Saving models with only changed attributes/relationships

Ember Data
2

You can do this by overriding the serializer.

Hummingbird.ApplicationSerializer = DS.ActiveModelSerializer.extend
  serialize: (record, options) ->
    json = {}

    if options and options.includeId
      if record.get('id')
        json[this.get('primaryKey')] = record.get('id')

    changedAttributes = Object.keys record.get('_inFlightAttributes')

    record.eachAttribute (key, attribute) ->
      if changedAttributes.indexOf(key) != -1
        @serializeAttribute(record, json, key, attribute)
    , this

    record.eachRelationship (key, relationship) ->
      if relationship.kind == 'belongsTo'
        @serializeBelongsTo(record, json, relationship)
      else if relationship.kind == 'hasMany'
        @serializeHasMany(record, json, relationship)
    , this

    json
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