Created
May 22, 2015 22:25
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A client-side comparator generating function for Backbone collections
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| /** | |
| * This method creates a new comparator function that should correctly sort by the right field in the correct order | |
| * assuming the sorting is specified by a single field with a "attributeName-asc/desc" format. Add as a change handler | |
| * for your sortBy field, add `this.on('sync', this.sort)` to the collection, and you're ready to go. | |
| * @param {Backbone.Model} model | |
| * @param {string} newSortBy | |
| * @deprecated | |
| */ | |
| updateCollectionComparator: function(model, newSortBy) { | |
| var theCollection = this.someCollection, // change this line | |
| parts = newSortBy.split('-'), | |
| fieldPart = parts[0], | |
| attrName = fieldPart.charAt(0).toLowerCase() + fieldPart.slice(1), | |
| dir = parts[1].toLowerCase(); | |
| theCollection.comparator = function (one, two) { | |
| var oneVal = one.get(attrName), | |
| oneId = one.id, | |
| twoVal = two.get(attrName), | |
| twoId = two.id; | |
| // If all else is equal, sort by aggregateVersion | |
| if (oneVal === twoVal) { | |
| if (oneId === twoId) { return 0; } | |
| if (dir === 'asc') { | |
| return oneId < twoId ? -1 : 1; | |
| } else { | |
| return oneId > twoId ? -1 : 1; | |
| } | |
| } | |
| if (dir === 'asc') { | |
| return oneVal < twoVal ? -1 : 1; | |
| } else { | |
| return oneVal > twoVal ? -1 : 1; | |
| } | |
| }; | |
| this.console.log('Updated event collection to sort %s on %s', dir, attrName); | |
| } |
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