add server to monorepo.

packages/server/src/collection/SoftDeleteQueryBuilder.ts

@@ -0,0 +1,73 @@
+import moment from 'moment';
+import { Model } from 'objection';
+
+const options = {
+  columnName: 'deleted_at',
+  deletedValue: moment().format('YYYY-MM-DD HH:mm:ss'),
+  notDeletedValue: null,
+};
+
+export default class SoftDeleteQueryBuilder extends Model.QueryBuilder {
+  constructor(...args) {
+    super(...args);
+
+    this.onBuild((builder) => {
+      if (builder.isFind() || builder.isDelete() || builder.isUpdate()) {
+        builder.whereNotDeleted();
+      }
+    });
+  }
+
+  /**
+   * override the normal delete function with one that patches the row's "deleted" column
+   */
+  delete() {
+    this.context({
+      softDelete: true,
+    });
+    const patch = {};
+    patch[options.columnName] = options.deletedValue;
+    return this.patch(patch);
+  }
+
+  /**
+   * Provide a way to actually delete the row if necessary
+   */
+  hardDelete() {
+    return super.delete();
+  }
+
+  /**
+   * Provide a way to undo the delete
+   */
+  undelete() {
+    this.context({
+      undelete: true,
+    });
+    const patch = {};
+    patch[options.columnName] = options.notDeletedValue;
+    return this.patch(patch);
+  }
+
+  /**
+   * Provide a way to filter to ONLY deleted records without having to remember the column name
+   */
+  whereDeleted() {
+    const prefix = this.modelClass().tableName;
+
+    // this if is for backwards compatibility, to protect those that used a nullable `deleted` field
+    if (options.deletedValue === true) {
+      return this.where(`${prefix}.${options.columnName}`, options.deletedValue);
+    }
+    // qualify the column name
+    return this.whereNot(`${prefix}.${options.columnName}`, options.notDeletedValue);
+  }
+
+  // provide a way to filter out deleted records without having to remember the column name
+  whereNotDeleted() {
+    const prefix = this.modelClass().tableName;
+
+    // qualify the column name
+    return this.where(`${prefix}.${options.columnName}`, options.notDeletedValue);
+  }
+}