Django admin 에서 Custom Action Page 만들기

@admin.register(Coupon)
class CouponAdmin(admin.ModelAdmin):
    ..(생략)..

    change_list_template = "change_list.html"

{% extends "admin/change_list.html" %}
{% block object-tools-items %}
    {{ block.super }}
    <li>
        <a href="{% url 'admin:bulk_coupon' %}" class="button">쿠폰 일괄 발행</a>
    </li>
{% endblock %}

@admin.register(Coupon)
class CouponAdmin(admin.ModelAdmin):
		...(생략)...

    def get_urls(self):
        def wrap(view):
            def wrapper(*args, **kwargs):
                return self.admin_site.admin_view(view)(*args, **kwargs)
            wrapper.model_admin = self
            return update_wrapper(wrapper, view)

        check = [
            path("bulk_coupon/", wrap(self.bulk_coupon_view), name="bulk_coupon"),
            *super().get_urls(),
        ]
        return check

@admin.register(Coupon)
class CouponAdmin(admin.ModelAdmin):
		...(생략)...

    def bulk_coupon_view(self, request):
        form = BulkCouponForm(request.POST or None)
        if request.method == "POST" and form.is_valid():
            users = form.cleaned_data["users"]
            name = form.cleaned_data["name"]
            discount_type = form.cleaned_data["discount_type"]
            value = form.cleaned_data["value"]
            description = form.cleaned_data["description"]
            valid_from = form.cleaned_data.get("valid_from", None)
            valid_to = form.cleaned_data.get("valid_to", None)

            try:
                Coupon.objects.bulk_create(
                    [
                        Coupon(
                            user_id=user,
                            name=name,
                            discount_type=discount_type,
                            value=value,
                            description=description,
                            valid_from=valid_from,
                            valid_to=valid_to,
                        )
                        for user in users
                    ]
                )
                messages.success(request, f"{len(users)}에게 쿠폰이 성공적으로 발행되었습니다.")
            except Exception as e:
                messages.error(request, f"쿠폰 발행에 실패했습니다.{e}")
            return redirect("admin:index")
        return render(request, "bulk_coupon.html", {"form": form})

from django import forms

from app.coupon.models import CouponNameChoice, DiscountTypeChoice
from app.user.models import User

class BulkCouponForm(forms.Form):
    users = forms.MultipleChoiceField(label="쿠폰을 발행할 유저", widget=forms.CheckboxSelectMultiple)
    name = forms.ChoiceField(label="쿠폰 타입")
    discount_type = forms.ChoiceField(label="발행할 쿠폰 할인 유형", help_text="(정가는 정해진 금액이 할인, 정률은 %로 할인 됩니다.)")
    value = forms.IntegerField(
        label="할인 값", widget=forms.NumberInput(), help_text="(ex: 50   1.정가인 경우:50원 할인 2.정률인 경우:50 % 할인)"
    )
    description = forms.CharField(max_length=256, label="쿠폰 설명(256자 제한)", widget=forms.Textarea)
    valid_from = forms.DateField(
        label="유효 시작 기간",
        required=False,
        widget=forms.DateInput(attrs={"type": "date"}),
        help_text="(날짜를 선택하지 않으면 무기한 쿠폰입니다.)",
    )
    valid_to = forms.DateField(label="유효 종료 기간", required=False, widget=forms.DateInput(attrs={"type": "date"}))

    def __init__(self, *args, **kwargs):
        super(BulkCouponForm, self).__init__(*args, **kwargs)
        self.fields["users"].choices = [
            (user.pk, f"이름 : {user.name} / 닉네임 : {user.nick_name}") for user in User.objects.all()
        ]
        self.fields["name"].choices = CouponNameChoice.choices
        self.fields["discount_type"].choices = DiscountTypeChoice.choices

    def clean(self):
        cleaned_data = super().clean()
        if cleaned_data.get("value", 0) < 0:
            self.add_error("value", "0 이상의 값을 입력하세요.")
        if cleaned_data.get("discount_type") == DiscountTypeChoice.PERCENTAGE and cleaned_data.get("value", 0) > 100:
            self.add_error("value", "100이하의 퍼센트 값을 입력하세요.")
        if (cleaned_data.get("valid_from") and cleaned_data.get("valid_to")) and (
            cleaned_data.get("valid_from") > cleaned_data.get("valid_to")
        ):
            self.add_error("valid_to", "유효 종료 시간이 유효 시작 시간 보다 늦도록 입력하세요.")
        return cleaned_data

{% extends "admin/base_site.html" %}
{% block content %}
<style>
    /* 스타일은 생략 */
</style>

<script>
    document.addEventListener('DOMContentLoaded', function () {
        document.getElementById('select-all').addEventListener('change', function () {
            var isChecked = this.checked;
            document.querySelectorAll('input[name="users"]').forEach(function (checkbox) {
                checkbox.checked = isChecked;
            });
        });
    });
</script>

<div class="admin-form-container">
    <div class="admin-form">
        <h1>쿠폰 일괄 발행</h1>
        <form method="post">
            {% csrf_token %}
            <div>
                <label><input type="checkbox" id="select-all"> 전체 선택</label>
            </div>
            {{ form.as_p }}

            <button type="submit" class="custom-submit-button">발행하기</button>
            <button type="button" style="background-color: #888; margin-top: 25px;" onclick="history.back();">뒤로 가기</button>
        </form>
    </div>
</div>
{% endblock %}