short_url | web application framework with expressive , elegant syntax

My hope is to validate an input field (PromoCode) prior to form submission. @Adrian J. Moreno pointed me to "The Remember The Milk sign-up form" (https://jqueryvalidation.org/files/demo/milk/) and @SOS has walked me through the process to this point.

I’ve got everything working (sort of) except grabbing the PromoCode from the DB (it’s currently hardcoded in the .cfc file.)

The site is for my brother who teaches multiple training courses and asked if I can add a promo code option to the registration form. He has several courses so there may be several promo codes (different for each possible course.)

I have 2 questions:

1. How do I grab the PromoCode for each course from SQL to compare to what the user types?
2. As indicated above, I’ve got everything else working except, currently, if the user types a wrong promo code it tells them it’s invalid as expected… BUT the user cannot submit the form unless they clear the field or enter the proper code. I’d like the user to be able to submit the form regardless of whether the PromoCode is valid or not. If it IS valid, they get the discount… if not, they don’t.

Here’s the stripped down code. I can provide the full code if necessary.

I'd like a single nginx rewrite rule, hopefully in one line of code because I have to make a bunch of these, that can match and redirect either of these:

I have old URL path for all pages

I started getting an error like below in my flutter project. can you help me?

My Code :

I am creating URL Shortener Microservice application.I have a mongodb cluster that i save my all url links. I am successfully connect to database.I am making post request to save my posted url. Related code is here

When i try go to http://127.0.0.1:8000/1395ec37e4/ i get error: Page not found at ... I don't know why, twice, when i had changed variable getted_short_url to short_urlin urls.py and views.py(redirect_view) it could redirect me. I am confused...

Log from page:

I need to check if a given tweet contains or not alt_text.

I'm trying with API.get_status operation, which, according to its documentation contains a parameter to include alt_text:

include_ext_alt_text – If alt text has been added to any attached media entities, this parameter will return an ext_alt_text value in the top-level key for the media entity.

However, all I get is:

I have 5 links with tooltip hovers on each one except the last one. The reason the last one is different is because I'm using the tooltip to show the user their data was copied after the link was clicked. I would still like to have a hover for that link like the other ones that tells the user what the button does before they click it. I've included a sample below. I'd appreciate it if someone could help me figure out how to add the hover tool tip on the last link as well as having it still say "copied" after it was clicked.

I am learning to design systems. First use case is URL shortening service. I have read that we can store short_url,long_url pair in RDBMS. Since as per the requirement, we should be able to map a short_url to long_url (so that this can be sent to calling client) and also from long_url to short_url (so that existing mapped long_urls are not shortened again). My question is how these mappings/look-ups are efficiently done in RDBMS. Straightforward answer would be that index on short_url as well as index on long_url is maintained. I would like to explore its details like generally what indexing techniques in both cases are done in RDBMS.