FluidValidator

Description

FluidValidator is intended to encapsulate validation logic. The API was designed with FluentValidation (https://github.com/JeremySkinner/FluentValidation) and Rails Validation as reference. Currently offers validation of simple objects, complex objects (object graph), enumerables. Localized error messages. You can easly override base behaviors and/or build your own reusable validation rules.

Usage

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

No special requirements

Installation

FluidValidator is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "FluidValidator"

Usage

A simple object

Given this object:

import Foundation

class Home {
    var isLocked:Bool?
    var number:Int?
    var ownerName:String?
}

Create a custom validator extending AbstractValidator specifing target class Example:

import Foundation
import FluidValidator

class HomeValidator : AbstractValidator<Home> {
    override init() {
        super.init()
               
        self.addValidation(withName: "number") { (context) -> (Any?) in
            context.number
        }.addRule(GreaterThan(limit: 3, includeLimit: false))
        
        self.addValidation(withName: "ownerName") { (context) -> (Any?) in
            context.ownerName
        }.addRule(BeNotEmpty())
        
        self.addValidation(withName: "isLocked") { (context) -> (Any?) in
            context.isLocked
        }.addRule(BeTrue())
    }
}

Nested Objects

Given this more complex object:

import Foundation

class Home {
    var isLocked:Bool?
    var number:Int?
    var ownerName:String?
    var garage: Garage?
}
class Garage {
  var isOpen: Bool?
  var maxCars: Int?
}

The corresponding validator would be implemented this way:

import Foundation
import FluidValidator

class GarageValidator: AbstractValidator<Garage> {
    override init() {
        super.init()
        
        self.addValidation(withName: "isOpen") { (context) -> Any? in
            context.isOpen
        }.addRule(BeTrue())
        
        self.addValidation(withName: "maxCars") { (context) -> Any? in
            context.maxCars
        }.addRule(LessThan(limit: 2, includeLimit: true))
    }
}

class HomeValidator : AbstractValidator<Home> {
    override init() {
        super.init()
        
        ...
        self.addValidation(withName: "garage") { (context) -> (Any?) in
            context.garage
        }.addRule(GarageValidator())
    }
}

Run validations and get result

regardless of your validators complexity, you can run validation process and extract error messages (if any) as showed here

    let garage = Garage()
    garage.isOpen = false

    let home = Home()
    home.isLocked = true
    home.ownerName = "John Doe"
    home.number = 2
    home.garage = garage

    let homeValidator = HomeValidator()
    let result = homeValidator.validate(home)
    let failMessage = homeValidator.allErrors()

Get fail messages

failMessage.failMessageForPath("number")?.errors.first?.compact
failMessage.failMessageForPath("number")?.errors.first?.extended

failMessage.failMessageForPath("garage")?.errors.first?.compact
failMessage.failMessageForPath("garage.isOpen")?.errors.first?.extended

The errors array contains ErrorMessage objects which in turn contains compact and extended error message.

Take a look at Unit Test classes to figure out other features

Author

FrogRain, info@frograin.com

License

FluidValidator is available under the MIT license. See the LICENSE file for more info.