add server to monorepo.

packages/server/src/models/Pagination.ts

@@ -0,0 +1,48 @@
+import { Model } from 'objection';
+import { isEmpty } from 'lodash';
+import { ServiceError } from '@/exceptions';
+
+export default class PaginationQueryBuilder extends Model.QueryBuilder {
+  pagination(page, pageSize) {
+    return super.page(page, pageSize).runAfter(({ results, total }) => {
+      return {
+        results,
+        pagination: {
+          total,
+          page: page + 1,
+          pageSize,
+        },
+      };
+    });
+  }
+
+  queryAndThrowIfHasRelations = ({ type, message }) => {
+    const model = this.modelClass();
+    const modelRelations = Object.keys(model.relationMappings).filter(
+      (relation) =>
+        [Model.HasManyRelation, Model.HasOneRelation].indexOf(
+          model.relationMappings[relation]?.relation
+        ) !== -1
+    );
+    const relations = model.secureDeleteRelations || modelRelations;
+
+    this.runAfter((model, query) => {
+      const nonEmptyRelations = relations.filter(
+        (relation) => !isEmpty(model[relation])
+      );
+      if (nonEmptyRelations.length > 0) {
+        throw new ServiceError(type || 'MODEL_HAS_RELATIONS', { message });
+      }
+      return model;
+    });
+    return this.onBuild((query) => {
+      relations.forEach((relation) => {
+        query.withGraphFetched(`${relation}(selectId)`).modifiers({
+          selectId(builder) {
+            builder.select('id');
+          },
+        });
+      });
+    });
+  };
+}