質問編集履歴
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誤字の修正
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Rails初心者です。
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Railstutorial10章でUsersページでユーザーを表示する実装をして、/usersページを開こうとしたら下記のようなエラーが表示されました。
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```ここに言語を入力
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NoMethodError in Users#index
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Showing /home/ec2-user/environment/sample_app/app/views/users/index.html.erb where line #7 raised:
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undefined method `downcase' for nil:NilClass
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Extracted source (around line #5):
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渡されたユーザーのGravatar画像を返す
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def gravatar_for(user, size: 80)
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gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
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gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
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image_tag(gravatar_url, alt: user.name, class: "gravatar")
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end
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# 渡されたユーザーのGravatar画像を返す
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def gravatar_for(user, size: 80)
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gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
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gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
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image_tag(gravatar_url, alt: user.name, class: "gravatar")
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end
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Rails.root: /home/ec2-user/environment/sample_app
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Application Trace | Framework Trace | Full Trace
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app/helpers/users_helper.rb:5:in `gravatar_for'
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app/views/users/index.html.erb:7:in `block in _app_views_users_index_html_erb__4353731050743654976_70117457819340'
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app/views/users/index.html.erb:5:in `_app_views_users_index_html_erb__4353731050743654976_70117457819340'
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Request
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Parameters:
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None
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Toggle session dump
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Toggle env dump
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Response
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Headers:
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None
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```
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@usersのどこかが間違っているかと思っているのですが、全くわかりません。
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どなたかわかる方がいらっしゃいましたらご教授ください。
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/sample_app/app/controllers/users_controller.rb
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```ここに言語を入力
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class UsersController < ApplicationController
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@@ -77,4 +128,33 @@
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redirect_to(root_url) unless current_user?(@user)
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end
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end
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```
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/sample_app/app/views/users/index.html.erb
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```ここに言語を入力
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<% provide(:title, 'All users') %>
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<h1>All users</h1>
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<ul class="users">
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<% @users.each do |user| %>
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<li>
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<%= gravatar_for user, size: 50 %>
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<%= link_to user.name, user %>
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</li>
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<% end %>
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</ul>
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```
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/sample_app/app/helpers/users_helper.rb
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```ここに言語を入力
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module UsersHelper
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# 渡されたユーザーのGravatar画像を返す
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def gravatar_for(user, size: 80)
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gravatar_id = Digest::MD5::hexdigest(user.email.downcase)
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gravatar_url = "https://secure.gravatar.com/avatar/#{gravatar_id}?s=#{size}"
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image_tag(gravatar_url, alt: user.name, class: "gravatar")
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end
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end
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80
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```
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