title: How should I trigger a UI render update from a state change in a reactjs flux app?
body: <p>If I'm doing field validation in say a login form field, if it's missing a required field should I trigger the error message in the rendered view by either</p>
  
  <p>a. update this.state.errorMessage in the component and then trigger a render somehow?</p>
  
  <p>OR</p>
  
  <p>b. raise a loginError action, which then updates the store with an errormessage and let that trigger a state update and then the render in the component</p>