feat: add useCreateOneRelationMetadata and useRelationMetadata (#2559)

Closes #2423

front/src/modules/object-metadata/utils/formatRelationMetadataInput.ts

@@ -0,0 +1,59 @@
+import { RelationType } from '@/settings/data-model/types/RelationType';
+import {
+  CreateRelationInput,
+  Field,
+  RelationMetadataType,
+} from '~/generated-metadata/graphql';
+
+import { formatFieldMetadataItemInput } from './formatFieldMetadataItemInput';
+
+export type FormatRelationMetadataInputParams = {
+  relationType: RelationType;
+  field: Pick<Field, 'label' | 'icon' | 'description'>;
+  objectMetadataId: string;
+  connect: {
+    field: Pick<Field, 'label' | 'icon'>;
+    objectMetadataId: string;
+  };
+};
+
+export const formatRelationMetadataInput = (
+  input: FormatRelationMetadataInputParams,
+): CreateRelationInput => {
+  // /!\ MANY_TO_ONE does not exist on backend.
+  // => Transform into ONE_TO_MANY and invert "from" and "to" data.
+  const isManyToOne = input.relationType === 'MANY_TO_ONE';
+  const relationType = isManyToOne
+    ? RelationMetadataType.OneToMany
+    : (input.relationType as RelationMetadataType);
+  const { field: fromField, objectMetadataId: fromObjectMetadataId } =
+    isManyToOne ? input.connect : input;
+  const { field: toField, objectMetadataId: toObjectMetadataId } = isManyToOne
+    ? input
+    : input.connect;
+
+  const {
+    description,
+    icon: fromIcon,
+    label: fromLabel,
+    name: fromName,
+  } = formatFieldMetadataItemInput(fromField);
+  const {
+    icon: toIcon,
+    label: toLabel,
+    name: toName,
+  } = formatFieldMetadataItemInput(toField);
+
+  return {
+    description,
+    fromIcon,
+    fromLabel,
+    fromName,
+    fromObjectMetadataId,
+    relationType,
+    toIcon,
+    toLabel,
+    toName,
+    toObjectMetadataId,
+  };
+};