Render and combine PDF files into one

Render PDF files from HTML templates in Rails can be done using WickedPDF.

First you need to use ActionView to render HTML to a string:

 def render_to_string(data) action_view = ActionView::Base.new action_view.view_paths = ActionController::Base.view_paths action_view.class_eval do include ApplicationHelper include PDFHelper # or other helpers end action_view.render template: 'pdf/template.html', layout: 'layout/pdf.html', locals: { data: data } end 

Then you can render pdf with the desired settings like this:

 # first pdf file with some view settings and values from data1... pdf1 = WickedPdf.new.pdf_from_string( render_to_string(data1), { pdf: 'report1', page_size: 'Letter', orientation: 'Portrait' }) # ...and second pdf file with some view settings and values from data2 pdf2 = WickedPdf.new.pdf_from_string( render_to_string(data2), { pdf: 'report2', page_size: 'Letter', orientation: 'Landscape' }) 

And now you can combine it with CombinePDF gem, that provide you parse method to get PDF content and to_pdfmethod to render the result back to PDF.

 combiner = CombinePDF.new combiner << CombinePDF.parse(pdf1) combiner << CombinePDF.parse(pdf2) combiner.to_pdf