feat(QueryBuilder): Support .now() default for timestamps

src/Mapping.ts

@@ -95,6 +95,15 @@ export class Mapping<T> {
     return this.target;
   }
 
+  /**
+   * Raw command for current timestamp.
+   *
+   * @returns {Raw}
+   */
+  public now(): Raw {
+    return new Raw('CURRENT_TIMESTAMP');
+  }
+
   /**
    * Map a field to this property. Examples:
    *
@@ -805,6 +814,37 @@ export class Field {
   }
 }
 
+/**
+ * A raw query
+ */
+export class Raw {
+  /**
+   * @type {string}
+   */
+  private query: string;
+
+  /**
+   * @param {string} query
+   */
+  public constructor(query) {
+    this.setQuery(query);
+  }
+
+  /**
+   * @returns {string}
+   */
+  getQuery(): string {
+    return this.query;
+  }
+
+  /**
+   * @param {string} value
+   */
+  setQuery(value: string) {
+    this.query = value;
+  }
+}
+
 export interface FieldOptions {
   type: string,
   primary?: boolean,
@@ -814,7 +854,7 @@ export interface FieldOptions {
   generatedValue?: string,
   scale?: number,
   nullable?: boolean,
-  defaultsTo?: any,
+  defaultTo?: any | Raw,
   unsigned?: boolean,
   comment?: string,
   size?: number,

src/SchemaBuilder.ts

@@ -1,4 +1,4 @@
-import {Mapping, FieldOptions} from './Mapping';
+import {Mapping, FieldOptions, Raw} from './Mapping';
 import {EntityInterface, EntityCtor} from './EntityInterface';
 import * as Knex from 'knex';
 import {Scope} from './Scope';
@@ -26,6 +26,11 @@ export class SchemaBuilder {
    */
   private built: boolean = false;
 
+  /**
+   * @type {Knex}
+   */
+  private client: Knex;
+
   /**
    * @type {string[]}
    */
@@ -53,6 +58,7 @@ export class SchemaBuilder {
    */
   public constructor(entityManager: Scope) {
     this.entityManager = entityManager;
+    this.client        = entityManager.getStore().getConnection(Store.ROLE_MASTER);
   }
 
   /**
@@ -397,6 +403,14 @@ export class SchemaBuilder {
     if (field.primary) {
       column.primary();
     }
+
+    if (field.defaultTo) {
+      if (field.defaultTo instanceof Raw) {
+        column.defaultTo(this.client.raw(field.defaultTo.getQuery()));
+      } else {
+        column.defaultTo(field.defaultTo);
+      }
+    }
   }
 
   /**