通知是任何現(xiàn)代 Web 應(yīng)用程式的關(guān)鍵組成部分，可確保使用者了解情況並參與其中。實施良好的通知系統(tǒng)可以處理多個管道，例如應(yīng)用程式內(nèi)警報、電子郵件和短信，同時動態(tài)自訂內(nèi)容以實現(xiàn)無縫的用戶體驗。在本指南中，我們將引導(dǎo)您在 Django 中建立一個強大的、可擴展的通知系統(tǒng)。

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系統(tǒng)功能

我們的通知系統(tǒng)旨在提供：

1. 支援多管道：透過應(yīng)用程式內(nèi)提醒、電子郵件或簡訊發(fā)送通知。
2. 動態(tài)內(nèi)容個人化：帶有佔位符的模板，用於產(chǎn)生個人化訊息。
3. 基於事件的觸發(fā)器：根據(jù)特定係統(tǒng)或使用者事件觸發(fā)通知。
4. 狀態(tài)追蹤：監(jiān)控電子郵件和簡訊通知的傳送狀態(tài)。
5. 管理和系統(tǒng)整合：通知可以由管理員或系統(tǒng)事件觸發(fā)。

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定義模型

1.通知範本

範本是我們系統(tǒng)的支柱，儲存可重複使用的通知內(nèi)容。

from django.db import models

class ChannelType(models.TextChoices):
    APP = 'APP', 'In-App Notification'
    SMS = 'SMS', 'SMS'
    EMAIL = 'EMAIL', 'Email'


class TriggeredByType(models.TextChoices):
    SYSTEM = 'SYSTEM', 'System Notification'
    ADMIN = 'ADMIN', 'Admin Notification'


class TriggerEvent(models.TextChoices):
    ENROLLMENT = 'ENROLLMENT', 'Enrollment'
    ANNOUNCEMENT = 'ANNOUNCEMENT', 'Announcement'
    PROMOTIONAL = 'PROMOTIONAL', 'Promotional'
    RESET_PASSWORD = 'RESET_PASSWORD', 'Reset Password'

class NotificationTemplate(models.Model):
    title = models.CharField(max_length=255)
    template = models.TextField(help_text='Use placeholders like {{username}} for personalization.')
    channel = models.CharField(max_length=20, choices=ChannelType.choices, default=ChannelType.APP)
    triggered_by = models.CharField(max_length=20, choices=TriggeredByType.choices, default=TriggeredByType.SYSTEM)
    trigger_event = models.CharField(max_length=50, choices=TriggerEvent.choices, help_text='Event that triggers this template.')
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

主要特點：

• 模板：帶有動態(tài)值佔位符的文本，例如 {{username}}.
• 頻道：指定是電子郵件、簡訊或應(yīng)用程式內(nèi)通知。
• trigger_event：將範本與特定事件關(guān)聯(lián)。

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2.一般通知

通知模型將模板連結(jié)到使用者並儲存任何動態(tài)負載以進行個人化。

class Notification(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="notifications")
    content = models.ForeignKey(NotificationTemplate, on_delete=models.CASCADE, related_name="notifications")
    payload = models.JSONField(default=dict, help_text="Data to replace template placeholders.")
    is_read = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)

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3.特定於渠道的模型

為了獨特地處理電子郵件和短信，我們定義了特定的模型。

電子郵件通知

此模型管理特定於電子郵件的數(shù)據(jù)，例如動態(tài)訊息產(chǎn)生和傳遞追蹤。

class StatusType(models.TextChoices):
    PENDING = 'PENDING', 'Pending'
    SUCCESS = 'SUCCESS', 'Success'
    FAILED = 'FAILED', 'Failed'

class EmailNotification(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='email_notifications')
    content = models.ForeignKey(NotificationTemplate, on_delete=models.CASCADE, related_name='email_notifications')
    payload = models.JSONField(default=dict)
    status = models.CharField(max_length=20, choices=StatusType.choices, default=StatusType.PENDING)
    status_reason = models.TextField(null=True)

    @property
    def email_content(self):
        """
        Populate the template with dynamic data from the payload.
        """
        content = self.content.template
        for key, value in self.payload.items():
            content = re.sub(
                rf"{{{{\s*{key}\s*}}}}",
                str(value),
                content,
            )
        return content

