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//allows you to backup and restore a model instance
steal('jquery/model').then(function($){
var isArray = $.isArray,
propCount = function(obj){
var count = 0;
for(var prop in obj) count++;
return count;
},
same = function(a, b, deep){
var aType = typeof a,
aArray = isArray(a);
if(deep === -1){
return aType === 'object' || a === b;
}
if(aType !== typeof b || aArray !== isArray(b)){
return false;
}
if(a === b){
return true;
}
if(aArray){
if(a.length !== b.length){
return false;
}
for(var i =0; i < a.length; i ++){
if(!same(a[i],b[i])){
return false;
}
};
return true;
} else if(aType === "object" || aType === 'function'){
var count = 0;
for(var prop in a){
if(!same(a[prop],b[prop], deep === false ? -1 : undefined )){
return false;
}
count++;
}
return count === propCount(b)
}
return false;
},
flatProps = function(a){
var obj = {};
for(var prop in a){
if(typeof a[prop] !== 'object' || a[prop] === null){
obj[prop] = a[prop]
}
}
return obj;
};
/**
@page jquerymx.model.backup Backup / Restore
@parent jQuery.Model
@plugin jquery/model/backup
@test jquery/model/backup/qunit.html
@download http://jmvcsite.heroku.com/pluginify?plugins[]=jquery/model/backup/backup.js
You can backup and restore instance data with the jquery/model/backup
plugin.
To backup a model instance call [jQuery.Model.prototype.backup backup] like:
@codestart
var recipe = new Recipe({name: "cheese"});
recipe.backup()
@codeend
You can check if the instance is dirty with [jQuery.Model.prototype.isDirty isDirty]:
@codestart
recipe.name = 'blah'
recipe.isDirty() //-> true
@codeend
Finally, you can restore the original attributes with
[jQuery.Model.prototype.backup backup].
@codestart
recipe.restore();
recipe.name //-> "cheese"
@codeend
See this in action:
@demo jquery/model/backup/backup.html
*/
$.extend($.Model.prototype,{
/**
* @function jQuery.Model.prototype.backup
* @parent jquerymx.model.backup
* Backs up an instance of a model, so it can be restored later.
* The plugin also adds an [jQuery.Model.prototype.isDirty isDirty]
* method for checking if it is dirty.
*/
backup: function() {
this._backupStore = this.serialize();
return this;
},
/**
* @function jQuery.Model.prototype.isDirty
* @plugin jquery/model/backup
* @parent jquerymx.model.backup
* Returns if the instance needs to be saved. This will go
* through associations too.
* @return {Boolean} true if there are changes, false if otherwise
*/
isDirty: function(checkAssociations) {
// check if it serializes the same
if(!this._backupStore){
return false;
} else {
return !same(this.serialize(), this._backupStore, !!checkAssociations);
}
},
/**
* @function jQuery.Model.prototype.restore
* @parent jquery.model.backup
* restores this instance to its backup data.
* @return {model} the instance (for chaining)
*/
restore: function(restoreAssociations) {
var props = restoreAssociations ? this._backupStore : flatProps(this._backupStore)
this.attrs(props);
return this;
}
})
})