stark——分页、search、actions

一、分页

1、引入自定义分页组件

　　在/stark目录下创建utils工具包目录，复制page.py到该目录下，文件中有之前自定义的分页组件。

class Pagination(object):
    def __init__(self, current_page, all_count, base_url, params, per_page_num=8, pager_count=11, ):
        """
        封装分页相关数据
        :param current_page: 当前页
        :param all_count:    数据库中的数据总条数
        :param per_page_num: 每页显示的数据条数
        :param base_url: 分页中显示的URL前缀
        :param pager_count:  最多显示的页码个数
        """

        try:
            current_page = int(current_page)
        except Exception as e:
            current_page = 1

        if current_page < 1:
            current_page = 1

        self.current_page = current_page

        self.all_count = all_count
        self.per_page_num = per_page_num

        self.base_url = base_url

        # 总页码
        all_pager, tmp = divmod(all_count, per_page_num)
        if tmp:
            all_pager += 1
        self.all_pager = all_pager

        self.pager_count = pager_count  # 最多显示页码数
        self.pager_count_half = int((pager_count - 1) / 2)

        import copy
        params = copy.deepcopy(params)
        params._mutable = True
        self.params = params  # self.params : {"page":77,"title":"python","nid":1}


    @property
    def start(self):
        return (self.current_page - 1) * self.per_page_num


    @property
    def end(self):
        return self.current_page * self.per_page_num


    def page_html(self):
        # 如果总页码 < 11个：
        if self.all_pager <= self.pager_count:
            pager_start = 1
            pager_end = self.all_pager + 1
        # 总页码  > 11
        else:
            # 当前页如果<=页面上最多显示(11-1)/2个页码
            if self.current_page <= self.pager_count_half:
                pager_start = 1
                pager_end = self.pager_count + 1

            # 当前页大于5
            else:
                # 页码翻到最后
                if (self.current_page + self.pager_count_half) > self.all_pager:
                    pager_start = self.all_pager - self.pager_count + 1
                    pager_end = self.all_pager + 1

                else:
                    pager_start = self.current_page - self.pager_count_half
                    pager_end = self.current_page + self.pager_count_half + 1

        page_html_list = []
        self.params["page"] = 1
        first_page = '<li><a href="%s?%s">首页</a></li>' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(first_page)

        if self.current_page <= 1:
            prev_page = '<li class="disabled"><a href="#">上一页</a></li>'
        else:
            self.params["page"] = self.current_page - 1
            prev_page = '<li><a href="%s?%s">上一页</a></li>' % (self.base_url, self.params.urlencode(),)

        page_html_list.append(prev_page)

        for i in range(pager_start, pager_end):
            #  self.params  : {"page":77,"title":"python","nid":1}

            self.params["page"] = i  # {"page":72,"title":"python","nid":1}
            if i == self.current_page:
                temp = '<li class="active"><a href="%s?%s">%s</a></li>' % (self.base_url, self.params.urlencode(), i,)
            else:
                temp = '<li><a href="%s?%s">%s</a></li>' % (self.base_url, self.params.urlencode(), i,)
            page_html_list.append(temp)

        if self.current_page >= self.all_pager:
            next_page = '<li class="disabled"><a href="#">下一页</a></li>'
        else:
            self.params["page"] = self.current_page + 1
            next_page = '<li><a href="%s?%s">下一页</a></li>' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(next_page)

        self.params["page"] = self.all_pager
        last_page = '<li><a href="%s?%s">尾页</a></li>' % (self.base_url, self.params.urlencode(),)
        page_html_list.append(last_page)

        return ''.join(page_html_list)

2、整合展示数据showlist类实现代码解耦

　　将list_view函数中的构建表头代码挪移到ShowList类的get_header函数下，将将list_view函数中的构建表单代码挪移到ShowList类的get_body函数下。

/stark/serivce/stark.py:

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list):
        self.config = config   # 接收传递过来的配置类对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象

    def get_header(self):
        """构建表头"""
        header_list = []
        print("header", self.config.new_list_display())  # [checkbox ,"__str__", edit ,deletes]

        for field in self.config.new_list_display():

            if callable(field):
                # 如果是函数
                val = field(self, header=True)
                header_list.append(val)

            else:
                # 如果是字符串
                if field == "__str__":
                    header_list.append(self.config.model._meta.model_name.upper())  # 当前模型表名
                else:
                    # 如果不是"__str__"
                    # header_list.append(field)
                    val = self.config.model._meta.get_field(field).verbose_name
                    header_list.append(val)
        return header_list

    def get_body(self):
        """构建表单数据"""
        new_data_list = []

        for obj in self.data_list:
            temp = []
            for field in self.config.new_list_display():  # ["__str__", ]   ["pk","name","age",edit]
                if callable(field):
                    val = field(self.config, obj)
                else:
                    val = getattr(obj, field)
                    if field in self.config.list_display_links:
                        # _url = reverse("%s_%s_change" % (app_label, model_name), args=(obj.pk,))
                        _url = self.config.get_change_url(obj)

