Question

我正尝试允许以简单的形式选择多个复选框字段：

<%= form_with(model: coffee_roast, local: true) do |form| %>
  <% if coffee_roast.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(coffee_roast.errors.count, "error") %> prohibited this coffee_roast from being saved:</h2>

      <ul>
      <% coffee_roast.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <strong><%= form.label :name %></strong>
    <%= form.text_field :name, id: :coffee_roast_name %>
  </div>

  <div class="field">
    <strong><%= form.label :bean,"Select bean(s)" %></strong>
    <%= collection_check_boxes(:coffee_roast, :coffee_beans, CoffeeBean.all, :id, :name) %>
  </div>

  <div class="actions">
    <%= form.submit %>
  </div>
<% end %>

collection_check_box通过连接表完美地从另一个模型中提取值。我的模型是：

coffee_bean.rb

class CoffeeBean < ApplicationRecord
    has_many :coffee_blends
    has_many :coffee_roasts, through: :coffee_blends
end

coffee_roast.rb

class CoffeeRoast < ApplicationRecord
    belongs_to :roaster
    has_many :coffee_blends
    has_many :coffee_beans, through: :coffee_blends
    has_many :flavours, through: :coffee_flavours
end

和联接表

coffee_blend.rb

class CoffeeBlend < ApplicationRecord
    belongs_to :coffee_bean
    belongs_to :coffee_roast
end

问题

当我保存coffee_roast并选中几个复选框时，记录创建无误，但是在连接表中看不到任何ID。

我怀疑可能是由于不允许coffee_roast_controller.rb

中的ID

我尝试了一些变体，但无法使其正常工作。这是我最近的尝试：

def coffee_roast_params
  params.require(:coffee_roast).permit(:name, :coffee_bean_name, coffee_bean_id:[])
end

Answer 1

尝试在下面喜欢

<%= f.collection_check_boxes :coffee_bean_ids, CoffeeBean.all.order(name: :asc), :id, :name do |cb| %>
    <% cb.label(class: "checkbox-inline input_checkbox") {cb.check_box(class: "checkbox") + cb.text } %>
<% end %>

和控制器参数中

coffee_bean_ids:[]

代替coffee_bean_id:[]

Rails 5：可以使用collection_check_boxes

1 个答案: