Studio Tagger (#3510)

* Studio image and parent studio support in scene tagger
* Refactor studio backend and add studio tagger
---------
Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

pkg/models/update.go

@@ -5,6 +5,7 @@ import (
 	"io"
 	"strconv"
 
+	"github.com/stashapp/stash/pkg/sliceutil"
 	"github.com/stashapp/stash/pkg/sliceutil/intslice"
 )
 
@@ -94,16 +95,7 @@ func (u *UpdateIDs) EffectiveIDs(existing []int) []int {
 		return nil
 	}
 
-	switch u.Mode {
-	case RelationshipUpdateModeAdd:
-		return intslice.IntAppendUniques(existing, u.IDs)
-	case RelationshipUpdateModeRemove:
-		return intslice.IntExclude(existing, u.IDs)
-	case RelationshipUpdateModeSet:
-		return u.IDs
-	}
-
-	return nil
+	return effectiveValues(u.IDs, u.Mode, existing)
 }
 
 type UpdateStrings struct {
@@ -118,3 +110,26 @@ func (u *UpdateStrings) Strings() []string {
 
 	return u.Values
 }
+
+// GetEffectiveIDs returns the new IDs that will be effective after the update.
+func (u *UpdateStrings) EffectiveValues(existing []string) []string {
+	if u == nil {
+		return nil
+	}
+
+	return effectiveValues(u.Values, u.Mode, existing)
+}
+
+// effectiveValues returns the new values that will be effective after the update.
+func effectiveValues[T comparable](values []T, mode RelationshipUpdateMode, existing []T) []T {
+	switch mode {
+	case RelationshipUpdateModeAdd:
+		return sliceutil.AppendUniques(existing, values)
+	case RelationshipUpdateModeRemove:
+		return sliceutil.Exclude(existing, values)
+	case RelationshipUpdateModeSet:
+		return values
+	}
+
+	return nil
+}