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  • stark组件之展示数据（查）

     
     

    1、编辑按钮构建完成

    1、必备知识预习

    　　

    第一个会打印5.

    第二个输出alex

    alex是person类的实例对象，getattr()的用法就是alex拥有s方法的话，那么就执行。这里s是字符串用一个反射把字符串变成方法。

    第三个是输出123，并且eat...  这里类可以直接调用自己的方法。不一定非得是实例对象。

    第四个

    第一个调用本身的__str__方法返回名字。

    alex

    第二个却是将alex这个对象变成字符串。
    <__main__.Person object at 0x0000016951BDD5F8>

    这里补充7个注意点：

    注意点1：
        from django.utils.safestring import mark_safe

        这样的话，django就不会去给你转义了。
        return mark_safe("<a href="">编辑</a>")

    注意点2：
        在modelStark中:
        self.model:用户当前访问的表

    注意点3：
        class Person(object):
            def __init__(self,name):
                self.name=name
        alex=Person("alex")
        s="name"
        print(getattr(alex,s))
        通过反射可以取值，而直接.一个字符串会报错。
        
    注意点4：
        callable(field)  #可以判断传入的是否是函数，是True,否则返回False

    注意点5：
        class Person(object):
            def __init__(self,name):
                self.name=name

            def __str__(self):
                return self.name
        
        alex=Person("alex")
        print(alex)   #"alex"

        alex.__str__() == str(alex)
    注意点6：
        #可以通过这些获取到表名，项目名，以及每个字段的值。
        model_name=Book._meta.model_name
        app_label=Book._meta.app_label
        title=Book._meta.get_field("title")
        
        title.max_length   #32
    注意点7：
        def foo():
            return
        print(foo.__name__)  #foo

     2、mark_safe模块：将html标签安全传输

    from django.utils.safestring import mark_safe

#这样的话，django就不会去给你转义了。
return mark_safe("<a href="">编辑</a>")

     

    3、构造表单数据

     

    4、反向解析

    https://www.cnblogs.com/yuanchenqi/articles/7629939.html

        反向解析：
                    def get_urls2(self):
                        temp=[]
                        model_name = self.model._meta.model_name
                        app_label = self.model._meta.app_label
                        temp.append(url(r"^add/",self.add_view,name="%s_%s_add"%(app_label,model_name)))
                        temp.append(url(r"^$", self.list_view,name="%s_%s_list"%(app_label,model_name)))
                        temp.append(url(r"^(d+)/delete/", self.delete_view,name="%s_%s_delete"%(app_label,model_name)))
                        temp.append(url(r"^(d+)/change/", self.change_view,name="%s_%s_change"%(app_label,model_name)))
                        return temp

     

     

    里面用到的_url利用了URL的反向解析。
            直接封装成下面的4个方向解析方法，得到最终的URL即可，到时候直接调用这些函数返回URL。
                def get_change_url(self, obj):
                    model_name = self.model._meta.model_name
                    app_label = self.model._meta.app_label
                    _url = reverse("%s_%s_change" % (app_label, model_name), args=(obj.pk,))
                    return _url

                def get_delete_url(self, obj):
                    model_name = self.model._meta.model_name
                    app_label = self.model._meta.app_label
                    _url = reverse("%s_%s_delete" % (app_label, model_name), args=(obj.pk,))
                    return _url


                def get_add_url(self):
                    model_name = self.model._meta.model_name
                    app_label = self.model._meta.app_label
                    _url = reverse("%s_%s_add" % (app_label, model_name))
                    return _url

                def get_list_url(self):
                    model_name = self.model._meta.model_name
                    app_label = self.model._meta.app_label
                    _url = reverse("%s_%s_list" % (app_label, model_name))
                    return _url

    5、编辑按钮构造

     