                        val = mark_safe("<a href='%s'>%s</a>" % (_url, val))
                temp.append(val)
            new_data_list.append(temp)
        return new_data_list


class ModelStark(object):
    """代码省略"""
    def list_view(self, request):
        data_list = self.model.objects.all()  # 拿到对应表所有的对象
        show_list = ShowList(self, data_list)  # 传入self，即将当前ModelStark的实例对象传给ShowList
        header_list = show_list.get_header()
        new_data_list = show_list.get_body()
        # 构建一个查看url
        add_url = self.get_add_url()
        return render(request, "list_view.html", locals())

（1）在list_view函数下执行ShowList实例化，在实例化时传入：

　　self:即当前ModelStark的实例对象；data_list：对应表所有的对象。

（2）在新的类ShowList通过__init__方法来接收者两个参数：

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list):
        self.config = config   # 接收传递过来的配置类对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象

（3）给模板传递正确的数据

　　由于模板接收的数据是header_list和new_data_list。需要给get_header和get_body函数添加返回值。

　　同时在list_view中构建header_list和new_data_list变量：

show_list = ShowList(self, data_list)  # 传入self，即将当前ModelStark的实例对象传给ShowList
header_list = show_list.get_header()
new_data_list = show_list.get_body()

3、给查看页码添加分页

（1）service/stark.py:

from stark.utils.page import Pagination

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list, request):
        self.config = config   # 接收传递过来的配置类对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象
        self.request = request
        # 分页
        data_count = self.data_list.count()
        current_page = int(self.request.GET.get("page", 1))  # 默认是第一页
        base_path = self.request.path

        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=1, pager_count=11,)
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]
    """代码省略"""


class ModelStark(object):
    """代码省略"""
    def list_view(self, request):
        data_list = self.model.objects.all()  # 拿到对应表所有的对象
        show_list = ShowList(self, data_list, request)  # 传入self，即将当前ModelStark的实例对象传给ShowList
        header_list = show_list.get_header()
        new_data_list = show_list.get_body()
        # 构建一个查看url
        add_url = self.get_add_url()
        print("add_url", add_url)
        return render(request, "list_view.html", locals())

（1）list_view函数中创建ShowList示例时多传入了一个request参数。ShowList拿到request后获取GET请求数据和请求路径：

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list, request):
        self.config = config   # 接收传递过来的配置类对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象
        self.request = request   #  <WSGIRequest: GET '/stark/app01/book/?page=2'>
        # 分页
        data_count = self.data_list.count()
        current_page = int(self.request.GET.get("page", 1))  # 默认是第一页
        base_path = self.request.path   # /stark/app01/book/

（2）实例化pagination，获取页码数据

　　引入自定义分页组件，将参数传入完成pagination实例化。获取当前页码数据：

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list, request):
        '''代码省略'''
        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=1, pager_count=11,)
        print("data_list", self.data_list)   # data_list <QuerySet [<Book: python葵花宝典>, <Book: go>, <Book: java>]>
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]
        print("page_data", self.page_data)   # page_data <QuerySet [<Book: python葵花宝典>]>

        '''代码省略'''
    def get_body(self):
        """构建表单数据"""
        new_data_list = []
        # for obj in self.data_list:
        for obj in self.page_data:   # 当前页面的数据
            '''代码省略'''

（3）list_view.html添加分页

<body>
<h4>数据列表</h4>
<div class="container">
    <div class="row">
        <div class="col-md-9"....代码省略..>
        <nav>
            <ul class="pagination">
                {{ show_list.pagination.page_html|safe }}
            </ul>
        </nav>
    </div>
</div>

（4）显示效果如下：

　　

二、search查询

1、在查看页面添加搜索框

<h4>数据列表</h4>
<div class="container">
    <div class="row">
        <div class="col-md-9">
            <a href="{{ add_url }}" class="btn btn-primary">添加数据</a>
            <form action="" class="pull-right">
                <input type="text" name="q">
                <button>搜索</button>
            </form>
            <table class="table table-bordered table-striped".....>
        </div>
        <nav....>
    </div>
</div>

　　输入查询内容后，点击搜索按钮，发送的get请求如下所示：

　　

