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Data Indirection, Massage, and Transformation #103

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30 changes: 26 additions & 4 deletions agility.js
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Original file line number Diff line number Diff line change
Expand Up @@ -980,11 +980,31 @@
id = params.id;
}

// Define post-load/gather data transform. If no indirection specified, return
// data as-is. If a string, represents single-level JSON data offset. If a
// function, that function processes data into locally appropriate data.
function indirect_get(data, indirection) {
if (indirection === undefined || indirection === null) {
return data;
}
return $.isFunction(indirection) ? indirection(data) : data[indirection];
}

// Opposite of indrect_set(). Optional pre-save transform of data to
// massage it into a format acceptable to the server.
function indirect_set(data, indirection) {
if (indirection === undefined || indirection === null) {
return data;
}
return isFunction(indirection) ? indirection(data) : { indirection: data };
}


// Creates persist methods

// .save()
// Creates new model or update existing one, depending on whether model has 'id' property
this.save = function(){
this.save = function(indirection){
var self = this;
if (this._data.persist.openRequests === 0) {
this.trigger('persist:start');
Expand All @@ -993,7 +1013,7 @@
this._data.persist.adapter.call(this, {
type: this.model.get(id) ? 'PUT' : 'POST', // update vs. create
id: this.model.get(id),
data: this.model.get(),
data: indirect_set(this.model.get(), indirection),
complete: function(){
self._data.persist.openRequests--;
if (self._data.persist.openRequests === 0) {
Expand Down Expand Up @@ -1022,7 +1042,7 @@

// .load()
// Loads model with given id
this.load = function(){
this.load = function(indirection){
var self = this;
if (this.model.get(id) === undefined) throw 'agility.js: load() needs model id';

Expand All @@ -1040,6 +1060,7 @@
}
},
success: function(data, textStatus, jqXHR){
data = indirect_get(data);
self.model.set(data);
self.trigger('persist:load:success');
},
Expand Down Expand Up @@ -1086,7 +1107,7 @@

// .gather()
// Loads collection and appends/prepends (depending on method) at selector. All persistence data including adapter comes from proto, not self
this.gather = function(proto, method, selectorOrQuery, query){
this.gather = function(proto, method, selectorOrQuery, query, indirection){
var selector, self = this;
if (!proto) throw "agility.js plugin persist: gather() needs object prototype";
if (!proto._data.persist) throw "agility.js plugin persist: prototype doesn't seem to contain persist() data";
Expand Down Expand Up @@ -1119,6 +1140,7 @@
}
},
success: function(data){
data = indirect_get(data, indirection);
$.each(data, function(index, entry){
var obj = $$(proto, entry);
if (typeof method === 'string') {
Expand Down