Refactor backend folder structure (#4505)

* Refactor backend folder structure

Co-authored-by: Charles Bochet <charles@twenty.com>

* fix tests

* fix

* move yoga hooks

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/utils/deduce-relation-direction.util.ts

@@ -0,0 +1,30 @@
+import { FieldMetadataInterface } from 'src/engine-metadata/field-metadata/interfaces/field-metadata.interface';
+import { RelationMetadataInterface } from 'src/engine-metadata/field-metadata/interfaces/relation-metadata.interface';
+
+export enum RelationDirection {
+  FROM = 'from',
+  TO = 'to',
+}
+
+export const deduceRelationDirection = (
+  fieldMetadata: FieldMetadataInterface,
+  relationMetadata: RelationMetadataInterface,
+): RelationDirection => {
+  if (
+    relationMetadata.fromObjectMetadataId === fieldMetadata.objectMetadataId &&
+    relationMetadata.fromFieldMetadataId === fieldMetadata.id
+  ) {
+    return RelationDirection.FROM;
+  }
+
+  if (
+    relationMetadata.toObjectMetadataId === fieldMetadata.objectMetadataId &&
+    relationMetadata.toFieldMetadataId === fieldMetadata.id
+  ) {
+    return RelationDirection.TO;
+  }
+
+  throw new Error(
+    `Relation metadata ${relationMetadata.id} is not related to object ${fieldMetadata.objectMetadataId}`,
+  );
+};