node.js - Mongoose: Simple custom validation function not working -


background

i defining mongoose schema countries, store country name, , iso alpha2 , iso alpha3 codes.

these iso codes, abbreviations country names. example, spain es, united sates us, , on.

objective

my objective schema validation codes have right amount of letters when inserting country in collection.

an iso alpha2 code can have 2 characters, , iso alpha3 code can have 3.

problem

to achieve have validation function checks if given code has correct size:

const hasvalidformat = (val, size) => val.length === size;

and trying use function validator:

"use strict";  const mongoose = require("mongoose");  const hasvalidformat = (val, size) => val.length === size;   const countryschema = {     name: { type: string, required: true },     isocodes:{         alpha2: {              type: string,              required:true,             validate: {                 validator: hasvalidformat(val, 2),                 message: "incorrect format alpha-2 type iso code."             }         },         alpha3: {              type: string,              validate: {                 validator: hasvalidformat(val, 3),                 message: "incorrect format alpha-3 type iso code."             }                    }     } };   module.exports = new mongoose.schema(countryschema); module.exports.countryschema = countryschema;

the problem have error val not defined , code wont run. confusing, because according mongoose docs custom validators, validator field function!

however

if change previous code to:

"use strict";  const mongoose = require("mongoose");  const hasvalidformat = (val, size) => val.length === size;   const countryschema = {     name: { type: string, required: true },     isocodes:{         alpha2: {              type: string,              required:true,             validate: {                 validator: val => hasvalidformat(val, 2),                 message: "incorrect format alpha-2 type iso code."             }         },         alpha3: {              type: string,              validate: {                 validator: val => hasvalidformat(val, 3),                 message: "incorrect format alpha-3 type iso code."             }                    }     } };   module.exports = new mongoose.schema(countryschema); module.exports.countryschema = countryschema;

it work!

question

can explain me why first example doesn't work, , second does?

this because validator function take 1 parameter.

according documentation, if validator function takes 2 parameters, mongoose assume 2nd argument callback.

"custom validators can asynchronous. if validator function takes 2 arguments, mongoose assume 2nd argument callback."

source: http://mongoosejs.com/docs/validation.html

you first code fails because mongoose seeing async validation, not case. golden rule, validation functions should inline.

you can achieve behavior looking bu using closer function, in second code sample.

thanks,


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more