Refactor tenant ORM integration (#1650)

* Refactor tenant ORM integration

* fix tests

server/src/tenant/metadata/entity-schema-generator/entity-schema-generator.service.ts

@@ -0,0 +1,43 @@
+import { Injectable } from '@nestjs/common';
+
+import { EntitySchema } from 'typeorm';
+
+import { ObjectMetadataService } from 'src/tenant/metadata/object-metadata/object-metadata.service';
+
+import { baseColumns } from './base.entity';
+import {
+  convertFieldTypeToPostgresType,
+  sanitizeColumnName,
+} from './entity-schema-generator.util';
+
+@Injectable()
+export class EntitySchemaGeneratorService {
+  constructor(private readonly objectMetadataService: ObjectMetadataService) {}
+
+  async getTypeORMEntitiesByDataSourceId(dataSourceId: string) {
+    const objectMetadata =
+      await this.objectMetadataService.getObjectMetadataFromDataSourceId(
+        dataSourceId,
+      );
+
+    const entities = objectMetadata.map((object) => {
+      return new EntitySchema({
+        name: object.name,
+        columns: {
+          ...baseColumns,
+          ...object.fields.reduce((columns, field) => {
+            return {
+              ...columns,
+              [sanitizeColumnName(field.name)]: {
+                type: convertFieldTypeToPostgresType(field.type),
+                nullable: true,
+              },
+            };
+          }, {}),
+        },
+      });
+    });
+
+    return entities;
+  }
+}