django forms non_field_errors customizing

Question

I want to have my own errors in django forms but I cant . as you can see I define my own error_messages but django is still using Its own errors.

app account / forms.py:

from django import forms


error_messages_email = {
    'required': 'please Fill-out this field',
    'invalid': 'invalid format for email',
    'max_length': 'max length is 40 chars',
}
error_messages = {
    'required': 'please Fill-out this field',
    'invalid': 'fields format is not valid',
    'max_length': 'max_length is 30 chars',
    'min_length': 'password should be at least 8 Chars',
}


class LoginForm(forms.Form):
    username = forms.CharField(error_messages=error_messages, max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control',
                                                             'placeholder': 'Username'}))
    password = forms.CharField(error_messages=error_messages, min_length=8, max_length=30,
                               widget=forms.PasswordInput(attrs={'class': 'form-control',
                                                                 'placeholder': 'Password'}))


class SignupForm(forms.Form):
    username = forms.CharField(error_messages=error_messages, max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control',
                                                             'placeholder': 'Username'}))

    email = forms.EmailField(error_messages=error_messages_email, max_length=40,
                             widget=forms.EmailInput(attrs={'class': 'form-control',
                                                            'placeholder': 'Email'}))

    password = forms.CharField(error_messages=error_messages, min_length=8, max_length=30,
                               widget=forms.PasswordInput(attrs={'class': 'form-control',
                                                                 'placeholder': 'Password'}))

and this is my apps template / signup.html:

{% extends 'main.html' %}

{% block title %} Join {% endblock %}


{% block content %}

    <form action="" method="post">
        {% csrf_token %}
        {{ form.non_field_errors }}


            {{ form.username.errors }}
            <label for="{{ form.username.id_for_label }}">Username:</label>
            {{ form.username }}<br>


            {{ form.email.errors }}
            <label for="{{ form.email.id_for_label }}">E-mail:</label>
            {{ form.email }}<br>


            {{ form.password.errors }}
            <label for="{{ form.password.id_for_label }}">Password:</label>
            {{ form.password }}<br>

        <input type="submit" value="signup" class="btn btn-primary" >

    </form>

{% endblock %}

the only problem is the errors other parts are working properly, in the browser I also change max_length to 50 and pass it a 50-char password and submit it and it works fine and shows my own error.

Answer 1

You can only use the error_messages keyword argument for a Model or a ModelForm.

As you're just using the standard Form this will not present the behaviour you're expecting.

You would need to change your LoginForm to inherit ModelForm. For example:

class LoginForm(forms.ModelForm):
    username = forms.CharField(error_messages=error_messages, max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control',
                                                             'placeholder': 'Username'}))
    password = forms.CharField(error_messages=error_messages, min_length=8, max_length=30,
                               widget=forms.PasswordInput(attrs={'class': 'form-control',
                                                                 'placeholder': 'Password'}))

    class Meta:
        model=User
        fields = ('username','password')