validates_overlap 1.0.0
It can be useful when you you are developing some app where you will work with meetings, events etc.
          Gemfile:
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          安裝:
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      Runtime 相依性套件 (1):
            rails
            >= 6.0.0
          
    Development 相依性套件 (8):
            bundler
            >= 0
          
          
            database_cleaner
            >= 0
          
          
            factory_girl_rails
            >= 0
          
          
            pry
            >= 0
          
          
            rb-readline
            >= 0
          
          
            rspec-rails
            >= 0
          
          
            rubocop
            >= 0
          
          
            sqlite3
            >= 0