Add Relation Metadata (#2388)

* Add Relation Metadata

* remove logs

* fix migrations

* add one-to-many relation inside entities

* fix relation

* use enum for tenant migration column action type

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

@@ -0,0 +1,93 @@
+import { ObjectType, ID, Field } from '@nestjs/graphql';
+
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  JoinColumn,
+  ManyToOne,
+  OneToOne,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+import {
+  Authorize,
+  IDField,
+  QueryOptions,
+  Relation,
+} from '@ptc-org/nestjs-query-graphql';
+
+import { FieldMetadata } from 'src/metadata/field-metadata/field-metadata.entity';
+import { ObjectMetadata } from 'src/metadata/object-metadata/object-metadata.entity';
+
+export enum RelationType {
+  ONE_TO_ONE = 'ONE_TO_ONE',
+  ONE_TO_MANY = 'ONE_TO_MANY',
+  MANY_TO_MANY = 'MANY_TO_MANY',
+}
+
+@Entity('relationMetadata')
+@ObjectType('relation')
+@Authorize({
+  authorize: (context: any) => ({
+    workspaceId: { eq: context?.req?.user?.workspace?.id },
+  }),
+})
+@QueryOptions({
+  defaultResultSize: 10,
+  disableFilter: true,
+  disableSort: true,
+  maxResultsSize: 1000,
+})
+@Relation('fromObjectMetadata', () => ObjectMetadata)
+@Relation('toObjectMetadata', () => ObjectMetadata)
+export class RelationMetadata {
+  @IDField(() => ID)
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Field()
+  @Column({ nullable: false })
+  relationType: RelationType;
+
+  @Field()
+  @Column({ nullable: false, type: 'uuid' })
+  fromObjectMetadataId: string;
+
+  @Field()
+  @Column({ nullable: false, type: 'uuid' })
+  toObjectMetadataId: string;
+
+  @Field()
+  @Column({ nullable: false, type: 'uuid' })
+  fromFieldMetadataId: string;
+
+  @Field()
+  @Column({ nullable: false, type: 'uuid' })
+  toFieldMetadataId: string;
+
+  @Column({ nullable: false })
+  workspaceId: string;
+
+  @ManyToOne(() => ObjectMetadata, (object) => object.fromRelations)
+  fromObjectMetadata: ObjectMetadata;
+
+  @ManyToOne(() => ObjectMetadata, (object) => object.toRelations)
+  toObjectMetadata: ObjectMetadata;
+
+  @OneToOne(() => FieldMetadata, (field) => field.fromRelationMetadata)
+  @JoinColumn()
+  fromFieldMetadata: FieldMetadata;
+
+  @OneToOne(() => FieldMetadata, (field) => field.toRelationMetadata)
+  @JoinColumn()
+  toFieldMetadata: FieldMetadata;
+
+  @Field()
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @Field()
+  @UpdateDateColumn()
+  updatedAt: Date;
+}