Rails Nested Attributes 3 level depth

Question

I have the models series seasons and episodes. From within series/new form I want to create a series, season and episode all together. I'm reading Rails Routing and Nested Forms guides but I don't know what I'm doing wrong as the guide doesn't cover a 3 level depth. When using the nested form, Rails is only inserting the Series and Season values but not the Episode values.

Is my approach even correct? I'd appreciate any input~

# series.rb
has_many :seasons, dependent: :destroy
has_many :episodes, :through => :seasons
accepts_nested_attributes_for :seasons
accepts_nested_attributes_for :episodes

# season.rb
belongs_to :series
has_many :episodes, dependent: :destroy

# episode.rb
belongs_to :season

# routes.rb
resources :series, except: [:show, :new] do
  resources:seasons, except: [:show], path: '' do
    resources :episodes, path: ''
  end
end

series/new.html.erb

<%= form_for @series do |f| %>
    <%= f.text_field :title %>
    <%= f.fields_for :seasons do |seasons_form| %>
      <%= seasons_form.text_field :title %>
      <%= seasons_form.fields_for :episodes do |episodes_form| %>
        <%= episodes_form.text_field :title %>
      <% end %>
    <% end %>
  <% end %>

Are you receiving episod's attributes in params hash? If yes, then have you whitelisted episode's attributes? — Hasmukh Rathod
– Hasmukh Rathod, Commented Sep 5, 2017 at 7:10
Thanks for the reply, this is my series_params: def series_params params.require(:person).permit(:title, seasons_attributes: [:id, :title], episodes_attributes: [:id, :title]) end — Dotol
– Dotol, Commented Sep 5, 2017 at 17:36
I wasn't able to, gave up a while ago. I'd appreciate some insight into what I was doing wrong or a possible solution/workaround — Dotol
– Dotol, Commented Aug 16, 2018 at 22:01
I know this is 5 years old but I currently have the same problem. Any solutions? — Nic
– Nic, Commented Jun 2, 2022 at 16:43

Hasmukh Rathod · Accepted Answer · 2017-09-06 00:27:23Z

3

series.rb

has_many :seasons, dependent: :destroy
has_many :episodes, :through => :seasons

accepts_nested_attributes_for :seasons
accepts_nested_attributes_for :episodes

season.rb

belongs_to :series
has_many :episodes, dependent: :destroy

accepts_nested_attributes_for :episodes

episode.rb

belongs_to :season

As you have used has_many :episodes, :through => :seasons , episodes parameters will be inside the hash of seasons. So you need to make a slight change in series_params method:

series controller

def new
  @series = Series.new
  #build objects of nested
  @season = @series.seasons.build  
  @episod = @season.episods.build
end

def series_params 
  params.require(:series).permit(:title, 
   seasons_attributes: [:id, :title, episodes_attributes: [:id, :title]]) 
end

Note: It is static. For dynamic object building, here is a good screencast

edited Sep 6, 2017 at 0:27

answered Sep 5, 2017 at 23:26

Hasmukh Rathod

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11 Comments

Dotol Over a year ago

I did precisely that and it still doesn't save episodes these are my params and form letter by letter: def series_params params.require(:series).permit(:title, seasons_attributes: [:id, :title, episodes_attributes: [:id, :title]]) end

Hasmukh Rathod Over a year ago

can you post your input params hash? You can find it on server log when you submit the form.

Hasmukh Rathod Over a year ago

In your season model, accept its nested params, that is episode's attributes. I have updated my answer.

Hasmukh Rathod Over a year ago

It is because, you may not have build episod's object in your controller's new method.

Hasmukh Rathod Over a year ago

For time being, can you remove nested routes and make them individual like resources :series, resources :seasons, resources :episods

|

kansiho · Accepted Answer · 2017-09-05 02:46:46Z

2

Replace

# series.rb
has_many :seasons, dependent: :destroy
accepts_nested_attributes_for :seasons
accepts_nested_attributes_for :episodes

with

# series.rb
has_many :seasons, dependent: :destroy
has_many :episodes, :through => :seasons
accepts_nested_attributes_for :seasons
accepts_nested_attributes_for :episodes

answered Sep 5, 2017 at 2:46

kansiho

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3 Comments

Dotol Over a year ago

This makes sense actually can't believe I thought of that, checking in a bit once I have access to a computer.

kansiho Over a year ago

This code shows how rails defined accepts_nested_attributes_for. if if reflection = _reflect_on_association(association_name) is nil, raise ArgumentError, "No association found for name `#{association_name}'. Has it been defined yet?" occurred.

Dotol Over a year ago

Thanks @Aoi_777 I updated the original post to further detail how episodes isn't being saved

Andrew · Accepted Answer · 2017-09-05 02:46:23Z

0

You need to move accepts_nested_attributes_for :episodes from the series model to the season model since the seasons form, <%= seasons_form.fields_for :episodes ... %> is accepting attributes for the episodes

answered Sep 5, 2017 at 2:46

Andrew

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1 Comment

Dotol Over a year ago

That would throw an undefined method 'episodes' in my build statement.

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