WTForms getting the errors

user_762174 0
Viewed 30822

Currently in WTForms to access errors you have to loop through field errors like so:

for error in form.username.errors:
        print error

Since I'm building a rest application which uses no form views, I'm forced to check through all form fields in order to find where the error lies.

Is there a way I could do something like:

for fieldName, errorMessage in form.errors:
        ...do something
wtforms flask python
4 Answers

With ModelFormFields in SqlAlchemy when used with WTForms, if you have a nested object inside an object (foreign key relationships), here is how you show the relevant errors for fields properly.

Python side:

def flash_errors(form):
    for field, errors in form.errors.items():
        if type(form[field]) == ModelFormField:
            for error, lines in errors.iteritems():
                description = "\n".join(lines)
                flash(u"Error in the %s field - %s" % (
                    #getattr(form, field).label.text + " " + error,
                    form[field][error].label.text,
                    description
                ))
        else:
            for error, lines in errors.iteritems():
                description = "\n".join(lines)
                flash(u"Error in the %s field - %s" % (
                    #getattr(form, field).label.text + " " + error,
                    form[field].label.text,
                    description
                ))

Jinja side:

  {% with messages = get_flashed_messages(with_categories=true) %}
    {% for message in messages %}
      {% if "Error" not in message[1]: %}
        <div class="alert alert-info">
          <strong>Success! </strong> {{ message[1] }}
        </div>
      {% endif %}

      {% if "Error" in message[1]: %}
        <div class="alert alert-warning">
         {{ message[1] }}
        </div>
      {% endif %}
    {% endfor %}
  {% endwith %}

Hope that helps.

user_9999430
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