how to get data from one collect to selectlist and show the request result in right way? Please review my workflow below and give me guide. Thanks.
Most probably SelectList is not appropriate element for your case.
It has Option model and usually used for some set of predefined options.
If you need to use any database model and get data from backend - try to replace it to Select Custom element.
Thanks. It is not easy to understand how to find the right function and set up the right workflow.