python全栈开发day82-modelForm

1.jsonp内容

　　

from django.shortcuts import render

# Create your views here.


def upload(request):
    if request.method == "POST":
        file_obj = request.FILES.get("file")
        with open(file_obj.name, "wb") as f:
            for chunk in file_obj.chunks():
                f.write(chunk)
        # 已经将文件保存在服务端，现在开始进行代码统计
        code_line = 0
        comment_line = 0
        flag = False
        with open(file_obj.name, "r", encoding="utf8") as f2:
            for line in f2:
                if line.strip():
                    if flag and not line.strip().startswith('"""'):
                        comment_line += 1
                    else:
                        if line.strip().startswith("#"):
                            comment_line += 1
                        elif line.strip().startswith('"""'):
                            if not flag:
                                flag = True
                            else:
                                flag = False
                            comment_line += 1
                        else:
                            code_line += 1
        return render(request, "show.html", {"filename": file_obj.name, "code_line": code_line, "comment_line": comment_line})
    return render(request, "upload.html")

2.modelForm

    1. modelform ：https://www.cnblogs.com/liwenzhou/p/8747872.html
    
        1. 手敲代码实现书籍表的增改查
        2. 用form组件实现增改查
            1. 在页面展示html时
                {% for filed in form_obj %}
                    <p>
                    {{ filed.label }}
                    {{ filed }}
                    </p>
                {% endfor %}
    
            2. ChoiceField -> ModelChoiceField -> ModelMultipleChoiceField
                1. ModelChoiceField
                    生成select标签
                    option选项是从queryset中获取的
                2. ModelMultipleChoiceField
                    生成多选的select标签
                    option选项是从queryset中获取
    
            3. form_obj如何设置初始化的值
                from django.forms.models import model_to_dict  --> Django 内置的把ORM对象转换成字典的工具函数
                obj_dict = model_to_dict(book_obj)
                form_obj = forms.BookForm(initial=obj_dict)
    
    
        3. 使用modelform来做书籍的增改查
            class BookModelForm(forms.ModelForm):
            
                class Meta:
                    # 告诉Django这个form类和那个model类对应
                    model = models.Book
                    # 告诉Django这个form类里面有哪些字段
                    # fields = "__all__"
                    # fields = ["title", "price"]
                    exclude = ["authors"]
                    widgets = {
                        "publish_date": forms.widgets.DateInput(
                            attrs={"type": "date", "class": "form-control"}
                        )
                    }
                    labels = {
                        "title": "书名",
                        "price": "价格"
                    }
                    error_messages = {
                        "title": {
                            "required": "书名不能为空"
                        }
                    }

    2. Django logging模块的使用：https://www.cnblogs.com/liwenzhou/p/8763264.html