How to detect Transaction?

[aldycool]

Hi,

I'm currently building a library that works on top of Moor. One of my function is to execute several Moor's methods atomically, such as select(table).getSingle() and continued with into(table).insert(), naturally a Transaction will be used here to guarantee the atomic result. I need to check whether my function calls are wrapped inside a Transaction or not, and will raise an error if it isn't. So, how to detect if a certain database subclass (subclassed from GeneratedDatabase like the standard example) is already running inside Transaction? I cannot seem to find this in the official documentation, or in the issues. Thanks!

EDIT: At the moment, I found a (hackish) way of doing this like the following:

  bool inTransaction() {
    return Zone.current[#DatabaseConnectionUser]
        .toString()
        .contains("Transaction");
  }

In the mean time I'll stick with this way, unless there are more "official" way of doing this. Thanks!

[simolus3]

I think your approach is reasonable. Whether something is running in a transaction or not is not currently exposed by moor's public api, but I'll take a look at adding that information.

[simolus3]

I've made the information a bit more public in 159656b. You can use resolvedEngine is Transaction to detect whether the current context is in a transaction or not.
I've currently flagged it as @internal since I'm not entirely convinced if this is an appropriate way to expose that information. But you can ignore the lint and just use this, I wont change it before a breaking release.

[aldycool]

Alright, I think by checking the resolvedEngine feels more "concrete". Thank you for your consideration.