fix: migration from single to multi value select works automatically

src/app/core/entity/schema-datatypes/datatype-array.spec.ts

@@ -0,0 +1,70 @@
+import { EntitySchemaField } from "../schema/entity-schema-field";
+import { EntitySchemaService } from "../schema/entity-schema.service";
+import { ConfigurableEnumDatatype } from "../../configurable-enum/configurable-enum-datatype/configurable-enum-datatype";
+import { defaultInteractionTypes } from "../../config/default-config/default-interaction-types";
+import { arrayEntitySchemaDatatype } from "./datatype-array";
+
+describe("Schema data type: array", () => {
+  let schemaService: EntitySchemaService;
+  const schema: EntitySchemaField = {
+    dataType: "array",
+    innerDataType: "configurable-enum",
+    additional: "test",
+  };
+  beforeEach(() => {
+    schemaService = new EntitySchemaService();
+    schemaService.registerSchemaDatatype(
+      new ConfigurableEnumDatatype({
+        getEnumValues: () => defaultInteractionTypes,
+      } as any)
+    );
+  });
+
+  it("should transform enums inside arrays", () => {
+    const value = defaultInteractionTypes.map(({ id }) => id);
+
+    const obj = arrayEntitySchemaDatatype.transformToObjectFormat(
+      value,
+      schema,
+      schemaService
+    );
+
+    expect(obj).toEqual(defaultInteractionTypes);
+
+    const db = arrayEntitySchemaDatatype.transformToDatabaseFormat(
+      obj,
+      schema,
+      schemaService
+    );
+
+    expect(db).toEqual(value);
+  });
+
+  it("should automatically wrap value into array (and transform to inner type) if not an array yet", () => {
+    const value = defaultInteractionTypes[1].id;
+
+    const obj = arrayEntitySchemaDatatype.transformToObjectFormat(
+      value,
+      schema,
+      schemaService
+    );
+
+    expect(obj).toEqual([defaultInteractionTypes[1]]);
+  });
+
+  it("should transform empty values as an empty array", () => {
+    let obj = arrayEntitySchemaDatatype.transformToObjectFormat(
+      undefined,
+      schema,
+      schemaService
+    );
+    expect(obj).toEqual([]);
+
+    obj = arrayEntitySchemaDatatype.transformToObjectFormat(
+      "",
+      schema,
+      schemaService
+    );
+    expect(obj).toEqual([]);
+  });
+});

src/app/core/entity/schema-datatypes/datatype-array.ts

@@ -49,9 +49,8 @@ export const arrayEntitySchemaDatatype: EntitySchemaDatatype = {
       return value;
     }
 
-    const arrayElementDatatype: EntitySchemaDatatype = schemaService.getDatatypeOrDefault(
-      schemaField.innerDataType
-    );
+    const arrayElementDatatype: EntitySchemaDatatype =
+      schemaService.getDatatypeOrDefault(schemaField.innerDataType);
     return value.map((el) =>
       arrayElementDatatype.transformToDatabaseFormat(
         el,
@@ -74,12 +73,11 @@ export const arrayEntitySchemaDatatype: EntitySchemaDatatype = {
         value,
         parent
       );
-      return value;
+      value = value ? [value] : [];
     }
 
-    const arrayElementDatatype: EntitySchemaDatatype = schemaService.getDatatypeOrDefault(
-      schemaField.innerDataType
-    );
+    const arrayElementDatatype: EntitySchemaDatatype =
+      schemaService.getDatatypeOrDefault(schemaField.innerDataType);
 
     return value.map((el) =>
       arrayElementDatatype.transformToObjectFormat(