Document using sub classes to differentiate versions of a resource (and why)

[meadsteve]

So why not have named based injection? TLDR because I want to make it easier to find usages of a thing in tools like IDEs. This can be hard when relying on magic string names.

class Database:
   ...

class PrimaryDb(Database)
   pass

class ReadReplica(Database):
   pass

With this system classes can be explicit about which kind of database access they need in a way that code analysis tools can understand.

[meadsteve]

This type of issue was relevant for the galaxy project's use of lagom: galaxyproject/galaxy#12931 (comment)