blocks|key|218104|text|目前，您必须编写自己的验证器来查看附件的MIME类型：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218105|class+Item
++has_one_attached+:document

++validate+:correct_document_mime_type

++private

++def+correct_document_mime_type
++++if+document.attached?+&&+!document.content_type.in?(%25w(application/msword+application/pdf))
++++++document.purge+#+delete+the+uploaded+file
++++++errors.add(:document,+'Must+be+a+PDF+or+a+DOC+file')
++++end
++end
end|code-block|syntax|javascript|218106|此外，还有一些有用的快捷方法image?、audio?、video?和text?可以检查多种mime类型。|offset|length|style|CODE|218107|entityMap^0|0|0|E|6|L|6|S|6|Z|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|N|$]]

Currently you have to write your own validator which looks at the attachment's MIME type:

<pre><code>class Item
 has_one_attached :document

 validate :correct_document_mime_type

 private

 def correct_document_mime_type
 if document.attached? &amp;&amp; !document.content_type.in?(%w(application/msword application/pdf))
 document.purge # delete the uploaded file
 errors.add(:document, 'Must be a PDF or a DOC file')
 end
 end
end
</code></pre>

Also, there are some useful shortcut methods <code>image?</code>, <code>audio?</code>, <code>video?</code> and <code>text?</code> that check against multiple mime types.

blocks|key|521993|text|有一个gem可为主动存储提供验证|type|unstyled|depth|inlineStyleRanges|entityRanges|data|521994|gem+'activestorage-validator'|code-block|syntax|javascript|521995|https://github.com/aki77/activestorage-validator|offset|length|521996|++validates+:avatar,+presence:+true,+blob:+{+content_type:+:image+}
++validates+:photos,+presence:+true,+blob:+{+content_type:+['image/png',+'image/jpg',+'image/jpeg'],+size_range:+1..5.megabytes+}|521997|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1C|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@$I|W|J|X|1|Y]]|A|$]]|$1|K|3|L|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|H]]]]

there is a gem which provides validation for active storage

<pre><code>gem 'activestorage-validator'
</code></pre>

<a href="https://github.com/aki77/activestorage-validator" rel="noreferrer">https://github.com/aki77/activestorage-validator</a>

<pre><code> validates :avatar, presence: true, blob: { content_type: :image }
 validates :photos, presence: true, blob: { content_type: ['image/png', 'image/jpg', 'image/jpeg'], size_range: 1..5.megabytes }
</code></pre>

blocks|key|218109|text|因为ActiveStorage还没有验证，所以我发现在我的表单中有以下帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|218110|<div+class="field">
++<%25=+f.label+:deliverable+%25>
++<%25=+f.file_field+:deliverable,+direct_upload:+true,+
++++accept:+'application/pdf,+
++++application/zip,application/vnd.openxmlformats-officedocument.wordprocessingml.document'+%25>
+</div>|code-block|syntax|javascript|218111|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|$]]

Since ActiveStorage doesn't have validations yet, I found the following helps in my forms.

<pre><code>&lt;div class="field"&gt;
 &lt;%= f.label :deliverable %&gt;
 &lt;%= f.file_field :deliverable, direct_upload: true, 
 accept: 'application/pdf, 
 application/zip,application/vnd.openxmlformats-officedocument.wordprocessingml.document' %&gt;
 &lt;/div&gt;
</code></pre>

blocks|key|521999|text|我在看https://gist.github.com/lorenadl/a1eb26efdf545b4b2b9448086de3961d|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|522000|在你看来，你必须这样做|522001|<div+class="field">
++<%25=+f.label+:deliverable+%25>
++<%25=+f.file_field+:deliverable,+direct_upload:+true,+
++++accept:+'application/pdf,+
++++application/zip,application/vnd.openxmlformats-officedocument.wordprocessingml.document'+%25>
+</div>|code-block|syntax|javascript|522002|现在在你的模型上，你可以这样做|522003|class+User+<+ApplicationRecord
++has_one_attached+:document

++validate+:check_file_type

++private

++def+check_file_type
++++if+document.attached?+&&+!document.content_type.in?(%25w(application/msword+application/pdf))
++++++document.purge+#+delete+the+uploaded+file
++++++errors.add(:document,+'Must+be+a+PDF+or+a+DOC+file')
++++end
++end
end|522004|我希望这对你有所帮助。|522005|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/lorenadl/a1eb26efdf545b4b2b9448086de3961d^0|3|1T|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I was looking at <a href="https://gist.github.com/lorenadl/a1eb26efdf545b4b2b9448086de3961d" rel="nofollow noreferrer">https://gist.github.com/lorenadl/a1eb26efdf545b4b2b9448086de3961d</a> 

and it looks like on your view you have to do something like this 

<pre><code>&lt;div class="field"&gt;
 &lt;%= f.label :deliverable %&gt;
 &lt;%= f.file_field :deliverable, direct_upload: true, 
 accept: 'application/pdf, 
 application/zip,application/vnd.openxmlformats-officedocument.wordprocessingml.document' %&gt;
 &lt;/div&gt;
</code></pre>

