Using Backbone to Handle Different Data Formats

I have a unique text file containing date-time data in the format below:

2014-03-14T16:32
2014-03-15T13:04
2014-03-16T06:44
...

I want to use this static file as a read-only data source for my backbone collection. However, the current format is not suitable for direct consumption. My initial approach was to utilize the parse method in my collection to transform it into an array of objects. Unfortunately, this strategy has faced some obstacles.

Firstly, without overriding fetch, the parse method does not get invoked properly and triggers an error handler instead. The reason behind this behavior is unclear, as no actual errors are being thrown. I suspect that it may be due to expecting a different response type.

Secondly, even when both fetch and parse methods are overridden as shown below:

var MyColl = Backbone.Collection.extend({
    model: MyModel,
    url: 'date-list.txt',
    parse: function(data) {
        var result = _(data.split("\n")).compact().map(function(item, i) { 
            return { theDate: item, globalIndex: i };
        });
        return result;
    },
    fetch: function() {
        $.get(this.url, this.parse);
    }
});

Although the parse function correctly processes the data and constructs valid objects, the resulting collection remains empty after completion. It appears that invoking parse outside the expected flow leads to the data not being utilized. Are there any alternative strategies to ensure fetch handles the server response appropriately?

While options like having the server provide JSON or implementing a custom fetching function externally exist, I am exploring possibilities within the bounds of backbone itself before resorting to those solutions.

Answer №1

By default, the fetch method expects JSON to be returned from the endpoint. This JSON data is then used by the collection to create a new model for each object in the array.

If you want to override this behavior, you can simply build an array of Backbone models within your parse method:

parse: function(data) {
  var model = this.model;
   var result = _(data.split("\n")).compact().map(function(item, i) { 
    return new model({ theDate: item, globalIndex: i });
  });

  return result;
},

Answer №2

Seems like there might be an issue with the function being passed to $.get, or more specifically, it could be the correct function but not bound to a specific object instance. One potential solution is to try this approach:

$.get(this.url, _.bind(this.parse, this));

However, as you pointed out, currently nothing is being done with the result of the parse method. To address this, you can modify your code to add elements to the collection in the following way:

parse: function(data) {
    var result = _(data.split("\n")).compact().map(function(item, i) { 
        return { theDate: item, globalIndex: i };
    });
    this.set(result);
}

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