js/libs/ember-data.js
function(record, json, relationship) {
    var key   = relationship.key,
        attrs = get(this, 'attrs'),
        embed = attrs && attrs[key] && attrs[key].embedded === 'always';

    if (embed) {
      json[this.keyForAttribute(key)] = get(record, key).map(function(relation) {
        var data = relation.serialize(),
            primaryKey = get(this, 'primaryKey');

        data[primaryKey] = get(relation, primaryKey);

        return data;
      }, this);
    }
  }
function(record, json, relationship) {
    var key   = relationship.key,
        attrs = get(this, 'attrs'),
        embed = attrs && attrs[key] && attrs[key].embedded === 'always';

    if (embed) {
      json[this.keyForAttribute(key)] = get(record, key).map(function(relation) {
        var data = relation.serialize(),
            primaryKey = get(this, 'primaryKey');

        data[primaryKey] = get(relation, primaryKey);

        return data;
      }, this);
    }
  }
function ( record , json , relationship ) { var key = relationship . key , attrs = get ( this , 'attrs' ) , embed = attrs && attrs [ key ] && attrs [ key ] . embedded === 'always' ; if ( embed ) { json [ this . keyForAttribute ( key ) ] = get ( record , key ) . map ( function ( relation ) { var data = relation . serialize ( ) , primaryKey = get ( this , 'primaryKey' ) ; data [ primaryKey ] = get ( relation , primaryKey ) ; return data ; } , this ) ; } }
Serialize has-may relationship when it is configured as embedded objects.

@method serializeHasMany
Serialize has - may relationship when it is configured as embedded objects .