質問編集履歴
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###補足情報(言語/FW/ツール等のバージョンなど)
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使用しているジェム
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``gem 'carrierwave'``
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``gem 'mini_magick'``
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``gem 'mini_magick'``
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```ruby
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#images_uploader.rb
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class ImagesUploader < CarrierWave::Uploader::Base
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include CarrierWave::MiniMagick
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# Midium size
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version :midium do
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process resize_to_fill: [300, 300, "Center"]
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end
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# Small size
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version :small do
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process resize_to_fill: [150, 150, "Center"]
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end
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def extension_white_list
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%w(jpg jpeg gif png)
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end
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end
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```
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