Question

我有几个模型Score ScoreAuthority ScoreColor和ScoreType。得分has_one权限，颜色和类型。权限，颜色和每个belong_to分数的类型。我在创建Score的表单时遇到问题。

我希望用户从Scores创建这种关系，每个人似乎只处理从权限，颜色，类型表单创建的反向场景。我的具体含义是例如：

Authorities
 - foo
 - bar

Colors
 - red
 - blue

我希望使用进入分数，选择创建新分数，然后从下拉列表中选择foo，从颜色列表中选择blue，输入分数并提交。权威，颜色和类型不会有太大变化，用户从每个中选择分数都是有意义的。

当我这样做时，我收到以下错误：

ScoreAuthority(#2248480380) expected, got String(#2155957040)

得分/ _form.html.erb

<%= form_for @score, :html => { :class => 'form-horizontal' } do |f| %>

  <div class="control-group">
  <%= f.label :product_id, "Products", :class => 'control-label' %>
    <div class="controls">
      <%= f.collection_select(:product_id, Product.order(:name), :id, :name) %>
    </div>
  </div>

  <div class="control-group">
  <%= f.label :score_authority, "Score Authority", :class => 'control-label' %>
    <div class="controls">
      <%= f.collection_select :score_authority, ScoreAuthority.order(:name), :id, :name, {}, {:class=>'chosen'} %>
    </div>
  </div>

  <div class="control-group">
  <%= f.label :score_type, "Score Types", :class => 'control-label' %>
    <div class="controls">
      <%#= f.collection_select(:score_type, ScoreType.order(:name), :id, :name) %>
      <%= f.collection_select :score_type, ScoreType.order(:name), :id, :name, {}, {:class=>'chosen'} %>

    </div>
  </div>

  <div class="control-group">
  <%= f.label :score_color, "Score Types", :class => 'control-label' %>
    <div class="controls">
      <%= f.collection_select :score_color, ScoreColor.order(:name), :id, :name, {}, {:class=>'chosen'} %>
    </div>
  </div>

  <div class="control-group">
    <%= f.label :notation, :class => 'control-label' %>
    <div class="controls">
      <%= f.text_field :notation, :class => 'text_field' %>
    </div>
  </div>
  <div class="control-group">
    <%= f.label :value, :class => 'control-label' %>
    <div class="controls">
      <%= f.text_field :value, :class => 'text_field' %>
    </div>
  </div>

  <div class="form-actions">
    <%= f.submit nil, :class => 'btn btn-primary' %>
    <%= link_to t('.cancel', :default => t("helpers.links.cancel")),
                scores_path, :class => 'btn' %>
  </div>
<% end %>

score_authorities，score_colors，score_types表都有score_id作为列。这些模型中的每一个都有belongs_to :score。

得分模型

has_one :score_authority
has_one :score_type
has_one :score_color

不确定我在这里做错了什么，任何帮助都将不胜感激。谢谢！

Answer 1

您应该使用：score_authority_id而不是：表格中的score_authority

<%= f.collection_select :score_authority_id, ScoreAuthority.order(:name), :id, :name, {}, {:class=>'chosen'} %>

 <%= f.collection_select :score_color_id, ScoreColor.order(:name), :id, :name, {}, {:class=>'chosen'} %>

 <%= f.collection_select :score_color_id, ScoreColor.order(:name), :id, :name, {}, {:class=>'chosen'} %>

请参阅此How do I create the view for the has_one association?了解更多详情

或者你可以尝试

class Score
  has_one :score_authority
  accepts_nested_attributes_for :score_authority
end

<%= form_for @score ... do |f| %>
  ...
  <%= f.fields_for :score_authority do |b| %>
    <%= b.collection_select :id, ScoreAuthority.all, :id, :name %>
    ...
  <% end %>
  ...
<% end %>

为什么我的has_one关系不起作用

1 个答案: