Itinerary | Lazy time scheduling toolset for .NET | Job Scheduling library

I am new with Django and coding. After doing Local Library and Polls tutorial on MDN and Django respectively. I am now working on travel itinerary app. Where I want that my model should be able to take start date as enter by user and based on number of nights selected by user should auto fill the end date.

Example: Start Date: 09-July-21 No. of Nights: 05 End Date: 14-July-21

Code for models.py is as follows, I will be using Postgresql DB for this project

I am trying to generate artifacts for Sabre Retrieve Itinerary.

This is the script I am using:

Need help to with a query below to return rows of following XML nested nodes. Some of column's data require to return multiple values (as exist in XML script) with comma separated e.g. nodes 'BillType', 'BillNumber', 'CONTAINER_NUMBER' or 'CONTAINER_STATUS' etc..

Thanks in Advance.

XML...

We are working with sabre APIs such as CreateSessionRQ, GetReservationRQ, AddRemarksRQ, EndTransactionRQ, CloseSessionRQ. we have gotton the reservation details using PNR locator through GetReservationRQ after creating the session with CreateSessionRQ. We have the following doubts:

1. While sending the request to AddRemarksRQ and EndTransactionRQ, there is no PNR is added to the request. We don't find the PNR locator in the sample request provided in the sabre developer website. How the PNR is associated with both the request ?
2. In the preconditions of EndTransactionRQ API, they are mentioned as 'a PNR with at least one itinerary segment must be in the Sabre work area'. Can anyone explain this?

Hoping to get some help based on below initial values. This is just a snippet of my data but I am trying to perform a Formik FieldArray at the itinerary level, nested three levels deep but unsure what the name to assign for this FieldArray name.

I'm struggling trying to make a GetxController work with a SliverList. In particular, my controller returns the view state with StateMixin from Getx library.

I've an issue: In my angular app, I'm using a lot of classes with inheritance, but I just noticed that when trying to save those objects to firebase, I get an error saying that I'm trying to persist some customs objects and that isn't supported.

Here is the error:

I want map Origin.CityId and Origin.StateId properties of Itinerary class to OriginCityId and OriginStateId properties of ItineraryModel class.

Ex: Itinerary itinerary = Mapper.Map(ItineraryModel);

My ViewModel

I've some typescript classes instances in my angular app that I've to save to firebase. Firebase isn't supporting custom classes, so I found this: https://github.com/typestack/class-transformer that seems well fitted for me.

So now I'm creating my object, and trying to convert it.

Here is my object.