fix(schema): allow 1:m properties in pivot entities

packages/knex/src/schema/DatabaseTable.ts

@@ -83,7 +83,7 @@ export class DatabaseTable {
   }
 
   addColumnFromProperty(prop: EntityProperty, meta: EntityMetadata, config: Configuration) {
-    prop.fieldNames.forEach((field, idx) => {
+    prop.fieldNames?.forEach((field, idx) => {
       const type = prop.enum ? 'enum' : prop.columnTypes[idx];
       const mappedType = this.platform.getMappedType(type);
 

tests/issues/GHx11.test.ts

@@ -0,0 +1,96 @@
+import {
+  Collection,
+  Entity,
+  ManyToMany,
+  ManyToOne,
+  MikroORM,
+  OneToMany,
+  PrimaryKey,
+  PrimaryKeyProp,
+} from '@mikro-orm/sqlite';
+import { v4 } from 'uuid';
+
+@Entity()
+class Bar {
+
+  @PrimaryKey({
+    unique: true,
+  })
+  id: string = v4();
+
+  @ManyToMany({
+    entity: () => Foo,
+    mappedBy: o => o.bars,
+  })
+  foos = new Collection<Foo>(this);
+
+}
+
+@Entity()
+class Foo {
+
+  @PrimaryKey({
+    unique: true,
+  })
+  id: string = v4();
+
+  @ManyToMany({
+    entity: () => Bar,
+    pivotEntity: () => FooBar,
+    type: Bar,
+  })
+  bars = new Collection<Bar>(this);
+
+}
+
+@Entity()
+class FooBar {
+
+  @ManyToOne({
+    entity: () => Foo,
+    primary: true,
+  })
+  foo!: Foo;
+
+  @ManyToOne({
+    entity: () => Bar,
+    primary: true,
+  })
+  user!: Bar;
+
+  @OneToMany(() => Baz, baz => baz.foobar, { nullable: true, default: null })
+  bazes = new Collection<Baz>(this);
+
+  [PrimaryKeyProp]?: ['foo', 'bar'];
+
+}
+
+@Entity()
+class Baz {
+
+  @PrimaryKey({
+    unique: true,
+  })
+  id: string = v4();
+
+  @ManyToOne(() => FooBar)
+  foobar!: FooBar;
+
+}
+
+let orm: MikroORM;
+
+beforeAll(async () => {
+  orm = await MikroORM.init({
+    entities: [FooBar],
+    dbName: ':memory:',
+  });
+});
+
+afterAll(async () => {
+  await orm.close(true);
+});
+
+test('1:m property inside pivot entity', async () => {
+  await expect(orm.schema.getUpdateSchemaSQL()).resolves.toMatchSnapshot();
+});

tests/issues/__snapshots__/GHx11.test.ts.snap

@@ -0,0 +1,19 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`1:m property inside pivot entity 1`] = `
+"pragma foreign_keys = off;
+
+create table \`bar\` (\`id\` text not null, primary key (\`id\`));
+
+create table \`foo\` (\`id\` text not null, primary key (\`id\`));
+
+create table \`foo_bar\` (\`foo_id\` text not null, \`user_id\` text not null, constraint \`foo_bar_foo_id_foreign\` foreign key(\`foo_id\`) references \`foo\`(\`id\`) on update cascade, constraint \`foo_bar_user_id_foreign\` foreign key(\`user_id\`) references \`bar\`(\`id\`) on update cascade, primary key (\`foo_id\`, \`user_id\`));
+create index \`foo_bar_foo_id_index\` on \`foo_bar\` (\`foo_id\`);
+create index \`foo_bar_user_id_index\` on \`foo_bar\` (\`user_id\`);
+
+create table \`baz\` (\`id\` text not null, \`foobar_foo_id\` text not null, \`foobar_user_id\` text not null, constraint \`baz_foobar_foo_id_foobar_user_id_foreign\` foreign key(\`foobar_foo_id\`, \`foobar_user_id\`) references \`foo_bar\`(\`foo_id\`, \`user_id\`) on update cascade, primary key (\`id\`));
+create index \`baz_foobar_foo_id_foobar_user_id_index\` on \`baz\` (\`foobar_foo_id\`, \`foobar_user_id\`);
+
+pragma foreign_keys = on;
+"
+`;