Forms, tables, throwing validation error [Solved]

Question

So I've mastered copying from a video and have built the social app, which seems to work just as it should.

However, I'm now trying to apply the learning and create some additional tables, forms etc and I'm getting some errors I can't understand. I'll try to explain what I'm doing and include the code.

I created what I think is a model/function in app.py that will create a route to the form and validate on submission.
I created the html template that the user will submit the data through.
I created the function/class method that creates the database table and process the form data.
I've created the python forms to go with the html template

When I run the app, I get the following error:

Traceback (most recent call last):
  File "app.py", line 7, in <module>
    import forms
  File "D:\Dropbox\Coding Projects\learner-driver-app\forms.py", line 62, in <module>
    class StandardForm(FlaskForm):
  File "D:\Dropbox\Coding Projects\learner-driver-app\forms.py", line 64, in StandardForm
    standard = TextAreaField('Enter the standard to be added', validators=[DataRequired])
  File "D:\business\python-development\anaconda3\lib\site-packages\wtforms\fields\core.py", line 33, in __new__
    return UnboundField(cls, *args, **kwargs)
  File "D:\business\python-development\anaconda3\lib\site-packages\wtforms\fields\core.py", line 384, in __init__
    self.field_class.check_validators(validators)
  File "D:\business\python-development\anaconda3\lib\site-packages\wtforms\fields\core.py", line 185, in check_validators
    raise TypeError(
TypeError: <class 'wtforms.validators.DataRequired'> is not a valid validator because it is a class, it should be an instance

The error makes me think that I've incorrectly created the forms and validators, but I have copied these from other forms created in the social app. So I can't see why they would cause an error. So I'm wondering if this is one of those situations where the error is not the actual error but rather a stalling point. I've tried to read the documention and look on stack overflow, but I can't find anything the same or that makes it clear what the error is.

I am including my code below. Just the bit's I have built, not the entire files as that's lot's of code! However, if anyone feels it necessary to helping me fix the problems then I can include it later.

Also, an additional error is that my template "standards.html" throws a 404 error. Again I've copied the format from another function so not sure why it doesn't find the template.

Thanks in advance.

app.py

@app.route('/add_standard', methods=('GET', 'POST'))
@login_required
def set_standard():
    form = forms.StandardForm()
    if form.validate_on_submit():
        models.Standards.create(user=g.user._get_current_object(),
                                content=form.content.data.strip())
        flash("Standard created! Thanks!", "success")
        return redirect(url_for('index'))
    return render_template('standards.html', form=form)

models.py

class Standards(Model):
    section = CharField(unique=False)
    standard = CharField(unique=True)

    class Meta:
        database = DATABASE


    @classmethod
    def create_standard(cls, section, standard):
        try:
            with DATABASE.transaction():
                cls.create(
                    section=section,
                    standard=standard
                )
        except IntegrityError:
            raise ValueError("Standard already exists")


class Faults(Model):
    section = CharField()
    fault = CharField()

    class Meta:
        database = DATABASE


    @classmethod
    def create_faults(cls, section, fault):
        try:
            with DATABASE.transaction():
                cls.create(
                    section=section,
                    fault=fault
                    )
        except IntegrityError:
            raise ValueError("Fault already exists")

forms.py

class StandardForm(FlaskForm):
    section = TextAreaField('Set section title', validators=[DataRequired()])
    standard = TextAreaField('Enter the standard to be added', validators=[DataRequired])


class FaultForm(FlaskForm):
    section = TextAreaField('Set section title', validators=[DataRequired])
    fault = TextAreaField('Enter fault', validators=[DataRequired])

standards.html

{% extends "layout.html" %} {% from 'macros.html' import render_field %} {% block content %}
<form method="POST" action="">
    {{ form.hidden_tag() }} {% for field in form %} {{ render_field(field) }} {% endfor %}
    <button type="submit" id="submit">Add Standard</button>
</form>
{% endblock %}

Any questions, please ask and I'll give whatever info I can :)

Answer 1 · 2021-11-29T23:31:14Z

November 29, 2021 11:31pm

Jason Larson - I've loved the videos, because the trainers are all pretty engaging and compared to many sites, it feels more like a classroom learning session. But I totally agree, there is something missing which is the application of the learners own lateral thinking in coding, testing and error resolution. Hugely satisfying to know you've fixed something yourself. Even more satisfying when you created your own code and then managed to fix it, without help.

I think treehouse would benefit their users a lot by introducing the codewars type thing. Maybe give students an opportunity to form code hubs, where they collectively work on code challenges. I used to find my university study group invaluable for aiding my understanding of theory.

Thanks for your comment and advice. :)

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