fix: add create cursor util (#9086)

Followup of #9053

packages/twenty-front/src/modules/apollo/utils/__tests__/encodeCursor.test.ts

@@ -0,0 +1,55 @@
+import { encodeCursor } from '@/apollo/utils/encodeCursor';
+import { ObjectRecord } from '@/object-record/types/ObjectRecord';
+
+describe('encodeCursor', () => {
+  it('should create a cursor with id only', () => {
+    const record: ObjectRecord = { __typename: 'ObjectRecord', id: '123' };
+    const cursor = encodeCursor(record);
+    const decoded = JSON.parse(Buffer.from(cursor, 'base64').toString('utf-8'));
+
+    expect(decoded).toEqual({ id: '123' });
+  });
+
+  it('should create a cursor with id and position', () => {
+    const record: ObjectRecord = {
+      __typename: 'ObjectRecord',
+      id: '123',
+      position: 1,
+    };
+    const cursor = encodeCursor(record);
+    const decoded = JSON.parse(Buffer.from(cursor, 'base64').toString('utf-8'));
+
+    expect(decoded).toEqual({ id: '123', position: 1 });
+  });
+
+  it('should create a cursor with id and position as 0', () => {
+    const record: ObjectRecord = {
+      __typename: 'ObjectRecord',
+      id: '123',
+      position: 0,
+    };
+    const cursor = encodeCursor(record);
+    const decoded = JSON.parse(Buffer.from(cursor, 'base64').toString('utf-8'));
+
+    expect(decoded).toEqual({ id: '123', position: 0 });
+  });
+
+  it('should create a cursor with id and ignore extra fields', () => {
+    const record: ObjectRecord = {
+      __typename: 'ObjectRecord',
+      id: '123',
+      position: 1,
+      extra: 'extra',
+    };
+    const cursor = encodeCursor(record);
+    const decoded = JSON.parse(Buffer.from(cursor, 'base64').toString('utf-8'));
+
+    expect(decoded).toEqual({ id: '123', position: 1 });
+  });
+
+  it('should throw an error if record does not have an id', () => {
+    const record = { position: 1 } as any;
+
+    expect(() => encodeCursor(record)).toThrow();
+  });
+});

packages/twenty-front/src/modules/apollo/utils/encodeCursor.ts

@@ -0,0 +1,18 @@
+import { ObjectRecord } from '@/object-record/types/ObjectRecord';
+import { isDefined } from '~/utils/isDefined';
+
+export const encodeCursor = (record: ObjectRecord) => {
+  if (!('id' in record) || !isDefined(record.id)) {
+    throw new Error('Record does not have an id');
+  }
+
+  const payload: {
+    id: string;
+    position?: number;
+  } = {
+    position: record.position,
+    id: record.id,
+  };
+
+  return Buffer.from(JSON.stringify(payload), 'utf-8').toString('base64');
+};