2、查询匹配

# -*- coding:utf-8 -*-
__author__ = 'Qiushi Huang'


from django.conf.urls import url
from django.shortcuts import HttpResponse, render, redirect
from django.utils.safestring import mark_safe
from django.urls import reverse
from stark.utils.page import Pagination


class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list, request):
        self.config = config   # 接收传递过来的配置类对象 ModelStark的实例对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象
        self.request = request   #  <WSGIRequest: GET '/stark/app01/book/?page=2'>
        # 分页
        data_count = self.data_list.count()
        current_page = int(self.request.GET.get("page", 1))  # 默认是第一页
        base_path = self.request.path   # /stark/app01/book/

        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=1, pager_count=11,)
        print("data_list", self.data_list)   # data_list <QuerySet [<Book: python葵花宝典>, <Book: go>, <Book: java>]>
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]
        print("page_data", self.page_data)   # page_data <QuerySet [<Book: python葵花宝典>]>

    def get_header(self):
        """构建表头"""
        header_list = []
        print("header", self.config.new_list_display())  # [checkbox ,"__str__", edit ,deletes]

        for field in self.config.new_list_display():

            if callable(field):
                # 如果是函数
                val = field(self, header=True)
                header_list.append(val)

            else:
                # 如果是字符串
                if field == "__str__":
                    header_list.append(self.config.model._meta.model_name.upper())  # 当前模型表名
                else:
                    # 如果不是"__str__"
                    # header_list.append(field)
                    val = self.config.model._meta.get_field(field).verbose_name
                    header_list.append(val)
        return header_list

    def get_body(self):
        """构建表单数据"""
        new_data_list = []
        # for obj in self.data_list:
        for obj in self.page_data:   # 当前页面的数据
            temp = []

            for field in self.config.new_list_display():  # ["__str__", ]   ["pk","name","age",edit]

                if callable(field):
                    val = field(self.config, obj)
                else:
                    val = getattr(obj, field)
                    if field in self.config.list_display_links:
                        # _url = reverse("%s_%s_change" % (app_label, model_name), args=(obj.pk,))
                        _url = self.config.get_change_url(obj)

                        val = mark_safe("<a href='%s'>%s</a>" % (_url, val))

                temp.append(val)

            new_data_list.append(temp)
        return new_data_list


class ModelStark(object):
    """默认类，定制配置类"""
    list_display = ["__str__",]
    list_display_links = []
    modelform_class = []
    search_fields = []

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

    # 删除、编辑，复选框
    def edit(self, obj=None, header=False):
        """编辑"""
        if header:
            # 如果是表头显示操作
            return "操作"

        _url = self.get_change_url(obj)
        return mark_safe("<a href='%s'>编辑</a>" % _url)

    def deletes(self, obj=None, header=False):
        """删除"""
        if header:
            # 如果是表头显示操作
            return "操作"

        _url = self.get_delete_url(obj)
        # return mark_safe("<a href='%s/change'>删除</a>" % obj.pk)
        return mark_safe("<a href='%s/'>删除</a>" % _url)

    def checkbox(self, obj=None, header=False):
        """复选框"""
        if header:
            # 如果是表头显示操作
            return mark_safe("<input id='choice' type='checkbox'>")

        return mark_safe("<input class='choice_item' type='checkbox'>")

    def get_modelform_class(self):
        """用来获取modelform类"""
        if not self.modelform_class:
            # 如果没有值
            from django.forms import ModelForm
            from django.forms import widgets as wid

            class ModelFormDemo(ModelForm):
                class Meta:
                    model = self.model
                    fields = "__all__"

            return ModelFormDemo
        else:
            # 如果有值说明在用户已经自己定制过了,直接取值
            return self.modelform_class

    def add_view(self, request):
        ModelFormDemo = self.get_modelform_class()
        if request.method == "POST":
            form = ModelFormDemo(request.POST)
            if form.is_valid():  # 校验字段全部合格
                form.save()
                return redirect(self.get_list_url())  # 跳转到当前访问表的查看页面

            # （精髓）校验有错误返回页面，且包含了错误信息
            return render(request, "add_view.html", locals())

        form = ModelFormDemo()  # 实例化
        return render(request, "add_view.html", locals())

    def delete_view(self, request, id):
        url = self.get_list_url()
        if request.method == "POST":
            self.model.objects.filter(pk=id).delete()
            return redirect(url)

        # self.model.objects.filter(pk=id).delete()
        return render(request, "delete_view.html", locals())

    def change_view(self, request, id):
        """编辑视图"""
        ModelFormDemo = self.get_modelform_class()
        # 编辑对象
        edit_obj = self.model.objects.filter(pk=id).first()

        if request.method == "POST":
            form = ModelFormDemo(request.POST, instance=edit_obj)  # instance就是给这个记录更改为最新的数据
            if form.is_valid():  # 校验字段全部合格
                form.save()
                return redirect(self.get_list_url())  # 跳转到当前访问表的查看页面

