fix(default): table default for string values

* add test for empty string and string default

Author: marcjulian

__tests__/fixtures/table.datamodel.ts

@@ -5,3 +5,11 @@ export const datamodelSingleTable = /* Prisma */ `
     age Int?
   }
 `;
+
+export const datamodelTableWithStringDefaults = /* Prisma */ `
+  model Post {
+    id Int @id @default(autoincrement())
+    title String @default("")
+    color String @default("blue")
+  }
+`;

__tests__/table.test.ts

@@ -1,4 +1,7 @@
-import { datamodelSingleTable } from './fixtures/table.datamodel';
+import {
+  datamodelSingleTable,
+  datamodelTableWithStringDefaults,
+} from './fixtures/table.datamodel';
 import { generateDMMF } from './utils/generateDMMF';
 import { generateTables } from '../src/generator/table';
 
@@ -16,4 +19,18 @@ describe('Tables', () => {
     expect(enums.length).toEqual(1);
     expect(enums[0]).toMatch(expected);
   });
+
+  test('generate a table with empty string default', async () => {
+    const dmmf = await generateDMMF(datamodelTableWithStringDefaults);
+
+    const expected = `Table Post {
+  id Int [pk, increment]
+  title String [not null, default: '']
+  color String [not null, default: 'blue']
+}`;
+    const enums = generateTables(dmmf.datamodel.models);
+
+    expect(enums.length).toEqual(1);
+    expect(enums[0]).toMatch(expected);
+  });
 });

prisma/dbml/schema.dbml

@@ -24,7 +24,7 @@ Table Profile {
 
 Table Post {
   id Int [pk, increment]
-  title String [not null]
+  title String [not null, default: '']
   content String
   published Boolean [not null, default: false]
   author User

prisma/schema.prisma

@@ -36,7 +36,7 @@ model Profile {
 
 model Post {
   id        Int     @id @default(autoincrement())
-  title     String
+  title     String  @default("")
   content   String?
   published Boolean @default(false)
   author    User?   @relation(fields: [authorId], references: [id])

src/generator/table.ts

@@ -46,12 +46,8 @@ const generateColumnDefinition = (field: DMMF.Field): string => {
     columnDefinition.push('not null');
   }
 
-  if (
-    typeof field.default === 'string' ||
-    typeof field.default === 'boolean' ||
-    typeof field.default === 'number'
-  ) {
-    if (field.kind === 'enum') {
+  if (field.hasDefaultValue && typeof field.default != 'object') {
+    if (field.type === 'String' || field.kind === 'enum') {
       columnDefinition.push(`default: '${field.default}'`);
     } else {
       columnDefinition.push(`default: ${field.default}`);