ruby-on-rails - 在Rails 4中使用单个表单保存多个记录

Question

我有一个名为Family的模型，其中belongs_to :user我想让用户以/views/families/new.html.erb的单一形式添加多个家庭成员

因此，用户看到了一个表单，用于为一个user_id创建3个家庭成员

以3种相同的形式输入数据，然后命中提交

提交一次

后，应将 3个单独表格中的数据保存为3个不同的记录在数据库中

现在，当我提交表单时，数据库中的所有值都保存为NULL。

我在做什么错？我不应该使用强参数吗？

编辑:对不起，我早些时候应该提供了更详细的代码
在代码中稍加修改后

# config/routes.rb
resources :families

#app/models/user.rb 
class User < ActiveRecord::Base
  has_many :families
end

#app/models/family.rb
class Family < ActiveRecord::Base
  belongs_to :user
end

#app/controllers/families_controller.rb
class FamiliesController < ActiveRecord::Controller
  def new
  end
  
  def create
    @family = Family.new(family_params)
    a = params[:family][:"0"]
    @family.user_id = current_user.id
    if @family.save
      flash[:notice] = params[:family][:"0"]
      redirect_to dummy_path
    else
      flash[:notice] = "didnt happen"
    end
  end
  
  private
  
  def family_params
    params.require(:family).permit(:all)
  end
end

#app/views/families/_form.html.erb
<%= form_tag(controller: "families") do %>
  <% i = 0 %>
  <% 3.times do %>
    <br>
    <h2>Family Member # <%= i+1 %> : </h2>
    <br>
    <%= fields_for("family[#{i}]") do |f| %>
        <%= f.text_field :name, class: "form-control" , placeholder: "Name"%> <br>
        <%= f.text_field :relationship, class: "form-control" , placeholder: "Relationship" %> <br>
        <%= f.date_field :dob, class: "form-control" %> <br>
        <%= f.text_field :blood_group, class: "form-control", placeholder: "Blood group" %> <br>
        <%= f.text_field :email, class: "form-control", placeholder: "Email" %> <br>
        <%= f.number_field :phone, class: "form-control", placeholder: "Phone number" %> <br>
        <%= f.text_area :hobbies, class: "form-control", placeholder: "Hobbies" %> <br>
        <% i=i+1 %>
    <% end %>
    <hr>
  <% end %><br>
  <%= submit_tag "Submit", class: "btn btn-primary" %> <br>
<% end %>

Answer 1

您要使用nested forms。您应该能够复制并粘贴以下代码以开始操作:

应用程序/模型/family.rb

class Family < ActiveRecord::Base
  has_many :users

  accepts_nested_attributes_for :users
end

应用程序/模型/user.rb

class User < ActiveRecord::Base
  belongs_to :family
end

应用程序/ View /家庭/new.html.erb

<%= form_for(@family) do |f| %>
  <%= f.fields_for :users do |user| %>
    <p>
    <%= user.text_field :name %><br>
    <%= user.text_field :email %>
    </p>
  <% end %>

  <%= f.submit %>
<% end %>

应用/ Controller /家庭_controller.rb

  [...]

  def new
    @family = Family.new
    3.times { @family.users.build }
  end

  [...]

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_family
      @family = Family.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def family_params
      params.require(:family).permit(:name, users_attributes: [ :name, :email ])
    end