blocks|key|4333250|text|好吧，这不是很好，但在他们加入一些验证之前，这可能是必要的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4333251|++validate+:logo_validation

++def+logo_validation
++++if+logo.attached?
++++++if+logo.blob.byte_size+>+1000000
++++++++logo.purge
++++++++errors[:base]+<<+'Too+big'
++++++elsif+!logo.blob.content_type.starts_with?('image/')
++++++++logo.purge
++++++++errors[:base]+<<+'Wrong+format'
++++++end
++++end
++end|code-block|syntax|javascript|4333252|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Well, it ain't pretty, but this may be necessary until they bake in some validation:

<pre><code> validate :logo_validation

 def logo_validation
 if logo.attached?
 if logo.blob.byte_size &gt; 1000000
 logo.purge
 errors[:base] &lt;&lt; 'Too big'
 elsif !logo.blob.content_type.starts_with?('image/')
 logo.purge
 errors[:base] &lt;&lt; 'Wrong format'
 end
 end
 end
</code></pre>

blocks|key|4333608|text|你可以使用很棒的https://github.com/musaffa/file_validators+gem|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4333609|class+Profile+<+ActiveRecord::Base
++has_one_attached+:avatar
++validates+:avatar,+file_size:+{+less_than_or_equal_to:+100.kilobytes+},
++++file_content_type:+{+allow:+['image/jpeg',+'image/png']+}
end|code-block|syntax|javascript|4333610|我将它与表单对象一起使用，所以我不能100%25确定它是否直接与AR一起工作，但它应该……|4333611|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/musaffa/file_validators^0|8|16|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You can use awesome <a href="https://github.com/musaffa/file_validators" rel="noreferrer">https://github.com/musaffa/file_validators</a> gem

<pre><code>class Profile &lt; ActiveRecord::Base
 has_one_attached :avatar
 validates :avatar, file_size: { less_than_or_equal_to: 100.kilobytes },
 file_content_type: { allow: ['image/jpeg', 'image/png'] }
end
</code></pre>

I'm using it with form object so I'm not 100% sure it is working directly with AR but it should...

blocks|key|4333780|text|偶然发现了这个宝石：https://github.com/igorkasyanchuk/active_storage_validations|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4333781|class+User+<+ApplicationRecord
++has_one_attached+:avatar
++has_many_attached+:photos

++validates+:name,+presence:+true

++validates+:avatar,+attached:+true,+content_type:+'image/png',
+++++++++++++++++++++++++++++++++++++dimension:+{+width:+200,+height:+200+}
++validates+:photos,+attached:+true,+content_type:+['image/png',+'image/jpg',+'image/jpeg'],
+++++++++++++++++++++++++++++++++++++dimension:+{+width:+{+min:+800,+max:+2400+},
++++++++++++++++++++++++++++++++++++++++++++++++++height:+{+min:+600,+max:+1800+},+message:+'is+not+given+between+dimension'+}
end|code-block|syntax|javascript|4333782|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/igorkasyanchuk/active_storage_validations^0|A|1O|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Came across this gem: <a href="https://github.com/igorkasyanchuk/active_storage_validations" rel="noreferrer">https://github.com/igorkasyanchuk/active_storage_validations</a>

<pre><code>class User &lt; ApplicationRecord
 has_one_attached :avatar
 has_many_attached :photos

 validates :name, presence: true

 validates :avatar, attached: true, content_type: 'image/png',
 dimension: { width: 200, height: 200 }
 validates :photos, attached: true, content_type: ['image/png', 'image/jpg', 'image/jpeg'],
 dimension: { width: { min: 800, max: 2400 },
 height: { min: 600, max: 1800 }, message: 'is not given between dimension' }
end
</code></pre>

blocks|key|4333747|text|这是我在Rails+5.2中验证内容类型的解决方案，正如您可能知道的那样，它有一个缺陷，即附件被分配到模型后就会被保存。它可能也适用于Rails6。我所做的是包含验证的猴子补丁ActiveStorage::Attachment：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4333748|config/initializers/active_storage_attachment_validations.rb|4333749|Rails.configuration.to_prepare+do
++ActiveStorage::Attachment.class_eval+do
++++ALLOWED_CONTENT_TYPES+=+%25w[image/png+image/jpg+image/jpeg].freeze

