To change particular model data in collection in backbone.js

Collection Defination

Contents = Backbone.Collection.extend({  
  model : Content,
  initialize: function(models, args) {
        console.log('in contents'+this.length);
    },
  content: function(objectid) {
    return this.filter(function(content){ return content.get('objectid')==objectid; });
  }
});

To change the model data

 var model=Contents.content(data.objectid)[0];
    model.set(data);

Ref :

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