從下拉菜單中選擇，編輯和更新Rails

Question

我有一個下拉菜單，裏面有醫生的名字。我希望能夠從下拉列表中選擇一位醫生，點擊編輯並轉到醫生的編輯頁面。

在我的路線：

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

在我的私人醫生控制器：

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 

在我的私人醫生指數：

<%= 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_form.edit.html.erb

<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> 

FIRST_NAME屬性：試圖更新時

錯誤

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

爲first_name的價值是存在的，它被列入白名單了。我不確定發生了什麼事。

Answer 1

因爲您正在更新資源，所以在這種情況下，我會推薦使用form_for而不是form_tag。 form_tag確實最適合通過POST創建資源，但即使如此，form_for也是一個更方便的解決方案。

您的代碼就變成了：

<%= 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 %>