ruby-on-rails - 丰富连接表的嵌套属性，使用 simple_form Rails

Question

我想创建一个具有嵌套属性的表单，该表单在富连接表中填充一条记录。 (在富连接表中创建的记录当然应该具有适当的外键。)

我还没有找到关于在 has_many :through 上创建嵌套表单字段的彻底答案。关系。请帮忙!

对于这个例子，我有一个用户表单。在该表单中，我还尝试在 users_pets 中填充一条记录。表(富连接表)。

附加问题:富连接模型应该是单数还是复数？示例:app/models/owners_pets.rb或 app/models/owners_pet.rb .

应用程序/模型/owner.rb

class Owner < ActiveRecord::Base
    has_many :owners_pets, allow_destroy: true
    has_many :pets, through: :owners_pets
end

应用程序/模型/pet.rb

class Pet < ActiveRecord::Base
    has_many :owners_pets, allow_destroy: true
    has_many :owners, through: :owners_pets
end

应用程序/模型/owners_pets.rb

class OwnersPet < ActiveRecord::Base
    belongs_to :owners
    belongs_to :pets
end

应用程序/ Controller /owners.rb

def owner_params
    params.require(:owner).permit(:first_name, owners_pets_attributes: [:id, :pet_name, :pet_id])
end

app/views/owners/_form.html.erb

<%= simple_form_for(@owner) do |f| %>
    <%= f.input :first_name %>
    <%= f.simple_fields_for :owners_pets do |ff|
        <%= ff.input :pet_name %>
    <% end %>
    <div>
       <%= f.button :submit %>
    </div>
<% end %>

Answer 1

这是答案，感谢导师的大量帮助。它帮助我记住富连接命名约定在最后不应该复数，就像其他非富连接模型一样。例如:book_page.rb不是 books_pages.rb.偶books_page.rb会工作(只需相应地更新您的强参数和数据库表)。重要的部分是整个模型必须遵循单数模型的 rails 约定(末尾没有“s”)。

在下面的富联接模型中，我决定将其命名为完全单数版本:owner_pet.rb与其他版本相反:owners_pet.rb . (当然，我的数据库表被命名为: owner_pets )

应用程序/模型/owner.rb

class Owner < ActiveRecord::Base
    has_many :owner_pets
    has_many :pets, through: :owner_pets
    accepts_nested_attributes_for :owner_pets, allow_destroy: true
end

应用程序/模型/pet.rb

class Pet < ActiveRecord::Base
    has_many :owner_pets
    has_many :owners, through: :owner_pets
end

应用程序/模型/owner_pet.rb

class OwnerPet < ActiveRecord::Base
    belongs_to :owner
    belongs_to :pet
end

应用程序/ Controller /owners.rb

def new
    @owner = Owner.new
    @owner.owner_pets.build
end
private
  def owner_params
      params.require(:owner).permit(:first_name, owner_pets_attributes: [:_destroy, :id, :pet_name, :pet_id, :owner_id])
  end

app/views/owners/_form.html.erb

<%= simple_form_for(@owner) do |f| %>
    <%= f.input :first_name %>
    <%= f.simple_fields_for :owner_pets do |ff| %>
        <%= ff.input :pet_name %>
        <%= ff.input :pet_id, collection: Pet.all, label_method: "pet_type" %>
    <% end %>
    <div>
       <%= f.button :submit %>
    </div>
<% end %>