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name : forms.py
 """Models."""
from astroid.nodes import Assign, AssignName, ClassDef
from pylint.checkers import BaseChecker
from pylint.checkers.utils import check_messages
from pylint.interfaces import IAstroidChecker

from pylint_django.__pkginfo__ import BASE_ID
from pylint_django.utils import node_is_subclass


def _get_child_meta(node):
    for child in node.get_children():
        if isinstance(child, ClassDef) and child.name == "Meta":
            return child
    return None


class FormChecker(BaseChecker):
    """Django model checker."""

    __implements__ = IAstroidChecker

    name = "django-form-checker"
    msgs = {
        f"W{BASE_ID}04": (
            "Use explicit fields instead of exclude in ModelForm",
            "modelform-uses-exclude",
            "Prevents accidentally allowing users to set fields, especially when adding new fields to a Model",
        )
    }

    @check_messages("modelform-uses-exclude")
    def visit_classdef(self, node):
        """Class visitor."""
        if not node_is_subclass(node, "django.forms.models.ModelForm", ".ModelForm"):
            # we only care about forms
            return

        meta = _get_child_meta(node)

        if not meta:
            return

        for child in meta.get_children():
            if not isinstance(child, Assign) or not isinstance(child.targets[0], AssignName):
                continue

            if child.targets[0].name == "exclude":
                self.add_message(f"W{BASE_ID}04", node=child)
                break
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