Question

我有一个医生姓名的下拉列表。我希望能够从下拉列表中选择一位医生，点击编辑并转到医生的编辑页面。

在我的路线中：

  resources :physicians, only: [:index, :new, :create, :update]
  get '/physicians/edit', to: 'physicians#edit'

在我的医生控制员中：

def update
 @physician = Physician.find(params[:id])

 respond_to do |format|
  if @physican.update_attributes(physician_params)
    format.html { redirect_to @physican, info: 'Physician was successfully updated.' }
  else
    format.html { render :edit }
  end
 end
end
def physician_params
  params.require(:physician).permit(:office_id, :user_id, :full_name, :prefix, :first_name, :middle_name, :last_name, :suffix, :primary)
end

在我的医生指数中：

  <%= form_tag '/physicians/edit', :method => :get do %>

    <%= select_tag :id, options_from_collection_for_select(@physicians, :id, :first_name),
                       prompt: 'Choose one', id: 'physician_select', class: 'form-control option-large' %>
    <%= submit_tag 'Edit', class: 'btn' %>
  <% end %>

在我的_form.edit.html.erb

中

<div class="center" role="form">
<%= form_tag physician_path(@physician), :method => :patch do %>

  <div class="form-group space">
    <%= label_tag :first_name %>
    <%= text_field_tag :first_name, params[:first_name], class: 'form-control' %>

  </div>

  <div class="form-group space">
    <%= link_to '', root_path, class: 'btn btn-primary glyphicon glyphicon-triangle-left' %>
    <%= submit_tag 'Update Physician', class: 'btn btn-warning pull-add-btn' %>
  </div>
<% end %>
</div>

尝试更新：first_name属性时出错：

ActionController::ParameterMissing in PhysiciansController#update
param is missing or the value is empty: physician

first_name的值在那里，它也被列入白名单。我不确定发生了什么。

Answer 1

我建议在这种情况下使用form_for而不是form_tag，因为您要更新资源。 form_tag最适合用于通过POST创建资源，但即便如此form_for也是一种更方便的解决方案。

您的代码变为：

<%= form_for @physician do |f| %>    
  <div class="form-group space">
    <%= f.label :first_name %>
    <%= f.text_field :first_name, class: 'form-control' %>
  </div>

  <div class="form-group space">
    <%= link_to '', root_path, class: 'btn btn-primary glyphicon glyphicon-triangle-left' %>
    <%= f.submit 'Update Physician', class: 'btn btn-warning pull-add-btn' %>
  </div>
<% end %>

从Rails中的下拉列表，编辑和更新中进行选择

1 个答案: