Include ajv-formats by default (#2453)

Closes #2218, #2142, #2146, #2147, #2170

lib/model/AjvValidator.js

@@ -1,17 +1,11 @@
 'use strict';
 
+const Ajv = require('ajv');
+const addFormats = require('ajv-formats');
 const { Validator } = require('./Validator');
 const { ValidationErrorType } = require('../model/ValidationError');
 const { isObject, once, cloneDeep: lodashCloneDeep, omit } = require('../utils/objectUtils');
 
-const getAjv = once(() => {
-  try {
-    return require('ajv');
-  } catch (err) {
-    throw new Error('Optional ajv dependency not installed. Please run `npm install ajv --save`');
-  }
-});
-
 class AjvValidator extends Validator {
   static init(self, conf) {
     super.init(self, conf);
@@ -20,8 +14,6 @@ class AjvValidator extends Validator {
       allErrors: true,
     });
 
-    const Ajv = getAjv();
-
     // Create a normal Ajv instance.
     self.ajv = new Ajv(
       Object.assign(
@@ -43,8 +35,13 @@ class AjvValidator extends Validator {
     // A cache for the compiled validator functions.
     self.cache = new Map();
 
-    conf.onCreateAjv(self.ajv);
-    conf.onCreateAjv(self.ajvNoDefaults);
+    const setupAjv = (ajv) => {
+      addFormats(ajv);
+      conf.onCreateAjv(ajv);
+    };
+
+    setupAjv(self.ajv);
+    setupAjv(self.ajvNoDefaults);
   }
 
   beforeValidate({ json, model, options, ctx }) {

package.json

@@ -54,6 +54,7 @@
   "types": "./typings/objection/index.d.ts",
   "dependencies": {
     "ajv": "^8.6.2",
+    "ajv-formats": "^2.1.1",
     "db-errors": "^0.2.3"
   },
   "peerDependencies": {