Paperclip::Errors::MissingRequiredValidatorError with Rails 4
paperclip, ruby, ruby-on-rails, ruby-on-rails-4
Solution
Starting with `Paperclip version 4.0`, all attachments are required to include a content_type validation, a file_name validation, or to explicitly state that they're not going to have either.
Paperclip raises `Paperclip::Errors::MissingRequiredValidatorError` error if you do not do any of this.
In your case, you can add any of the following line to your `Post` model, after specifying `has_attached_file :image`
Option 1: Validate content type
validates_attachment_content_type :image, :content_type => ["image/jpg", "image/jpeg", "image/png", "image/gif"]
-OR- another way
validates_attachment :image, content_type: { content_type: ["image/jpg", "image/jpeg", "image/png", "image/gif"] }
-OR- yet another way
is to use regex for validating content type.
For example: To validate all image formats, regex expression can be specified as shown in
@LucasCaton's answer
Option 2: Validate filename
validates_attachment_file_name :image, :matches => [/png\Z/, /jpe?g\Z/, /gif\Z/]
Option 3: Do not validate
If for some crazy reason (can be valid but I cannot think of one right now), you do not wish to add any `content_type` validation and allow people to spoof Content-Types and receive data you weren't expecting onto your server then add the following:
do_not_validate_attachment_file_type :image
Note:
Specify the MIME types as per your requirement within `content_type`/ `matches` options above. I have just given a few image MIME types for you to start with.
Reference:
Refer to Paperclip: Security Validations, if you still need to verify. :)
You might also have to deal with the spoofing validation explained here https://stackoverflow.com/a/23846121
Problem
I'm getting this error when I try to upload using paperclip with my rails blogging app. Not sure what it is referring to when it says "MissingRequiredValidatorError" I thought that by updating post_params and giving it :image it would be fine, as both create and update use post_params ``` Paperclip::Errors::MissingRequiredValidatorError in PostsController#create Paperclip::Errors::MissingRequiredValidatorError Extracted source (around line #30): def create @post = Post.new(post_params) ``` This is my posts_controller.rb ``` def update @post = Post.find(params[:id]) if @post.update(post_params) redirect_to action: :show, id: @post.id else render 'edit' end end def new @post = Post.new end def create @post = Post.new(post_params) if @post.save redirect_to action: :show, id: @post.id else render 'new' end end #... private def post_params params.require(:post).permit(:title, :text, :image) end ``` and this is my posts helper ``` module PostsHelper def post_params params.require(:post).permit(:title, :body, :tag_list, :image) end end ``` Please let me know if I can supplement extra material to help you help me.