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panel/app/models/metadata_image.rb

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# frozen_string_literal: true
# Define un campo de imagen
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class MetadataImage < MetadataFile
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def validate
super
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errors << I18n.t('metadata.image.not_an_image') unless image?
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errors.compact!
errors.empty?
end
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# Determina si es una imagen antes de subirla
def image?
if value['path'].is_a? ActionDispatch::Http::UploadedFile
`file --mime-type "#{value['path'].tempfile.path}"`
.split(' ')
.last
.chomp
.starts_with? 'image/'
else
true
end
end
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end