examiner

Validate your data however you want

Installation

npm install --save examiner

Variable filters

import {Validator} from 'examiner';
 
var user = {
  hasMessages: true,
  messages: [
    {body: 'message 1'},
    {body: 'message 2'},
    {body: 'message 3'}
  ]
};
 
var validator = new Validator({
  rules: {
    'messages.$.body': function(data) {
      return data.hasMessages ? 'required|min:10|string' : null;
    }
  }
});
validator.validate(user);

You can use Validator.rules which works pretty like classNames module, and you can use like this for toggle specific filters in a rule while using the variable filters feature:

import {Validator, rules} from 'examiner';
 
// or just Validator.rules
 
var validator = new Validator({
  rules: {
    name: function(data, validator) {
      return rules('string', {
        required: !validator.empty
      });
    }
  }
});

Using presets

Presets could be useful if you want to reuse validation rules or replaces into more than one Validator instance without need to rewrite anything.

import {Validator} from 'examiner';
 
Validator.setPreset('user_email_validation', {
  rules: {
    email: 'email|required|string'
  }
});
 
var validator = new Validator({
  rules: {
    'name': 'required|string|min:10'
  },
  presets: ['user_email_validation']
});
 
validator.validate({
  name: 'marshall mathers',
  email: '[e-mail]'
});

Extending presets

import _ from 'lodash';
import {Validator} from 'examiner';
 
Validator.setPreset('my_custom_preset', {
  rules: {
    'name': function(data) {
      return data.shouldRequireName ? 'required|string' : null;
    }
  }
});
Validator.setPreset('another_cool_preset', {
  rules: {
    cool_rule: 'required|string'
  }
});
 
var user = {
  deep: {
    name: 'john crockful'
  }
};
 
var validator = new Validator({
  presets: {
    my_custom_preset: function(preset) {
      return {
        rules: _.mapKeys(preset.rules, function(value, key) {
          return `deep.${key}`;
        });
      };
    },
    another_cool_preset: function(data) {
      return false;
    }
  }
});

The preset another_cool_preset will be ignored for now since it returned as false, and my_custom_preset will be extended to the following. But only internally at the time of the validation, the global preset will stay the same for other Validator instances:

{
  rules: {
    'deep.name': function(data) {
      return data.shouldRequiredName ? 'required|string' : null;
    }
  }
}

There are still some helper functions at the constructor of Validator, like Validator.transformPreset which can be used to add a prefix in front of the preset keys and replaces:

Validator.setPreset({
  userDocuments: {
    rules: {
      validUntil: 'date|required',
      description: 'string|required',
      photo: 'url|required'
    }
  }
});
 
var validator = new Validator({
  presets: {
    userDocuments: function(preset) {
      return Validator.transformPreset(preset, {prefix: 'documents.$.'});
    }
  }
});

Validating arrays

What really happens here is when you have a expression that contain a $ between two dots like user.messages.$.name it searchs into the given data and generate temporary rules and replaces according to the array of your data.

import {Validator} from 'examiner';
 
var user = {
  documents: [{
    name: 'My id 1'
  }, {
    name: 'My id 2'
  }]
};
var validator = new Validator({
  rules: {
    'documents.$.name': 'required|min:10'
  },
  replaces: {
    // the messages will be like:
    //  - The field "document name 4" is required
    //  - The field "document name 4" need to have at least 10 characters
    'documents.$.name': function(i) {
      return `document name ${i + 1}`;
    }
  }
});
validator.validate(user);

Internally the validator has been created the following rules and replaces to validate your data:

{
  rules: {
    'documents.0.name': 'required|min:10',
    'documents.1.name': 'required|min:10'
  },
  replaces: {
    'documents.0.name': 'document name 1',
    'documents.1.name': 'document name 2'
  }
}

While using $ on expressions, all the rules are generated based on the data passed to validator.validate function. So when searching for deep keys, you cannot provide undefined properties. The following example WILL NOT WORK:

var validator = new Validator({
  rules: {
    'phonenumbers.$': 'required|string|size:9'
  }
});
validator.validate();

The correct way to call validator.validate is:

validator.validate({
  phonenumbers: new Array(10)
});

Let's not forgot that when you're creating a dot expression with a $, your replace for that expression can and should carry a function which will be executed and the first argument will always be the index of the current array item. And before you can ask, there is no limit for how many $ you can put in a simple dot expression.

Translating messages

First you should make a copy of lang/en/messages.js, change, and import the new one in your Validator instance:

import {Validator} from 'examiner';
 
var validator = new Validator();
validator.update({
  rules: {
    'name': 'required|string'
  }
});
validator.loadFromJSON(require('./lang/en-us/messages'));
 
// Globally
Validator.loadFromJSON(require('./lang/pt-br/messages'));

Using with ReactJS

import _ from 'lodash';
import React from 'react';
import {Validator} from 'examiner';
 
var AppIndex = React.createClass({
  getInitialState: function() {
    return {
      user: {
        name: ''
      },
      validator: new Validator({
        rules: {
          name: 'required|min:10'
        }
      })
    };
  },
  handleChange: function() {
    var user = _.clone(this.state.user);
    _.extend(user, {
      name: this.refs.userName.value
    });
    this.state.validator.validate(user);
    this.setState({user: user});
  },
  render: function() {
    return (
      <form>
        {_.map(this.state.validator.messages, function(errors, fieldName) {
          return _.map(errors, function(message, rule) {
            return (
              <div className="alert alert-danger" key={`${fieldName}_${rule}`}>
                {message}
              </div>
            );
          });
        })}
        <input ref="userName" value={this.state.user.name} onChange={this.handleChange} />
        <button disabled={this.state.validator.invalid} type="submit">
          Send
        </button>
      </form>
    );
  }
});

Private filters

var Validator = require('examiner').Validator;
var validator = new Validator({
  rules: {
 
  }
});
validator.setFilter('special_filter', function(string) {
  return /[A-Z]+/.test(string);
});

Global filters

var Validator = require('examiner').Validator;
Validator.setFilter('special_filter', function(string) {
  return /[A-Z]+/.test(string);
});

Need more? Come and check more examples!