Edit page to display all category names with edit inputs on each

问题

I have categories nested inside of guides. I'm building an app to learn rails better and I'm trying to make a page that will display all categories that belong to a guide and have edit inputs under them and a save button next to it so the user can edit the names of the categories they want to change.

Bit stuck on how exactly how get this done.

here is the category_item_keys controller

def edit
 @guide = Guide.friendly.find(params[:guide_id])
 @category = Category.friendly.find(params[:category_id])
 @key = @category.category_item_keys
end

def update

 @guide = Guide.friendly.find(params[:guide_id])
 @category = Category.friendly.find(params[:category_id])
 @key = @category.category_item_keys.friendly.find(key_params) # no idea what to make this equal because it isn't one set key being edited on the page


 if @key =  @category.category_item_keys.update_attributes(key_params)
  flash[:success] = "Key updated"
  redirect_to @guide
 else
  render 'edit'
 end

end

private

def key_params
params.require(:category_item_key).permit(:key, :slug)
end

routes

match '/guides/:guide_id/:category_id/keys/edit' => 'category_item_keys#edit', :via => :get
match '/guides/:guide_id/:category_id/keys/' => 'category_item_keys#update', :via => :post, as: :category_item_keys_update

edit.html.erb

  <ul>
<% @key.each do |key| %>

  <li><%= key.key #just shows key name %><br>
    <%= form_for([@category, @keys], url: category_item_keys_create_path) do |f| %>
       <%= render 'shared/error_messages', object: f.object %>

      <%= f.label :key, "Key name" %>
      <%= f.text_field :key %>

      <%= f.submit "Save"  %>
    <% end %>
    </li>


<% end %>
  </ul>

This just gives me an error of:

undefined method `to_key' for #<CategoryItemKey::ActiveRecord_Associations_CollectionProxy:0x007fe20a86b480>

Later I plan on using an in-place editor gem but i would like to learn how this can be done fist.

EDIT:

Fixed the error ( changed form_for([@category, @keys] to form_for([@category, key] and turns out this way works for displaying and allowing all categories to be edited... to an extent.

I get another error when i submit a form undefined method 'update_attribute'

EDIT 2 slowly getting there. I Changed the update @key variable to @key = @category.category_item_keys.all to fix the error. But this line is now giving me problems

if @key = @category.category_item_keys.update_attributes(key_params)'

THIRD EDIT

ERROR

Couldn't find CategoryItemKey without an ID

on line

@key     = @category.category_item_keys.find params[:id]

paramaters:

{"utf8"=>"✓", "_method"=>"patch", "authenticity_token"=>"egj/OebdSbxxaoaTkr46WVIOIIu4Ezijzu45kqxLT0krjFWHqi67SRJDSgV7bcL6SeoGpUSYsrolspylCXBu9g==",
 "category_item_key"=>{"name"=>"def1111"},
 "commit"=>"Save",
 "guide_id"=>"dbz",
 "category_id"=>"characters"}

回答1:

Here's how to clean up the code:

#config/routes.rb
resources :guides do
    resources :categories, path: "" do
       resources :category_item_keys, path: "keys", only: [:update] do
          get :edit, on: :collection #-> url.com/guides/:guide_id/:category_id/keys/edit
       end
    end
end

#app/controllers/keys_controller.rb
class KeysController < ApplicationController
    def edit
        @guide    = Guide.find params[:guide_id]
        @category = Category.find params[:category_id]
        @keys     = @category.category_item_keys
    end

    def update
        @guide    = Guide.find params[:guide_id]
        @category = Category.find params[:category_id]
        @key      = @category.category_item_keys.find params[:id] 

        if @key.update key_params
           redirect_to @guide, success: "Key Updated"
        else
           render 'edit'
        end
    end

    private

    def key_params
       params.require(:category_item_key).permit(:key)
    end
end

#app/views/keys/edit.html.erb
<% @keys.each do |key| %>
   <%= form_for [@guide, @category, key] do |f| %>
      <%= f.text_field :key %>
      <%= f.submit %>
   <% end %>
<% end %>

If you wanted to use an in-place editor gem, I'd recommend looking at X-Editable, as we've applied it here (its only a demo app, just sign up for free and go to profile):

回答2:

Looks like you are trying to do update_attributes on a collection instead of an object. Try to first fetch the key object

@key = @category.category_item_keys.friendly.find(params[:id])

and then try to update its attributes

if @key.update_attributes(key_params)
    ...
end

回答3:

use nested forms available in rails 4.

来源：https://stackoverflow.com/questions/34736173/edit-page-to-display-all-category-names-with-edit-inputs-on-each

标签

ruby-on-rails

ruby-on-rails-4

controller