Merge pull request #1100 from morintd/fix_query_null

fix: 🐛 properly query with child: null

src/__tests__/find/find.test.ts

@@ -291,6 +291,19 @@ describe('find', () => {
 
         expect(realBlogs).toEqual(mockBlogs);
       });
+
+      it(`Should match on null`, async () => {
+        const realBlogs = await prisma.blog.findMany({
+          where: { author: null },
+          select: { title: true },
+        });
+        const mockBlogs = await prismock.blog.findMany({
+          where: { author: null },
+          select: { title: true },
+        });
+
+        expect(realBlogs).toEqual(mockBlogs);
+      });
     });
 
     it('should correctly query on Datetime type field', async () => {

src/lib/operations/find/match.ts

@@ -54,11 +54,19 @@ export const matchMultiple = (item: Item, where: FindWhereArgs, current: Delegat
       return false;
     }
 
-    if (filter == null || filter === undefined) {
-      if (filter === null) return val === null || val === undefined;
+    if (filter === undefined) {
       return true;
     }
 
+    if (filter === null) {
+      const field = current.model.fields.find((field) => field.name === child);
+
+      if (field?.relationFromFields && field.relationFromFields.length > 0) {
+        return item[field.relationFromFields[0]] === null || item[field.relationFromFields[0]] === undefined;
+      }
+      return val === null || val === undefined;
+    }
+
     // Support querying fields with bigint in query.
     if (typeof filter === 'bigint') {
       if (filter === BigInt(val)) {