Now on your model, you can do something like this 

<pre><code>class User &lt; ApplicationRecord
 has_one_attached :document

 validate :check_file_type

 private

 def check_file_type
 if document.attached? &amp;&amp; !document.content_type.in?(%w(application/msword application/pdf))
 document.purge # delete the uploaded file
 errors.add(:document, 'Must be a PDF or a DOC file')
 end
 end
end
</code></pre>

I hope that this helps

blocks|key|885275|text|class+Book+<+ApplicationRecord
++has_one_attached+:image
++has_many_attached+:documents

++validate+:image_validation
++validate+:documents_validation

++def+documents_validation
++++error_message+=+''
++++documents_valid+=+true
++++if+documents.attached?
++++++documents.each+do+%7Cdocument%7C
++++++++if+!document.blob.content_type.in?(%25w(application/xls+application/odt+application/ods+pdf+application/tar+application/tar.gz+application/docx+application/doc+application/rtf+application/txt+application/rar+application/zip+application/pdf+image/jpeg+image/jpg+image/png))
++++++++++documents_valid+=+false
++++++++++error_message+=+'The+document+wrong+format'
++++++++elsif+document.blob.byte_size+>+(100+*+1024+*+1024)+&&+document.blob.content_type.in?(%25w(application/xls+application/odt+application/ods+pdf+application/tar+application/tar.gz+application/docx+application/doc+application/rtf+application/txt+application/rar+application/zip+application/pdf+image/jpeg+image/jpg+image/png))
++++++++++documents_valid+=+false
++++++++++error_message+=+'The+document+oversize+limited+(100MB)'
++++++++end
++++++end
++++end
++++unless+documents_valid
++++++errors.add(:documents,+error_message)
++++++self.documents.purge
++++++DestroyInvalidationRecordsJob.perform_later('documents',+'Book',+self.id)
++++end
++end

++def+image_validation
++++if+image.attached?
++++++if+!image.blob.content_type.in?(%25w(image/jpeg+image/jpg+image/png))
++++++++image.purge_later
++++++++errors.add(:image,+'The+image+wrong+format')
++++++elsif+image.blob.content_type.in?(%25w(image/jpeg+image/jpg+image/png))+&&+image.blob.byte_size+>+(5+*+1024+*+1024)+#+Limit+size+5MB
++++++++image.purge_later
++++++++errors.add(:image,+'The+image+oversize+limited+(5MB)')
++++++end
++++elsif+image.attached?+==+false
++++++image.purge_later
++++++errors.add(:image,+'The+image+required.')
++++end
++end
end|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|885276|在工作毁灭中|unstyled|885277|class+DestroyInvalidationRecordsJob+<+ApplicationJob
++queue_as+:default

++def+perform(record_name,+record_type,+record_id)
++++attachments+=+ActiveStorage::Attachment.where(name:+record_name,+record_type:+record_type,+record_id:+record_id)
++++attachments.each+do+%7Cattachment%7C
++++++blob+=+ActiveStorage::Blob.find(attachment.blob_id)
++++++attachment.destroy
++++++blob.destroy+if+blob.present?
++++end
++end
end|885278|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>class Book &lt; ApplicationRecord
 has_one_attached :image
 has_many_attached :documents

 validate :image_validation
 validate :documents_validation

 def documents_validation
 error_message = ''
 documents_valid = true
 if documents.attached?
 documents.each do |document|
 if !document.blob.content_type.in?(%w(application/xls application/odt application/ods pdf application/tar application/tar.gz application/docx application/doc application/rtf application/txt application/rar application/zip application/pdf image/jpeg image/jpg image/png))
 documents_valid = false
 error_message = 'The document wrong format'
 elsif document.blob.byte_size &gt; (100 * 1024 * 1024) &amp;&amp; document.blob.content_type.in?(%w(application/xls application/odt application/ods pdf application/tar application/tar.gz application/docx application/doc application/rtf application/txt application/rar application/zip application/pdf image/jpeg image/jpg image/png))
 documents_valid = false
 error_message = 'The document oversize limited (100MB)'
 end
 end
 end
 unless documents_valid
 errors.add(:documents, error_message)
 self.documents.purge
 DestroyInvalidationRecordsJob.perform_later('documents', 'Book', self.id)
 end
 end

 def image_validation
 if image.attached?
 if !image.blob.content_type.in?(%w(image/jpeg image/jpg image/png))
 image.purge_later
 errors.add(:image, 'The image wrong format')
 elsif image.blob.content_type.in?(%w(image/jpeg image/jpg image/png)) &amp;&amp; image.blob.byte_size &gt; (5 * 1024 * 1024) # Limit size 5MB
 image.purge_later
 errors.add(:image, 'The image oversize limited (5MB)')
 end
 elsif image.attached? == false
 image.purge_later
 errors.add(:image, 'The image required.')
 end
 end
end
</code></pre>

