r_game.id), id: dom_id(r_game) %> <%= label_tag dom_id(r_game), r_game.name %> <br> <% end %> in your model game.rb did you put the association? Something like this:
accepts_nested_attributes_for :related_games def related_games_attributes=(related_game_attributes) related_game_attributes.values.each do |related_game_attribute| related_game = Related_Games.find_or_create_by(related_game) self.related_game << related_game end end 
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