    # -*- coding: utf-8 -*-
# @Time    : 2018/08/17 0017 14:52
# @Author  : Venicid

from stark.service import stark
from .models import *

from django.utils.safestring import mark_safe
from django.urls import reverse

class AuthorConfig(stark.ModelStark):

    def edit(self,obj):
        # return mark_safe("<a>编辑</a>")

        # 方案1：固定url
        # return mark_safe("<a href=/stark/app01/userinfo/%s/change>编辑</a>")

        # 方案2：拼接url
        # return mark_safe("<a href='%s/change'>编辑</a>")

        # 方案3：反向解析
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label
        _url = reverse("%s_%s_change"%(app_label,model_name),args=(obj.pk,))
        print("_url",_url)
        return mark_safe("<a href='%s'>编辑</a>"%_url)

    list_display = ['pk', 'name', 'age', edit]


stark.site.register(Book)
stark.site.register(Publish)
stark.site.register(Author,AuthorConfig)
stark.site.register(AuthorDetail)

print(stark.site._registry)

"""
{<class 'app01.models.Book'>: <stark.service.stark.ModelStark object at 0x0000003AA7439630>,
<class 'app01.models.Publish'>: <stark.service.stark.ModelStark object at 0x0000003AA7439668>,
<class 'app01.models.Author'>: <stark.service.stark.ModelStark object at 0x0000003AA74396A0>,
<class 'app01.models.AuthorDetail'>: <stark.service.stark.ModelStark object at 0x0000003AA7439940>}
"""
    starkadmin.py
    # -*- coding: utf-8 -*-
# @Time    : 2018/08/17 0017 14:46
# @Author  : Venicid
from django.conf.urls import url
from django.shortcuts import HttpResponse,render


class ModelStark(object):
    list_display = ["__str__"]  # 子类中没有，直接用父类自己的

    def __init__(self,model, site):
        self.model = model
        self.site = site

    def list_view(self, request):
        print(self.model)  # <class 'app01.models.Book'>  用户访问的模型表
        print('list_display',self.list_display)

        # 获取data_list
        data_list = self.model.objects.all()        # [obj1,obj2,...]
        new_data_list = []
        for obj in data_list:       # Book表模型，Author表模型
            temp = []
            for filed in self.list_display:     # ['name','age']
                if callable(filed):                 # edit()  可调用的
                    val = filed(self,obj)           # 直接调用edit()函数
                else:
                    val = getattr(obj,filed)       # 反射  obj是实例对象，name是方法
                temp.append(val)

            new_data_list.append(temp)

        print('new_data_list',new_data_list)        # 构造数据  [['jack', 44], ['mark', 33]]

        return render(request,'list_view.html', locals())


    def add(self, request):
        return HttpResponse('add')

    def delete(self, request, id):
        return HttpResponse('delete')

    def change(self, request, id):
        return HttpResponse('change')

    def get_urls2(self):
        """构造 add/delete/change"""
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        temp = []
        temp.append(url(r'^$', self.list_view, name='%s_%s_list'%(app_label,model_name)))
        temp.append(url(r'^add/', self.add, name='%s_%s_add'%(app_label,model_name)))
        temp.append(url(r'^(d+)/delete/', self.delete, name='%s_%s_delete'%(app_label,model_name)))
        temp.append(url(r'^(d+)/change/', self.change, name='%s_%s_change'%(app_label,model_name)))

        return temp

    @property
    def urls2(self):

        return self.get_urls2(), None, None


class StarkSite(object):
    """site单例类"""
    def __init__(self):
        self._registry = {}

    def register(self,model, stark_class=None):
        """注册"""
        if not stark_class:
            stark_class = ModelStark

        self._registry[model] = stark_class(model,self)

    def get_urls(self):
        """构造一层urls app01/book"""
        temp = []
        for model, stark_class_obj in self._registry.items():
            print(model, 'stark_clas_obj', stark_class_obj)  # 不同的model模型表
            """
             <class 'app01.models.UserInfo'> ----> <app01.starkadmin.UserConfig object at 0x00000072DDB65198>
             <class 'app01.models.Book'> ----> <stark.service.stark.ModelStark object at 0x00000072DDB65240>
             """