And in job Destroy

<pre><code>class DestroyInvalidationRecordsJob &lt; ApplicationJob
 queue_as :default

 def perform(record_name, record_type, record_id)
 attachments = ActiveStorage::Attachment.where(name: record_name, record_type: record_type, record_id: record_id)
 attachments.each do |attachment|
 blob = ActiveStorage::Blob.find(attachment.blob_id)
 attachment.destroy
 blob.destroy if blob.present?
 end
 end
end
</code></pre>

blocks|key|885280|text|我在用ActiveStorage做直接上传。由于验证器还不存在，我只是简单地重写了DirectUploadsController+Create方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|885281|#+This+is+a+kind+of+monkey+patch+which+overrides+the+default+create+so+I+can+do+some+validation.
#+Active+Storage+validation+wont+be+released+until+Rails+6.
class+DirectUploadsController+<+ActiveStorage::DirectUploadsController
++def+create
++++puts+"Do+validation+here"
++++super
++end
end|code-block|syntax|javascript|885282|还需要覆盖路由：|885283|++post+'/rails/active_storage/direct_uploads',+to:+'direct_uploads#create'|885284|entityMap^0|15|U|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

I was doing direct uploads with ActiveStorage. Since validators don't exist yet I simply overwrote the <code>DirectUploadsController Create</code> method:

<pre><code># This is a kind of monkey patch which overrides the default create so I can do some validation.
# Active Storage validation wont be released until Rails 6.
class DirectUploadsController &lt; ActiveStorage::DirectUploadsController
 def create
 puts "Do validation here"
 super
 end
end
</code></pre>

also need to overwrite the route:

<pre><code> post '/rails/active_storage/direct_uploads', to: 'direct_uploads#create'
</code></pre>

blocks|key|979528|text|%2B1用于在ActiveStorage中使用gem+'activestorage-validator'|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|979529|在您的模型中，您可以通过以下方式验证doc、docx和pdf格式：|979530|has_one_attached+:cv
validates+:cv,+blob:+{+content_type:+['application/msword',+'application/vnd.openxmlformats-officedocument.wordprocessingml.document',+'application/pdf'],+size_range:+0..5.megabytes+}|code-block|syntax|javascript|979531|entityMap^0|L|T|0|I|3|M|4|R|3|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

+1 for using <code>gem 'activestorage-validator'</code> with ActiveStorage

In your model you can validate <code>doc</code>, <code>docx</code> and <code>pdf</code> formats this way:

<pre><code>has_one_attached :cv
validates :cv, blob: { content_type: ['application/msword', 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/pdf'], size_range: 0..5.megabytes }
</code></pre>

blocks|key|522016|text|仅仅添加几行代码的gem并不总是需要的。这是一个基于上述示例的小改动的工作示例。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|522017|validate+:logo_content_type,+if:+->+{+logo.attached?+}


def+logo_content_type
++allowed+=+%25w[image/jpeg+image/jpeg+image/webp+image/png]
++if+allowed.exclude?(logo.content_type)
++++errors.add(:logo,+message:+'Logo+must+be+a+JPG,+JPEG,+WEBP+or+PNG')
++end
end|code-block|syntax|javascript|522018|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|$]]

Adding a gem for just a few lines of code is not always needed. Here's a working example based on a small alteration on the example above.
<pre class="lang-rb prettyprint-override"><code>validate :logo_content_type, if: -&gt; { logo.attached? }


def logo_content_type
 allowed = %w[image/jpeg image/jpeg image/webp image/png]
 if allowed.exclude?(logo.content_type)
 errors.add(:logo, message: 'Logo must be a JPG, JPEG, WEBP or PNG')
 end
end
</code></pre>

Is it possible to add a validation to accept only .pdf and .doc files using Active Storage?

Ruby on Rails - Active Storage - how to accept only pdf and doc?

是否可以添加验证以仅接受使用活动存储的.pdf和.doc文件？

问Ruby on Rails - Active Storage -如何只接受pdf和doc？
EN

回答 8

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