簡訊通知

與電子郵件通知類似，這裡實現(xiàn)了簡訊特定邏輯。

class SMSNotification(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='sms_notifications')
    content = models.ForeignKey(NotificationTemplate, on_delete=models.CASCADE, related_name='sms_notifications')
    payload = models.JSONField(default=dict)
    status = models.CharField(max_length=20, choices=StatusType.choices, default=StatusType.PENDING)
    status_reason = models.TextField(null=True)

    @property
    def sms_content(self):
        """
        Populate the template with dynamic data from the payload.
        """
        content = self.content.template
        for key, value in self.payload.items():
            content = re.sub(
                rf"{{{{\s*{key}\s*}}}}",
                str(value),
                content,
            )
        return content

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管理整合

為了更輕鬆地管理通知，我們在 Django 管理面板中註冊模型。

from django.contrib import admin
from notifier.models import NotificationTemplate

@admin.register(NotificationTemplate)
class NotificationTemplateAdmin(admin.ModelAdmin):
    list_display = ['title', 'channel', 'triggered_by', 'trigger_event', 'is_active']
    list_filter = ['channel', 'triggered_by', 'is_active']
    search_fields = ['title', 'trigger_event']

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通知服務(wù)

我們將實作一個服務(wù)層來管理透過各種管道發(fā)送通知。

策略模式

使用策略模式，我們將為每個通知頻道定義類別。

from django.db import models

class ChannelType(models.TextChoices):
    APP = 'APP', 'In-App Notification'
    SMS = 'SMS', 'SMS'
    EMAIL = 'EMAIL', 'Email'


class TriggeredByType(models.TextChoices):
    SYSTEM = 'SYSTEM', 'System Notification'
    ADMIN = 'ADMIN', 'Admin Notification'


class TriggerEvent(models.TextChoices):
    ENROLLMENT = 'ENROLLMENT', 'Enrollment'
    ANNOUNCEMENT = 'ANNOUNCEMENT', 'Announcement'
    PROMOTIONAL = 'PROMOTIONAL', 'Promotional'
    RESET_PASSWORD = 'RESET_PASSWORD', 'Reset Password'

class NotificationTemplate(models.Model):
    title = models.CharField(max_length=255)
    template = models.TextField(help_text='Use placeholders like {{username}} for personalization.')
    channel = models.CharField(max_length=20, choices=ChannelType.choices, default=ChannelType.APP)
    triggered_by = models.CharField(max_length=20, choices=TriggeredByType.choices, default=TriggeredByType.SYSTEM)
    trigger_event = models.CharField(max_length=50, choices=TriggerEvent.choices, help_text='Event that triggers this template.')
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

通知服務(wù)

該服務(wù)將所有內(nèi)容連結(jié)在一起，根據(jù)通知管道選擇適當?shù)牟呗浴?

class Notification(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name="notifications")
    content = models.ForeignKey(NotificationTemplate, on_delete=models.CASCADE, related_name="notifications")
    payload = models.JSONField(default=dict, help_text="Data to replace template placeholders.")
    is_read = models.BooleanField(default=False)
    created_at = models.DateTimeField(auto_now_add=True)

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使用範例

以下是如何使用通知服務(wù)：

class StatusType(models.TextChoices):
    PENDING = 'PENDING', 'Pending'
    SUCCESS = 'SUCCESS', 'Success'
    FAILED = 'FAILED', 'Failed'

class EmailNotification(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='email_notifications')
    content = models.ForeignKey(NotificationTemplate, on_delete=models.CASCADE, related_name='email_notifications')
    payload = models.JSONField(default=dict)
    status = models.CharField(max_length=20, choices=StatusType.choices, default=StatusType.PENDING)
    status_reason = models.TextField(null=True)

    @property
    def email_content(self):
        """
        Populate the template with dynamic data from the payload.
        """
        content = self.content.template
        for key, value in self.payload.items():
            content = re.sub(
                rf"{{{{\s*{key}\s*}}}}",
                str(value),
                content,
            )
        return content

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