            app_label = model._meta.app_label     # app01
            model_name = model._meta.model_name   # book
            # temp.append(url(r'^%s/%s'%(app_label, model_name),([],None,None)))
            temp.append(url(r'^%s/%s/'%(app_label, model_name),stark_class_obj.urls2))
            """
               path('app01/userinfo/',UserConfig(Userinfo,site).urls2),
               path('app01/book/',ModelStark(Book,site).urls2),
            """


        return temp

    @property
    def urls(self):

        # return [],None,None
        return self.get_urls(),None,None

site = StarkSite()   # 单例对象
    stark/service/stark.py 

    2、构造表头，删除，checkbox，links编辑

    1、必备小知识

     

     2、list_display显示表头

     

    3、verbose_name显示中文

        # 构建表头数据
    def get_header(self):

        header_list=[]
        for field in self.config.new_list_display():
            if callable(field):
                val=field(self,header=True)
                header_list.append(val)
            else:
                if field =="__str__":
                    header_list.append(self.config.model._meta.model_name.upper())
                else:
                    val=self.config.model._meta.get_field(field).verbose_name
                    header_list.append(val)
        return header_list

    # 构建表单数据
    def get_body(self):
        new_data_list = []
        for obj in self.page_Data:
            temp = []
            for field in self.config.new_list_display():

                if callable(field):
                    val = field(self.config, obj)
                else:
                    try:
                        val = getattr(obj, field)
                        if field in self.config.list_display_links:
                            _url = self.config.get_change_url(obj)
                            val = mark_safe("<a href='%s'>%s</a>" % (_url, val))
                    except Exception as e:
                        val = getattr(obj, field)
                temp.append(val)

            new_data_list.append(temp)
        return new_data_list

    4、list_display_links编辑link构造

     

    3、代码+总结

    1、总结

    完成
    （list_display）
    （list_display_links）

    1.根据str，拿字段对象，取中文
        val = self.model._meta.get_field(field).verbose_name

    2.模型名称，app名称
        model_name = self.model._meta.model_name
    app_lable = self.model._meta.app_label
    3.判断是否可调用
        if callable(field):
        val = field(self, header = True)
            
    4.字符串找对象得属性，反射
        val = getattr(data, field)

    5.返回标签
       return mark_safe("<input id='choice' type='checkbox'>")
    6.插入数组[]
        temp.append(ModelStark.checkbox)
    temp.extend(self.list_display)

    7.反向解析，含正则
        _url = reverse("%s_%s_delete" % (app_label, model_name), args=(obj.pk,))
    _url = reverse("%s_%s_add" % (app_label, model_name))

    8.复选框，全选/全不选
        $('#choice').click(function () {
        if($(this).prop('checked')){
            $('.choice_item').prop('checked',true)
        }else{
            $('.choice_item').prop('checked',false)
        }
    })

    2、stark.py

     
    from stark.service import stark
from .models import *


class AuthorConfig(stark.ModelStark):

    list_display = ['nid', 'name', 'age']
    list_display_links = ['name','age']



stark.site.register(Book)
stark.site.register(Publish)
stark.site.register(Author,AuthorConfig)
stark.site.register(AuthorDetail)

print(stark.site._registry)
     

    3、stark/server/stark.py

    from django.conf.urls import url
from django.shortcuts import HttpResponse,render

from django.utils.safestring import mark_safe
from django.urls import reverse


class ModelStark(object):
    list_display = ["__str__"]  # 子类中没有，直接用父类自己的
    list_display_links = []

    def __init__(self,model, site):
        self.model = model
        self.site = site

