Performer disambiguation and aliases (#3113)

* Refactor performer relationships
* Remove checksum from performer
* Add disambiguation, overhaul aliases
* Add disambiguation filter criterion
* Improve name matching during import
* Add disambiguation filtering in UI
* Include aliases in performer select

pkg/models/relationships.go

@@ -42,6 +42,10 @@ type FileLoader interface {
 	GetFiles(ctx context.Context, relatedID int) ([]file.File, error)
 }
 
+type AliasLoader interface {
+	GetAliases(ctx context.Context, relatedID int) ([]string, error)
+}
+
 // RelatedIDs represents a list of related IDs.
 // TODO - this can be made generic
 type RelatedIDs struct {
@@ -481,3 +485,61 @@ func (r *RelatedFiles) loadPrimary(fn func() (file.File, error)) error {
 
 	return nil
 }
+
+// RelatedStrings represents a list of related strings.
+// TODO - this can be made generic
+type RelatedStrings struct {
+	list []string
+}
+
+// NewRelatedStrings returns a loaded RelatedStrings object with the provided values.
+// Loaded will return true when called on the returned object if the provided slice is not nil.
+func NewRelatedStrings(values []string) RelatedStrings {
+	return RelatedStrings{
+		list: values,
+	}
+}
+
+// Loaded returns true if the related IDs have been loaded.
+func (r RelatedStrings) Loaded() bool {
+	return r.list != nil
+}
+
+func (r RelatedStrings) mustLoaded() {
+	if !r.Loaded() {
+		panic("list has not been loaded")
+	}
+}
+
+// List returns the related values. Panics if the relationship has not been loaded.
+func (r RelatedStrings) List() []string {
+	r.mustLoaded()
+
+	return r.list
+}
+
+// Add adds the provided values to the list. Panics if the relationship has not been loaded.
+func (r *RelatedStrings) Add(values ...string) {
+	r.mustLoaded()
+
+	r.list = append(r.list, values...)
+}
+
+func (r *RelatedStrings) load(fn func() ([]string, error)) error {
+	if r.Loaded() {
+		return nil
+	}
+
+	values, err := fn()
+	if err != nil {
+		return err
+	}
+
+	if values == nil {
+		values = []string{}
+	}
+
+	r.list = values
+
+	return nil
+}