++++validates+:content_type,+content_type:+{+in:+ALLOWED_CONTENT_TYPES,+message:+'of+attached+files+is+not+valid'+}
++end
end|code-block|syntax|javascript|4333750|app/validators/content_type_validator.rb|4333751|class+ContentTypeValidator+<+ActiveModel::EachValidator
++def+validate_each(record,+attribute,+_value)
++++return+true+if+types.empty?
++++return+true+if+content_type_valid?(record)

++++errors_options+=+{+authorized_types:+types.join(',+')+}
++++errors_options[:message]+=+options[:message]+if+options[:message].present?
++++errors_options[:content_type]+=+record.blob&.content_type
++++record.errors.add(attribute,+:content_type_invalid,+errors_options)
++end

++private

++def+content_type_valid?(record)
++++record.blob&.content_type.in?(types)
++end

++def+types
++++Array.wrap(options[:with])+%2B+Array.wrap(options[:in])
++end
end|4333752|由于在Rails+5中实现了attach方法：|4333753|++++def+attach(*attachables)
++++++attachables.flatten.collect+do+%7Cattachable%7C
++++++++if+record.new_record?
++++++++++attachments.build(record:+record,+blob:+create_blob_from(attachable))
++++++++else
++++++++++attachments.create!(record:+record,+blob:+create_blob_from(attachable))
++++++++end
++++++end
++++end|4333754|当验证失败时，create!方法会引发一个ActiveRecord::RecordInvalid异常，但它只需要被拯救，仅此而已。|4333755|entityMap^0|2G|P|0|0|1O|0|0|0|14|0|0|E|6|0|0|7|7|L|R|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|T|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|X|$]]

Here is my solution to validate content types in Rails 5.2, that as you may know it has the pitfall that attachments are saved as soon as they are assigned to a model. It may also work for Rails 6. What I did is monkey-patch <code>ActiveStorage::Attachment</code> to include validations:

<code>config/initializers/active_storage_attachment_validations.rb</code>:

<pre class="lang-rb prettyprint-override"><code>Rails.configuration.to_prepare do
 ActiveStorage::Attachment.class_eval do
 ALLOWED_CONTENT_TYPES = %w[image/png image/jpg image/jpeg].freeze

 validates :content_type, content_type: { in: ALLOWED_CONTENT_TYPES, message: 'of attached files is not valid' }
 end
end
</code></pre>

<code>app/validators/content_type_validator.rb</code>:

<pre class="lang-rb prettyprint-override"><code>class ContentTypeValidator &lt; ActiveModel::EachValidator
 def validate_each(record, attribute, _value)
 return true if types.empty?
 return true if content_type_valid?(record)

 errors_options = { authorized_types: types.join(', ') }
 errors_options[:message] = options[:message] if options[:message].present?
 errors_options[:content_type] = record.blob&amp;.content_type
 record.errors.add(attribute, :content_type_invalid, errors_options)
 end

 private

 def content_type_valid?(record)
 record.blob&amp;.content_type.in?(types)
 end

 def types
 Array.wrap(options[:with]) + Array.wrap(options[:in])
 end
end
</code></pre>

Due to the implementation of the <code>attach</code> method in Rails 5:

<pre class="lang-rb prettyprint-override"><code> def attach(*attachables)
 attachables.flatten.collect do |attachable|
 if record.new_record?
 attachments.build(record: record, blob: create_blob_from(attachable))
 else
 attachments.create!(record: record, blob: create_blob_from(attachable))
 end
 end
 end
</code></pre>

The <code>create!</code> method raises an <code>ActiveRecord::RecordInvalid</code> exception when validations fail, but it just needs to be rescued and that's all.