    # 复选框，编辑，删除
    def checkbox(self,obj=None, header=False):
        if header:
            return mark_safe("<input id='choice' type='checkbox'>")
        return mark_safe("<input class='choice_item' type='checkbox'>")


    def edit(self,obj=None, header=False):
        if header:
            return "操作"
        # 方案1：固定url
        # return mark_safe("<a href=/stark/app01/userinfo/%s/change>编辑</a>")
        # 方案2：拼接url
        # return mark_safe("<a href='%s/change'>编辑</a>")

        # 方案3：反向解析
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label
        _url = reverse("%s_%s_change"%(app_label,model_name),args=(obj.pk,))
        # print("_url",_url)
        return mark_safe("<a href='%s'>编辑</a>"%_url)


    def deletes(self,obj=None, header=False):
        if header:
            return "操作"
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label
        _url = reverse("%s_%s_delete"%(app_label,model_name),args=(obj.pk,))
        return mark_safe("<a href='%s'>删除</a>"%_url)


    def new_list_play(self):
        """构建 ['checkbox','pk', 'name', 'age', edit,'delete']"""
        temp = []
        temp.append(ModelStark.checkbox)
        temp.extend(self.list_display)
        if not self.list_display_links:
            temp.append(ModelStark.edit)
        temp.append(ModelStark.deletes)
        return temp

    def list_view(self, request):
        print(self.model)  # <class 'app01.models.Book'>  用户访问的模型表

        # 构建表头
        header_list = []  # # header_list = ['选择'，'pk',...'操作','操作']
        for field in self.new_list_play():
            if callable(field):
                # header_list.append(field.__name__)
                val = field(self,header=True)
                header_list.append(val)
            else:
                if field == "__str__":
                    header_list.append(self.model._meta.model_name.upper())
                else:
                    val = self.model._meta.get_field(field).verbose_name    # 中文名称
                    header_list.append(val)

        # 构建表单
        data_list = self.model.objects.all()        # [obj1,obj2,...]
        new_data_list = []
        for obj in data_list:                   # Book表模型，Author表模型
            temp = []
            for field in self.new_list_play():     # ['name','age']
                if callable(field):                 # edit()  可调用的
                    val = field(self,obj)           # 直接调用edit()函数
                    print('val--------->',val)
                else:
                    val = getattr(obj,field)       # 反射  obj是实例对象，name是方法

                    # list_display_links 按钮
                    if field in self.list_display_links:
                        model_name = self.model._meta.model_name
                        app_label = self.model._meta.app_label
                        _url = reverse("%s_%s_change" % (app_label, model_name), args=(obj.pk,))
                        # print(_url)
                        val = mark_safe("<a href='%s'>%s</a>"%(_url,field))

                temp.append(val)

            new_data_list.append(temp)

        print('new_data_list',new_data_list)        # 构造数据  [['jack', 44], ['mark', 33]]

        return render(request,'list_view.html', locals())


    def add(self, request):
        return HttpResponse('add')

    def delete(self, request, id):
        return HttpResponse('delete')

    def change(self, request, id):
        return HttpResponse('change')

    def get_urls2(self):
        """构造 add/delete/change"""
        model_name = self.model._meta.model_name
        app_label = self.model._meta.app_label

        temp = []
        temp.append(url(r'^$', self.list_view, name='%s_%s_list'%(app_label,model_name)))
        temp.append(url(r'^add/', self.add, name='%s_%s_add'%(app_label,model_name)))
        temp.append(url(r'^(d+)/delete/', self.delete, name='%s_%s_delete'%(app_label,model_name)))
        temp.append(url(r'^(d+)/change/', self.change, name='%s_%s_change'%(app_label,model_name)))

        return temp

    @property
    def urls2(self):

        return self.get_urls2(), None, None


class StarkSite(object):
    """site单例类"""
    def __init__(self):
        self._registry = {}

    def register(self,model, stark_class=None):
        """注册"""
        if not stark_class:
            stark_class = ModelStark

