通过django实现工作流引擎的搭建
时间: 2023-12-31 19:07:10 浏览: 47
使用Django可以很方便地搭建工作流引擎。下面是一个基本的工作流引擎的实现过程:
1. 安装Django和Django-extensions
```
pip install django
pip install django-extensions
```
2. 创建Django项目和应用
```
django-admin startproject workflow_engine
cd workflow_engine
python manage.py startapp workflow
```
3. 配置数据库和Django-extensions
在`settings.py`中添加:
```python
INSTALLED_APPS = [
# ...
'django_extensions',
'workflow',
]
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': BASE_DIR / 'db.sqlite3',
}
}
```
4. 定义模型
```python
from django.db import models
class Workflow(models.Model):
name = models.CharField(max_length=100)
description = models.TextField()
class WorkflowState(models.Model):
name = models.CharField(max_length=100)
description = models.TextField()
workflow = models.ForeignKey(Workflow, on_delete=models.CASCADE)
class WorkflowTransition(models.Model):
name = models.CharField(max_length=100)
description = models.TextField()
from_state = models.ForeignKey(WorkflowState, on_delete=models.CASCADE, related_name='from_transitions')
to_state = models.ForeignKey(WorkflowState, on_delete=models.CASCADE, related_name='to_transitions')
class WorkflowInstance(models.Model):
current_state = models.ForeignKey(WorkflowState, on_delete=models.CASCADE)
workflow = models.ForeignKey(Workflow, on_delete=models.CASCADE)
class WorkflowInstanceTransition(models.Model):
workflow_instance = models.ForeignKey(WorkflowInstance, on_delete=models.CASCADE)
transition = models.ForeignKey(WorkflowTransition, on_delete=models.CASCADE)
performed_by = models.CharField(max_length=100)
performed_at = models.DateTimeField(auto_now_add=True)
```
5. 创建管理界面
在`admin.py`中添加:
```python
from django.contrib import admin
from .models import Workflow, WorkflowState, WorkflowTransition, WorkflowInstance, WorkflowInstanceTransition
admin.site.register(Workflow)
admin.site.register(WorkflowState)
admin.site.register(WorkflowTransition)
admin.site.register(WorkflowInstance)
admin.site.register(WorkflowInstanceTransition)
```
6. 创建视图和模板
在`views.py`中添加:
```python
from django.shortcuts import render
from .models import WorkflowInstance
def workflow_instance_list(request):
instances = WorkflowInstance.objects.all()
return render(request, 'workflow_instance_list.html', {'instances': instances})
```
在`urls.py`中添加:
```python
from django.urls import path
from .views import workflow_instance_list
urlpatterns = [
path('workflow_instance_list/', workflow_instance_list, name='workflow_instance_list'),
]
```
在`templates`目录下创建`workflow_instance_list.html`文件:
```html
{% extends 'base.html' %}
{% block content %}
<h1>Workflow Instances</h1>
<ul>
{% for instance in instances %}
<li>{{ instance }}</li>
{% empty %}
<li>No workflow instances found.</li>
{% endfor %}
</ul>
{% endblock %}
```
7. 运行Django应用
```
python manage.py makemigrations
python manage.py migrate
python manage.py createsuperuser
python manage.py runserver
```
8. 访问管理界面
在浏览器中访问`http://localhost:8000/admin/`,使用创建的超级用户登录。
9. 访问工作流实例列表
在浏览器中访问`http://localhost:8000/workflow_instance_list/`,可以看到所有的工作流实例。
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