123 lines
3.8 KiB
JavaScript
123 lines
3.8 KiB
JavaScript
import Ember from 'ember';
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// SelectiveSaveMixin adds a saveOnly method to a DS.Model.
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//
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// saveOnly provides a way to save one or more properties of a model while
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// preserving outstanding changes to other properties.
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var SelectiveSaveMixin = Ember.Mixin.create({
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saveOnly: function () {
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if (arguments.length === 0) {
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return Ember.RSVP.resolve();
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}
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if (arguments.length === 1 && Ember.isArray(arguments[0])) {
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return this.saveOnly.apply(this, Array.prototype.slice.call(arguments[0]));
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}
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var propertiesToSave = Array.prototype.slice.call(arguments),
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changed,
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hasMany = {},
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belongsTo = {},
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self = this;
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changed = this.changedAttributes();
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// disable observers so we can make changes to the model but not have
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// them reflected by the UI
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this.beginPropertyChanges();
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// make a copy of any relations the model may have so they can
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// be reapplied later
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this.eachRelationship(function (name, meta) {
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if (meta.kind === 'hasMany') {
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hasMany[name] = self.get(name).slice();
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return;
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}
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if (meta.kind === 'belongsTo') {
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belongsTo[name] = self.get(name);
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return;
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}
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});
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try {
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// roll back all changes to the model and then reapply only those that
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// are part of the saveOnly
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self.rollback();
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propertiesToSave.forEach(function (name) {
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if (hasMany.hasOwnProperty(name)) {
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self.get(name).clear();
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hasMany[name].forEach(function (relatedType) {
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self.get(name).pushObject(relatedType);
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});
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return;
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}
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if (belongsTo.hasOwnProperty(name)) {
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return self.updateBelongsTo(name, belongsTo[name]);
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}
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if (changed.hasOwnProperty(name)) {
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return self.set(name, changed[name][1]);
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}
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});
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}
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catch (err) {
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// if we were not able to get the model into the correct state
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// put it back the way we found it and return a rejected promise
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Ember.keys(changed).forEach(function (name) {
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self.set(name, changed[name][1]);
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});
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Ember.keys(hasMany).forEach(function (name) {
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self.updateHasMany(name, hasMany[name]);
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});
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Ember.keys(belongsTo).forEach(function (name) {
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self.updateBelongsTo(name, belongsTo[name]);
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});
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self.endPropertyChanges();
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return Ember.RSVP.reject(new Error(err.message || 'Error during saveOnly. Changes NOT saved.'));
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}
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return this.save().finally(function () {
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// reapply any changes that were not part of the save
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Ember.keys(changed).forEach(function (name) {
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if (propertiesToSave.hasOwnProperty(name)) {
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return;
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}
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self.set(name, changed[name][1]);
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});
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Ember.keys(hasMany).forEach(function (name) {
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if (propertiesToSave.hasOwnProperty(name)) {
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return;
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}
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self.updateHasMany(name, hasMany[name]);
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});
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Ember.keys(belongsTo).forEach(function (name) {
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if (propertiesToSave.hasOwnProperty(name)) {
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return;
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}
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self.updateBelongsTo(name, belongsTo[name]);
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});
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// signal that we're finished and normal model observation may continue
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self.endPropertyChanges();
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});
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}
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});
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export default SelectiveSaveMixin;
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