blocks|key|4333346|text|复制app/controllers/active_storage/direct_uploads_controller.rb文件中ActiveStorage的DirectUploadsController内容，并修改create方法。您可以向此控制器添加身份验证，添加对文件大小或mime类型的常规验证，因为此控制器的create方法将为要上载的文件创建url。因此，您可以通过控制此控制器中的大小和mime类型来阻止任何文件上传。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4333347|简单的验证可以是：|4333348|#+...
def+create
++raise+SomeError+if+blob_args[:byte_size]+>+10240+#+10+megabytes
++blob+=+ActiveStorage::Blob.create_before_direct_upload!(blob_args)
++render+json:+direct_upload_json(blob)
end
#+...|code-block|syntax|javascript|4333349|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rails/rails/blob/master/activestorage/app/controllers/active_storage/direct_uploads_controller.rb#L7-L10^0|2|1N|26|N|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Copy contents of the ActiveStorage's <a href="https://github.com/rails/rails/blob/master/activestorage/app/controllers/active_storage/direct_uploads_controller.rb#L7-L10" rel="nofollow noreferrer">DirectUploadsController</a> in the <code>app/controllers/active_storage/direct_uploads_controller.rb</code> file and modify the create method. You can add authentication to this controller, add general validations on the file size or mime type, because create method of this controller creates the url for the file to be uploaded. So you can prevent any file upload by controlling size and mime type in this controller.

A simple validation could be:

<pre><code># ...
def create
 raise SomeError if blob_args[:byte_size] &gt; 10240 # 10 megabytes
 blob = ActiveStorage::Blob.create_before_direct_upload!(blob_args)
 render json: direct_upload_json(blob)
end
# ...
</code></pre>

blocks|key|4333719|text|我找到了一种使用回调before_save验证和删除附件的方法。这是一种有用的方法，因为如果您在事务期间验证文件(并且您想要清除它)，则在添加错误之后，它将回滚删除附件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4333720|before_save+:check_logo_file,+on:+%25i[create+update]

def+check_favicon_content_type
++++PartnerValidators::CustomPartnerFaviconValidator.new.validate(self)
end

module+PartnerValidators
++++class+CustomPartnerFaviconValidator+<+ActiveModel::Validator
++++++++ALLOWED_MIME_TYPES+=+%25w(image/vnd.microsoft.icon+image/x-icon+image/png).freeze
++++++++private_constant+:ALLOWED_MIME_TYPES

++++++++def+validate(partner)
++++++++++++if+partner.favicon.attached?+&&+invalid_content_type?(partner)
++++++++++++++++partner.errors.add(:favicon,+I18n.t("active_admin.errors.favicon"))
++++++++++++++++partner.favicon.purge
++++++++++++end
++++++++end

++++++++private

++++++++def+invalid_content_type?(partner)
++++++++++++!partner.favicon.blob.content_type.in?(ALLOWED_MIME_TYPES)
++++++++end
++++end
end|code-block|syntax|javascript|4333721|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I found a way to validate and delete attachments with callback before_save.
This is a useful approach because if you validate file during the transaction (and you want to purge it), after adding error and it will rollback deleting the attachment.

<pre><code>before_save :check_logo_file, on: %i[create update]

def check_favicon_content_type
 PartnerValidators::CustomPartnerFaviconValidator.new.validate(self)
end

module PartnerValidators
 class CustomPartnerFaviconValidator &lt; ActiveModel::Validator
 ALLOWED_MIME_TYPES = %w(image/vnd.microsoft.icon image/x-icon image/png).freeze
 private_constant :ALLOWED_MIME_TYPES

 def validate(partner)
 if partner.favicon.attached? &amp;&amp; invalid_content_type?(partner)
 partner.errors.add(:favicon, I18n.t("active_admin.errors.favicon"))
 partner.favicon.purge
 end
 end

 private

 def invalid_content_type?(partner)
 !partner.favicon.blob.content_type.in?(ALLOWED_MIME_TYPES)
 end
 end
end
</code></pre>

Is there a way to validate attachments with ActiveStorage? For example, if I want to validate the content type or the file size?

Something like Paperclip's approach would be great!

<pre><code> validates_attachment_content_type :logo, content_type: /\Aimage\/.*\Z/
 validates_attachment_size :logo, less_than: 1.megabytes
</code></pre>

ActiveStorage File Attachment Validation

身份验证

有没有办法用ActiveStorage验证附件？例如，如果我想验证内容类型或文件大小？像回形针这样的方法就太棒了！  validates_attachment_content_type :logo, content_type: /\Aimage\/.*\Z/  validates_attachment_size :logo, less_than: 1.megabytes

问ActiveStorage文件附件验证
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