状況

ruby: 2.4.5
rails: 5.0.0.1
kaminari-core-1.2.2

以下のコマンド実行するとエラー文が出る

rails g kaminari:views bootstrap4

/usr/local/bundle/gems/kaminari-core-1.2.2/lib/generators/kaminari/views_generator.rb:117:in `get_files_in_master': private method `open' called for URI:Module (NoMethodError)

views_generator.rb 一部抜粋

views_generator.rb

module GitHubApiHelper
      require 'open-uri'

      def get_files_in_master
        master_tree_sha = URI.open('https://api.github.com/repos/amatsuda/kaminari_themes/git/refs/heads/master') do |json|
          ActiveSupport::JSON.decode(json.read)['object']['sha']
        end
        URI.open('https:i//api.github.com/repos/amatsuda/kaminari_themes/git/trees/' + master_tree_sha + '?recursive=1') do |json|
          blobs = ActiveSupport::JSON.decode(json.read)['tree'].find_all {|i| i['type'] == 'blob' }
          blobs.map do |blob|
            [blob['path'], blob['sha']]
          end
        end
      end
      module_function :get_files_in_master

      def get_content_for(path)
        URI.open('https://api.github.com/repos/amatsuda/kaminari_themes/contents/' + path) do |json|
          Base64.decode64(ActiveSupport::JSON.decode(json.read)['content'])
        end
      end
      module_function :get_content_for
    end

解決策

Rubyバージョン2.6よりURI.open('url')

それ以下はopen('url')

Rubyのバージョンを上げるかviews_generator.rbを修正する。
もしくはkaminari 1.1.1を指定する。

今回はviews_generator.rbを修正した

修正後 views_generator.rb


 module GitHubApiHelper
      require 'open-uri'

      def get_files_in_master
        master_tree_sha = open('https://api.github.com/repos/amatsuda/kaminari_themes/git/refs/heads/master') do |json|
          ActiveSupport::JSON.decode(json.read)['object']['sha']
        end
        open('https:i//api.github.com/repos/amatsuda/kaminari_themes/git/trees/' + master_tree_sha + '?recursive=1') do |json|
          blobs = ActiveSupport::JSON.decode(json.read)['tree'].find_all {|i| i['type'] == 'blob' }
          blobs.map do |blob|
            [blob['path'], blob['sha']]
          end
        end
      end
      module_function :get_files_in_master

      def get_content_for(path)
        open('https://api.github.com/repos/amatsuda/kaminari_themes/contents/' + path) do |json|
          Base64.decode64(ActiveSupport::JSON.decode(json.read)['content'])
        end
      end
      module_function :get_content_for
    end

プロジェクト配下にviews_generator.rbを作成して以下のコマンドをDockerfile内、`RUN bundle install`後に追加した。

COPY views_generator.rb /usr/local/bundle/gems/kaminari-core-1.2.2/lib/generators/kaminari/

Ruby 2.4.5 OpenURI

Ruby 2.6 OpenURI