Arya

The safest data layer for javascript. Complete with immutable properties, validation/error scheme Written with ES6 specificiations

Install

npm install --save arya

Prototype Methods

Usage

Extend the Arya constructor to create your new class

class Person extends Arya {
 constructor(name, age) {
   super();
   this.register('name', name);
   this.register('age', age);
 }
}

Person.prototype.valid_name = {
 func: function(name) {
   return name && name.length > 3;
 },
 error: 'Name must be atleast 4 characters'
};

Person.prototype.valid_age = {
 func: function(age) {
   return !isNaN(age) && age >= 0 && age <= 1000;
 },
 error: 'Age must be a number between 0 and 1000'
};

var odin = new Person('odin', 1000);
odin.isValid() // true
odin.name() // 'odin'
odin.age() // 1000
odin.name('BAD') // 'BAD'
odin.name.valid() // false
odin.isValid() // false
odin.errors() // { name: 'Name must be atleast 4 characters' };

Arya.prototype.noop(attribute)

object: a nooped object to that is used internally as a default setting for attributes

example

Arya.prototype.noop('age');
//returns
{
  func: function() { return true; },
  error: 'Invalid age'
}

Arya.prototype.errors()

object: an object of errors if any of the attributes on the current object have errors

example

var odin = new Person('odin', 1001);
odin.errors()
// returns
{
  age: 'Age must be a number between 0 and 1000'
}

Arya.prototype.isValid()

boolean: Checks if any properties have any errors

example

var odin = new Person('odin', 1001);
odin.isValid()
// returns
false

Arya.prototype.toJSON()

object: Converts the respective attributes into a simple javascript object

example

var odin = new Person('odin', 1001);
odin.toJSON()
// returns
{
  name: 'odin',
  age: 1001
}

Arya.prototype.register(attribute, value)

Where most of the magic happens. Call this inside your constructor to overload attribute as a method with more methods!

example

var p = new Person('odin', 1001);
p.name
// return
{ name:
  { [Function]
    valid: [Function: valid],
    error: [Function: error],
    validate: [Function: validate]
  }
}

Instance Methods

These methods are loaded onto each property when the prototype register method is called for that property.

instance[prop].valid([,boolean])

boolean: returns whether or not given property is valid. If argument is given, it will set the current validity to that argument. It gets reset the next time the validation function executes.

example

var p = new Person('foo', 100);

p.name.valid();
// return false

p.name.valid(true);
// return true

p.name.validate();
// return false

p.name.valid();
// return false

instance[prop].error()

string: Returns the error message for the given property, if the property is invalid. Default: 'Invalid ' + prop.

example

var p = new Person('foo', 1000);

p.error();
// return 'Name must be atleast 4 characters

instance[prop].validate()

boolean: calls the validation function for the respective property and returns if valid

example

p = new Person('Odin', 100);

p.name.valid();
// return true
p.name.validate();
// return true

p.name.valid(false)
// return false

p.name.validate()
// return true
p.name.valid()
// return true

Validation scheme

How do you add a validation function and error message to a property? The convention currently in place is to just add those methods/error message to the prototype using the keyword valid_ + attribute.
The validation function gets called everytime the attribute changes. The error message gets printing out when calling instance[prop].error() if the attribute is invalid.

example

class Person extends Arya {
  constructor(name) {
    super();
    this.register('name', name);
  }
}

Person.prototype.valid_name = {
  func: function(name) {
    return name && name.length > 2;
  },
  error: 'Name must be at least 3 characters'
};

Contributing

Issues, and pull requests welcome

1. Fork it
2. Create your feature branch (git checkout -b feature/my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin feature/my-new-feature)
5. Create a new Pull Request