导轨嵌套属性3级深度

Question

我有模型seriesseasons和episodes。从series/new的形式我想创建一个系列，季节和情节一起。我正在阅读Rails Routing和Nested Forms指南，但我不知道我在做什么错，因为指南并未涵盖3级的深度。当使用嵌套表单时，Rails仅插入Series和Season值而不是Episode值。

我的方法更正确吗？我会很感激任何输入〜

# 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 

系列/ 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 %> 

Answer 1

您需要从该系列机型移动accepts_nested_attributes_for :episodes以来季节形式季节模型，<%= seasons_form.fields_for :episodes ... %>是接受属性为episodes

Answer 2

更换

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

与

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

Answer 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 

正如你已经使用has_many :episodes, :through => :seasons，情节参数将里面hash的seasons。所以，你需要做一个细微的变化在series_params方法：

系列控制器

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 

注：这是静态的。对于动态对象构建，这里是一个很好的screencast