Unexpected token when trying to upload image

[Alex Deering]

Im trying to get shrine to work to upload an image and when I submit the form I get a json parse error

JSON::ParserError in RecipesController#update
743:unexpected token at'shakshuka.jpg'

Here is my ImageUploader:

require "image_processing/mini_magick"

class ImageUploader < Shrine

include ImageProcessing::MiniMagick

  plugin :determine_mime_type

  plugin :logging, logger: Rails.logger

  plugin :remove_attachment

  plugin :store_dimensions

  plugin :versions, names: [:original, :thumb]

  plugin :backgrounding

  def process(io, context)

        case context[:phase]

        when :store

      thumb = resize_to_limit!(io.download, 200, 200)

      { original: io, thumb: thumb }

        end

  end

end

And my recipes controller update function:

def update

    respond_to do |format|

      if @recipe.update(recipe_params)

        format.html { redirect_to @recipe, notice: 'Recipe was successfully updated.' }

        format.json { render :show, status: :ok, location: @recipe }

      else

        format.html { render :edit }

        format.json { render json: @recipe.errors, status: :unprocessable_entity }

      end

    end

  end

My Shrine initializer:

require "shrine"

require "shrine/storage/s3"

s3_options = {

  access_key_id:     ENV.fetch('AWS_ACCESS_KEY_ID'),

  secret_access_key: ENV.fetch('AWS_SECRET_ACCESS_KEY'),

  region:            'us-west-2',

  bucket:            ENV.fetch('S3_BUCKET_NAME')

}

Shrine.storages = {

  cache: Shrine::Storage::S3.new(prefix: "cache", **s3_options),

  store: Shrine::Storage::S3.new(prefix: "store", **s3_options),

}

Shrine.plugin :activerecord

Shrine.plugin :cached_attachment_data

Ive added the uploader in my model like this:

include ImageUploader[:image]

I think that is everything involved but not sure what is causing the error

[Janko Marohnić]

Hey Alex,

This error looks like that it's caused by the HTML form not having the enctype="multipart/form-data" attribute, could that be the issue? Rails' form builder should automatically add it for you when you add a file field, but if you're writing the form explicitly you have to add it directly.

Kind regards,
Janko

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[Alex Deering]

Ok, I was using simple form and forgot to add the multipart on there.  However now I get this error:

The `file` command-line tool is not installed

[Janko Marohnić]

This is coming from the determine_mime_type plugin. By default it tries to use the `file` command-line utility, which is installed in most OSes, but in your case it seems to be missing.

You could either try to install it, or tell the determine_mime_type plugin to use the MimeMagic gem instead (in that case you need to add `gem "mimemagic"` to your Gemfile):

plugin :determine_mime_type, analyzer: :mimemagic

Kind regards,
Janko

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[Alex Deering]

Thanks for the quick replies...for now I just removed that plugin as I dont need it, but will look into figuring out why I dont have the file command-line utility (im working in a virtual machine so that might be why)

[mmari...@gmail.com]

I, too am having a similar error: 784: unexpected token at '#<ImageUploader::UploadedFile:0x007fecf2080520>'

This happens when I try to update the model without uploading an image. Here's a full stack trace: http://pastebin.com/XkWkiVUN. The data that gets passed to the avatar param: "avatar"=>"#<ImageUploader::UploadedFile:0x007fecf2080520>"},

 <%= f.input :avatar, as: :hidden, value: @user.cached_avatar_data %>

 <%= f.input :avatar, as: :file %>

I'm using simple_form and the form has the multipart attr. 

[Janko Marohnić]

SimpleForm actually accepts the value through the `:input_html` option:

<%= f.input :avatar, as: :hidden, input_html: {value: @user.cached_avatar_data} %>

Since SimpleForm didn't detect the given value, it went ahead and used the value that `@photo.image` returns, which is a Shrine::UploadedFile object, and converted it into a string.

Kind regards,

Janko

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