質問編集履歴
2
indexアクション追加
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SubCategory コントローラ
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```ruby
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class SubCategoriesController < ApplicationController
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def index
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@sub_categories = SubCategory.where(category_id: params[:category_id]).includes(:items)
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@sub_categories = SubCategory.where(category_id: params[:category_id]).includes(:items)
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respond_to do |format|
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# カテゴリ一覧から呼び出し
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format.html do
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end
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# セレクトボックスから呼び出し
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format.js do
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render json: @sub_categories.select(:id, :name)
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end
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end
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end
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end
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```
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log追加
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```
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@sub_categoriesがnilのためビューの1行目でエラーになります。
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「undefined method `each' for nil:NilClass」
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「undefined method `each' for nil:NilClass」
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2020/06/17追記
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SubCategoryにアクセスした時のログ(allは外しました)
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```log
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Started GET "/sub_categories/1" for 58.13.43.197 at 2020-06-17 14:04:53 +0000
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Cannot render console from 58.13.43.197! Allowed networks: 127.0.0.1, ::1, 127.0.0.0/127.255.255.255
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Processing by SubCategoriesController#index as HTML
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Parameters: {"category_id"=>"1"}
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Rendering sub_categories/index.html.erb within layouts/application
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Rendered sub_categories/index.html.erb within layouts/application (2.4ms)
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Completed 500 Internal Server Error in 11ms (ActiveRecord: 0.3ms)
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ActionView::Template::Error (undefined method `each' for nil:NilClass):
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1:
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2: <% @sub_categories.each do |sub_category| %>
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3: <p><%= link_to sub_category.name, items_path(search: {sub_category_id: sub_category.id}) %> <%= "(#{sub_category.items.count})" %></p>
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4:
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5: <% end %>
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app/views/sub_categories/index.html.erb:2:in `_app_views_sub_categories_index_html_erb___733152297473355794_70113344435740'
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```
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