actual method

putComposition() {
    this.basicService.putComposition(JSON.stringify({
      "ctx/time": "2014-3-19T13:10Z",
      "ctx/language": "en",
      "ctx/territory": "CA",
      [Object.keys(this.formConfig.values)[0]]: this.formConfig.values[Object.keys(this.formConfig.values)[0]]
    }))
      .subscribe(console.log);

  }