error on Magick

[a manhood]

Dear all,

I can not convert the pdf to jpgs by Magick (ruby on rails)

Magick::Image::read('public/uploads/ebook/pdf/5/facebook-marketing-update-spring-2011.pdf').each_with_index { |img, i|

    img.resize_to_fit!(800, 1000)

  img.write("public/uploads/ebook/pdf/5/facebook-marketing-update-spring-2011.pdf-#{i}.jpg") {

  self.quality = 80

  }

 }

The above codes work well.

However, when i change to below code, it shows no decode delegate for this image format `public/#{@ebook.pdf.to_s}' @ error/constitute.c/ReadImage/532

 def create

    @ebook = Ebook.new(params[:ebook])

    respond_to do |format|

      if @ebook.save

Magick::Image::read('public/#{@ebook.pdf.to_s}').each_with_index { |img, i|

 img.resize_to_fit!(800, 1000)

 bookpage = Bookpage.new

 bookpage.ebook_id = @ebook.id

 bookpage.name = "#{@ebook.pdf}-#{i}.jpg"

 bookpage.page_no = i + 1

 bookpage.save

 img.write("public/#{@ebook.pdf}-#{i}.jpg") {

   self.quality = 120

 }

}

        format.html { redirect_to @ebook, notice: 'Ebook was successfully created.' }

        format.json { render json: @ebook, status: :created, location: @ebook }

      else

        format.html { render action: "new" }

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

      end

    end

  end

the @ebook.pdf = uploads/ebook/pdf/5/facebook-marketing-update-spring-2011.pdf

Could you please teach me how to solve it ? i have on ideas what's error. Some articles showed me to install something on imagemagick.

Thanks,

Alex

[Matthew Rudy Jacobs]

Take a look at the error.
The answer is pretty clear.

Your variable is not being interpolated.

Take a look at the rules for ruby strings and when they will or will not interpolate variables.

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