Add a dedicated GQL server for metadata available on /meta (#1820)

server/src/metadata/object-metadata/object-metadata.entity.ts

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+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  OneToMany,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+import { FieldMetadata } from 'src/metadata/field-metadata/field-metadata.entity';
+
+@Entity('object_metadata')
+export class ObjectMetadata {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ nullable: false, name: 'data_source_id' })
+  dataSourceId: string;
+
+  @Column({ nullable: false, name: 'display_name' })
+  displayName: string;
+
+  @Column({ nullable: false, name: 'target_table_name' })
+  targetTableName: string;
+
+  @Column({ default: false, name: 'is_custom' })
+  isCustom: boolean;
+
+  @Column({ nullable: false, name: 'workspace_id' })
+  workspaceId: string;
+
+  @OneToMany(() => FieldMetadata, (field) => field.object)
+  fields: FieldMetadata[];
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}

server/src/metadata/object-metadata/object-metadata.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { ObjectMetadataService } from './object-metadata.service';
+import { ObjectMetadata } from './object-metadata.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([ObjectMetadata], 'metadata')],
+  providers: [ObjectMetadataService],
+  exports: [ObjectMetadataService],
+})
+export class ObjectMetadataModule {}

server/src/metadata/object-metadata/object-metadata.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+
+import { ObjectMetadataService } from './object-metadata.service';
+import { ObjectMetadata } from './object-metadata.entity';
+
+describe('ObjectMetadataService', () => {
+  let service: ObjectMetadataService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        ObjectMetadataService,
+        {
+          provide: getRepositoryToken(ObjectMetadata, 'metadata'),
+          useValue: {},
+        },
+      ],
+    }).compile();
+
+    service = module.get<ObjectMetadataService>(ObjectMetadataService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

server/src/metadata/object-metadata/object-metadata.service.ts

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+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+
+import { Repository } from 'typeorm';
+
+import { ObjectMetadata } from './object-metadata.entity';
+
+@Injectable()
+export class ObjectMetadataService {
+  constructor(
+    @InjectRepository(ObjectMetadata, 'metadata')
+    private readonly fieldMetadataRepository: Repository<ObjectMetadata>,
+  ) {}
+
+  public async getObjectMetadataFromDataSourceId(dataSourceId: string) {
+    return this.fieldMetadataRepository.find({
+      where: { dataSourceId },
+      relations: ['fields'],
+    });
+  }
+
+  public async getObjectMetadataFromId(objectMetadataId: string) {
+    return this.fieldMetadataRepository.findOne({
+      where: { id: objectMetadataId },
+      relations: ['fields'],
+    });
+  }
+}