Run Transactions with Functions

The first way to run Repo.transaction is to pass in a function containing the operations we’d like to run within the transaction. This can be an anonymous function or a named function defined elsewhere. This seems like a good idea—we’re functional programmers, and this approach will let us keep using functions. Let’s try it out.

The working of Repo.transaction

To illustrate how this works, we will introduce a new database table and a module to go with it. Imagine that we’ve decided that we want to ...