backbone-typed

Run-time type support for backbone models

Backbone-Typed extends the Backbone model and provides an optional Type system on top of the default models. The system is provided in run time, and is optimistic, if the value can be converted to the needed type it will, if not, it will be nulled and logged

Examples writtein in Coffee-Script but source is compiled to JS so no need to have CS installed at run time.

Installation

npm install backbone-typed

Usage

typed = require 'backbone-typed'
TypedModel = typed.TypedModel
Types = typed.Types

Features

 
enumLike : {
    "OPTION_1"
    "OPTION_2"
    "OPTION_3"
    "OPTION_4"
}
 
class MyTypedModel extends TypedModel
    defaults : { 
        param1: null, 
        param2: null, 
        param3: null 
    }
    types : {
        param1: Types.String, 
        param2: Types.Integer, 
        param3: Types.Enum(enumLike)
    }
 
 
myTypedModel = new MyTypedModel({param1: "im a string", param2: "1337", param3: enumLike.OPTION_1})
 
console.log myTypedModel.toJSON()
=> { param1: "im a string", param2: 1337, param3: "OPTION_1" }
 
# now things get interesting... 
 
myTypedModel2 = new MyTypedModel({param1: 100, param2: "bzzzz", param3: "NOT A REAL OPTION"})
 
console.log myTypedModel2.toJSON()
=> backbone-typed :: 2012-9-13 20:10:3.235 :: ERROR :: backbone-typed nulled value of:"param2" value:"bzzzz" type:"Integer"
=> backbone-typed :: 2012-9-13 20:10:3.235 :: ERROR :: backbone-typed nulled value of:"param3" value:"NOT A REAL OPTION" type:"Enum"
=> { param1: "100", param2: null, param3: null }
 

Creating your own type!

Sometimes its useful to have your own method that validates input and returns some output. Backbone-typed provides a method that "signs" the passed function, so that we know its there in purpose, and will even return its name if the ".toString()" of said function is called.

# we sign the function 
myType = typed.signTypeFunction "Custom",(param)->
    return if param is "its me!" then "yes"  else null
 
# now use it in a model 
class CustomTyped extends TypedModel
    defaults : {  testMe : null }
    types : { testMe : myType }
 

More examples in specs.

Future

Libraries of additional types

License

MIT