prawn | Fast , Nimble PDF Writer for Ruby | Document Editor library

I am more of a Java programmer and still somewhat new to development (2 years or so, can write Java code & web apps just fine) however the company I work for has 4 Rails applications and was asked to get this application working called CtrlPanel. I have been having to learn Ruby on Rails in order to help get this issue with this app fixed and get it working.

I have been working on this problem for over a week all day long every day and nothing I do is fixing it.

I fixed everything to the point the app comes up, web server runs serves the pages but all views are white screens as long as this application.html.haml file is present. I re-wrote the file with very basic bootstrap and it sort of works but nothing looks right. The problem seems to stem from 1 single like that simply says: = javascript_include_tag "application"

I have been all over the internet and have tried every single fix from changing coffee-script-source to v1.8.0 as I read Windows has an issue with newer rails and that file, I have tried every variation of changing it from application to default, and every type of ending you can think of no matter what I do it gives me this error message which I can not seem to find.

I am not even sure WHAT that line does, I assume it has to do with the new Google Maps API and I verified the key is valid and it was working before.

This is the error is it giving it says the line with "= javascript_include_tag" "application" giving error ExecJS::RuntimeError at / SyntaxError: [stdin]:1:1: unexpected //=

I am running a PC on Windows 10 20H2 x64 UEFI ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x64-mingw32] Rails 6.1.3

(I did also install Ubuntu on another machine and it gives the exact same error, also gives the same error on another Windows machine)

The app is working IF I delete the "application.html.haml" file and put in a skeleton basic version all of the other views start working but of course none of them look right no menus no bootstrap no nothing.
Here is the application.html.haml file.

In my view method, my selected dropdown like this. My problem are:-

1. How do I retrieve data from a database if I'm using the dropdown field? (Update Method)

2. How do I want to make the dropdown selected? (Validation & Show Method)

   ...

I'm using gem prawn for PDF generation. I want to create table using that gem to do so I'm gonna use make_cell from that gem, as follow:

In CashTransaction model I've got default scope:

I create a table of cash transactions inside of PDF using Prawn gem. To do so I iterate through the Hash with parsed_cash_transactions but before each is started I need to save the last_item of that Hash to check when I should display the summary table below the main table.

I am trying to setup a project that uses rails 2.3.2. In my Gemfile I have gem "rails", "2.3.2". Running bundle install outputs Using rails 2.3.2. When I try to run any rails commands, in this case rails s I get a load error.

I'm using Ruby for scripting, and Prawn-labels to print ISBN labels for books, using Barby to generate the EAN-13 bar codes.

The ISBNs come out of MySQL. That works fine. I can create a PDF of 30-up labels containing the titles of the books, using Prawn/labels. That works fine.

However, I am not having much joy putting a Barby-generated PNG image of the proper EAN-13 barcode on the label.

Here's getting the info out of the database and generating EAN-13, pretty straightforward:

I use gem prawn to generate pdf file. I want to have horizontal line 105 mm from top, 1pt line, #000. I've set left margin and top margin (I need it in the rest of the pdf) as follow:

I'm using Prawn gem to generate the PDF file (A4 format). I want to have two horizontal lines/folding marks which should be available: 105 mm from top of the document, 1pt line, #000. From what I know I could call something like: