SQLite model refactoring (#3791)

* Remove ID from PerformerPartial
* Separate studio model from sqlite model
* Separate movie model from sqlite model
* Separate tag model from sqlite model
* Separate saved filter model from sqlite model
* Separate scene marker model from sqlite model
* Separate gallery chapter model from sqlite model
* Move ErrNoRows checks into sqlite, improve empty result error messages
* Move SQLiteDate and SQLiteTimestamp to sqlite
* Use changesetTranslator everywhere, refactor for consistency
* Make PerformerStore.DestroyImage private
* Fix rating on movie create

pkg/sqlite/date.go

@@ -0,0 +1,80 @@
+package sqlite
+
+import (
+	"database/sql/driver"
+	"time"
+
+	"github.com/stashapp/stash/pkg/models"
+)
+
+const sqliteDateLayout = "2006-01-02"
+
+// Date represents a date stored as "YYYY-MM-DD"
+type Date struct {
+	Date time.Time
+}
+
+// Scan implements the Scanner interface.
+func (d *Date) Scan(value interface{}) error {
+	d.Date = value.(time.Time)
+	return nil
+}
+
+// Value implements the driver Valuer interface.
+func (d Date) Value() (driver.Value, error) {
+	return d.Date.Format(sqliteDateLayout), nil
+}
+
+// NullDate represents a nullable date stored as "YYYY-MM-DD"
+type NullDate struct {
+	Date  time.Time
+	Valid bool
+}
+
+// Scan implements the Scanner interface.
+func (d *NullDate) Scan(value interface{}) error {
+	var ok bool
+	d.Date, ok = value.(time.Time)
+	if !ok {
+		d.Date = time.Time{}
+		d.Valid = false
+		return nil
+	}
+
+	// Zero dates, which primarily come from empty strings in the DB, are treated as being invalid.
+	// TODO: add migration to remove invalid dates from the database and remove this.
+	// Ensure elsewhere that empty date inputs resolve to a null date and not a zero date.
+	// Zero dates shouldn't be invalid.
+	if d.Date.IsZero() {
+		d.Valid = false
+	} else {
+		d.Valid = true
+	}
+
+	return nil
+}
+
+// Value implements the driver Valuer interface.
+func (d NullDate) Value() (driver.Value, error) {
+	// TODO: don't ignore zero value, as above
+	if !d.Valid || d.Date.IsZero() {
+		return nil, nil
+	}
+
+	return d.Date.Format(sqliteDateLayout), nil
+}
+
+func (d *NullDate) DatePtr() *models.Date {
+	if d == nil || !d.Valid {
+		return nil
+	}
+
+	return &models.Date{Time: d.Date}
+}
+
+func NullDateFromDatePtr(d *models.Date) NullDate {
+	if d == nil {
+		return NullDate{Valid: false}
+	}
+	return NullDate{Date: d.Time, Valid: true}
+}