        self._registry[model] = stark_class(model,self)

    def get_urls(self):
        """构造一层urls app01/book"""
        temp = []
        for model, stark_class_obj in self._registry.items():
            print(model, 'stark_clas_obj', stark_class_obj)  # 不同的model模型表
            """
             <class 'app01.models.UserInfo'> ----> <app01.starkadmin.UserConfig object at 0x00000072DDB65198>
             <class 'app01.models.Book'> ----> <stark.service.stark.ModelStark object at 0x00000072DDB65240>
             """

            app_label = model._meta.app_label     # app01
            model_name = model._meta.model_name   # book
            # temp.append(url(r'^%s/%s'%(app_label, model_name),([],None,None)))
            temp.append(url(r'^%s/%s/'%(app_label, model_name),stark_class_obj.urls2))
            """
               path('app01/userinfo/',UserConfig(Userinfo,site).urls2),
               path('app01/book/',ModelStark(Book,site).urls2),
            """


        return temp

    @property
    def urls(self):

        # return [],None,None
        return self.get_urls(),None,None

site = StarkSite()   # 单例对象
     

    4、模板层

     
    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="/static/bootstrap-3.3.7/css/bootstrap.css">
    <script src="/static/jQuery/jquery-3.2.1.min.js"></script>
</head>
<body>
<h3>list页面</h3>
<div class="container">
    <div class="row">
        <div class="col-md-9 col-lg-offset-1">
            <table class="table table-bordered table-striped">
                <tr>
                    {% for header in header_list %}
                        <th>{{ header }}</th>
                    {% endfor %}
                </tr>

                {% for data in new_data_list %}
                    <tr>
                        {% for item in data %}
                            <td>{{ item }}</td>
                        {% endfor %}

                    </tr>
                {% endfor %}
            </table>
        </div>
    </div>
</div>

<script type="text/javascript">
        $('#choice').click(function () {
            if ($(this).prop('checked')){   //对象自身属性中是否具有指定的属性
                $('.choice_item').prop("checked",true)
            }else{
                $('.choice_item').prop("checked",false)
            }
        })
</script>
</body>
</html>
     

     最后附上核心代码注释：

        最难的查看页面：
            def list_view(self,request):
                data_list=self.model.objects.all()  #首先肯定是取到所有的对象
                # 1.构建表头数据
                header_list=[]   
                for field in self.new_list_display():
                    if callable(field):
                        val=field(self,header=True)   #这里是表头返回的"操作",和按个checkbox
                        header_list.append(val)    
                    else:                             #如果是str,返回表名的大写字母
                        if field =="__str__":
                            header_list.append(self.model._meta.model_name.upper())
                        else:                         #这里表示获取到每个字段的verbose_name（可中文）
                            val=self.model._meta.get_field(field).verbose_name
                            header_list.append(val)



                # 2.构建表单数据
                new_data_list=[]
                for obj in data_list:   #1.取到每一个数据对象
                    temp=[]
                    for field in self.new_list_display():  #2.从list_display取到字段
                        if callable(field):
                            val=field(self,obj)          #如果是可调用的话，那么这个数据就是a标签或者checkbox
                        else:
                            val=getattr(obj,field)       
                            # 3.如果是每个数据的话，利用反射，取到对应的值，相当于(obj.field)。
                            if field in self.list_display_links:  #当然这里判定一下是否设置的点击编辑的选项！
                                _url = self.get_change_url(obj)
                                val=mark_safe("<a href='%s'>%s</a>"%(_url,val)) #如果给某个字段设置了，改为a标签
                        temp.append(val)

                    new_data_list.append(temp)
                #构建一个查看URL
                add_url=self.get_add_url()    #在添加数据的时候需要在后面追加add,利用URL反向解析，不要写死。
                return render(request,"list_view.html",locals())
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  • 原文地址：https://www.cnblogs.com/geogre123/p/9790138.html
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