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Transactor lens to preserve transactor type #2346

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aa5a094
update strategy related lenses to preserve transactor type.
sharmaakshay177 Nov 18, 2025
9e65ad1
Merge branch 'typelevel:main' into transactor_before_lens_preserve_type
sharmaakshay177 Nov 19, 2025
92cb191
update strategy related lenses to preserve transactor type.
sharmaakshay177 Nov 21, 2025
5361a62
Merge remote-tracking branch 'origin/transactor_before_lens_preserve_…
sharmaakshay177 Nov 21, 2025
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10 changes: 5 additions & 5 deletions modules/core/src/main/scala/doobie/util/transactor.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -300,19 +300,19 @@ object transactor {
def interpret[M[_]]: Transactor[M] `Lens` Interpreter[M] = Lens(_.interpret, (a, b) => a.copy(interpret0 = b))

/** @group Lenses */
def strategy[M[_]]: Transactor[M] `Lens` Strategy = Lens(_.strategy, (a, b) => a.copy(strategy0 = b))
def strategy[M[_], A]: Transactor.Aux[M, A] `Lens` Strategy = Lens(_.strategy, (a, b) => a.copy(strategy0 = b))

/** @group Lenses */
def before[M[_]]: Transactor[M] `Lens` ConnectionIO[Unit] = strategy[M] >=> Strategy.before
def before[M[_], A]: Transactor.Aux[M, A] `Lens` ConnectionIO[Unit] = strategy[M, A] >=> Strategy.before

/** @group Lenses */
def after[M[_]]: Transactor[M] `Lens` ConnectionIO[Unit] = strategy[M] >=> Strategy.after
def after[M[_], A]: Transactor.Aux[M, A] `Lens` ConnectionIO[Unit] = strategy[M, A] >=> Strategy.after

/** @group Lenses */
def oops[M[_]]: Transactor[M] `Lens` ConnectionIO[Unit] = strategy[M] >=> Strategy.oops
def oops[M[_], A]: Transactor.Aux[M, A] `Lens` ConnectionIO[Unit] = strategy[M, A] >=> Strategy.oops

/** @group Lenses */
def always[M[_]]: Transactor[M] `Lens` ConnectionIO[Unit] = strategy[M] >=> Strategy.always
def always[M[_], A]: Transactor.Aux[M, A] `Lens` ConnectionIO[Unit] = strategy[M, A] >=> Strategy.always

/** Construct a constructor of `Transactor[M, D]` for some `D <: DataSource` When calling this constructor you
* should explicitly supply the effect type M e.g. Transactor.fromDataSource[IO](myDataSource, connectEC)
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4 changes: 2 additions & 2 deletions modules/example/src/main/scala/example/StreamingCopy.scala
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Expand Up @@ -87,9 +87,9 @@ object StreamingCopy extends IOApp.Simple {
HC.delay(Console.println(s"$tag: $s")) <* _

/** Derive a new transactor that logs stuff. */
def addLogging[F[_], A](name: String)(xa: Transactor[F]): Transactor[F] = {
def addLogging[F[_], A](name: String)(xa: Transactor.Aux[F, A]): Transactor.Aux[F, A] = {
import Transactor.* // bring the lenses into scope
val update: State[Transactor[F], Unit] =
val update: State[Transactor.Aux[F, A], Unit] =
for {
_ <- before %= printBefore(name, "before - setting up the connection")
_ <- after %= printBefore(name, "after - committing")
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