@pkouame , we are checking the issue now.
so try to implement it for now with the links provided by @gterdem. if you fall into any blocking case, we can help you on that.
if the aspnetboilerplate implementation doesn't help you, we can write a doc about this usage, but this can be in v3.0 or in v3.1.
@pkouame,
See this to understand how to use RegEx in String
properties => https://support.abp.io/QA/Questions/271/How-to-use-RegEx-in-Suite
Also there doesn't seem to be problem for nullable fields. You cannot set a String field nullable, because strings are already nullable, you can set other fields as nullable or not nullable.
For your further questions, could you please create a new ticket, because this thread is only for reproduced bugs.
How can I use regular expression (RegEx)?
if you are trying to set a String property as nullable, you cannot do that. String is a reference type and always nullable,
ABP is different than the Zero project. In ABP almost everything is module. And these modules are referenced as NuGet packages. So it's very easy to upgrade. Actually making a new module for your business is good but you don't need to create modules for your sub applications. If you want to seperate a sub application via microservice then it's OK but if you'll not seperate it from the main application, just develop it in the main project.
@buaziz did you ask question or is it a way of how you do upgrade?