            # （精髓）校验有错误返回页面，且包含了错误信息
            return render(request, "add_view.html", locals())

        form = ModelFormDemo(instance=edit_obj)   # 用instance放入编辑对象就有了编辑数据

        return render(request, "change_view.html", locals())

    def new_list_display(self):
        """返回新的列表"""
        temp = []
        temp.append(ModelStark.checkbox)  # 在列表中放一个checkbox名字
        temp.extend(self.list_display)  # 扩展进一个列表["pk","name","age"]

        if not self.list_display_links:
            # 如果没有值
            temp.append(ModelStark.edit)

        # temp.append(ModelStark.edit)    # edit函数名
        temp.append(ModelStark.deletes)   # deletes函数名

        return temp   # 返回新的列表

    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

    def get_search_condition(self, request):
        key_word = request.GET.get("q", "")   # 取不到q则直接取空
        self.key_word = key_word
        from django.db.models import Q
        search_connection = Q()
        if key_word:  # 判断key_word是否为空
            search_connection.connector = "or"  # 查询条件设置为或
            for search_field in self.search_fields:  # self.search_fields   # ['title', "price"]
                search_connection.children.append((search_field + "__contains", key_word))
        return search_connection

    def list_view(self, request):
        # 获取search的Q对象
        search_condition = self.get_search_condition(request)
        # 筛选当前表获取的数据
        data_list = self.model.objects.all().filter(search_condition)

        # 获取showlist展示页面
        show_list = ShowList(self, data_list, request)

        header_list = show_list.get_header()
        new_data_list = show_list.get_body()

        # 构建一个查看url
        add_url = self.get_add_url()
        print("add_url", add_url)
        return render(request, "list_view.html", locals())

    def get_urls_2(self):
        temp = []

        # 用name取别名app名+model名+操作名可以保证别名不会重复
        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"^(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)))
        temp.append(url(r"^$", self.list_view, name="%s_%s_list" % (app_label, model_name)))
        return temp

    @property
    def urls_2(self):
        return self.get_urls_2(), None, None  # [], None, None


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

    def register(self, model, stark_class=None, **options):
        """注册"""
        if not stark_class:
            # 如果注册的时候没有自定义配置类,执行
            stark_class = ModelStark   # 配置类

        # 将配置类对象加到_registry字典中，键为模型类
        self._registry[model] = stark_class(model, self)   # _registry={'model':admin_class(model)}

    def get_urls(self):
        """构造一层url"""
        temp = []
        for model, stark_class_obj in self._registry.items():
            # model:一个模型表
            # stark_class_obj:当前模型表相应的配置类对象

            model_name = model._meta.model_name
            app_label = model._meta.app_label

            # 分发增删改查
            temp.append(url(r"^%s/%s/" % (app_label, model_name), stark_class_obj.urls_2))
            """
               path('app01/userinfo/',UserConfig(Userinfo,site).urls2),
               path('app01/book/',ModelStark(Book,site).urls2),
            """

        return temp

    @property
    def urls(self):
        return self.get_urls(), None, None


site = StarkSite()    # 单例对象

（1）Q查询

　　filter() 等方法中的关键字参数查询都是一起进行“AND” 的。 如果需要执行更复杂的查询（例如OR 语句）可以使用Q对象。可以组合& 和|  操作符以及使用括号进行分组来编写任意复杂的Q 对象。同时，Q 对象可以使用~ 操作符取反，这允许组合正常的查询和取反(NOT) 查询。

　　在这里由于需要循环self.search_fields，且拿到的都是一个个字符串。所以需要使用Q对象实例化的用法：

from .models import *

def test(request):
    from django.db.models import Q
    # Q查询普通写法：
    ret = Book.objects.all().filter(Q(title="go")|Q(price=103))
    print("ret", ret)    # ret <QuerySet [<Book: go>]>
    # Q查询特殊用法：
    q = Q()
    q.connectiion = "or"
    q.children.append(("title", "go"))
    q.children.append(("price", 103))
    print("q", q)   # q (AND: ('title', 'yuan'), ('price', 123))
    return HttpResponse(ret, q) 

　　Q查询特殊用法应用：

class ModelStark(object):
    def list_view(self, request):
        key_word = request.GET.get("q")

        from django.db.models import Q
        search_connection = Q()
        search_connection.connector = "or"   # 查询条件设置为或
        for search_field in self.search_fields:   # self.search_fields   # ['title', "price"]
            search_connection.children.append((search_field, key_word))

        data_list = self.model.objects.all().filter(search_connection)

        # 获取showlist展示页面
        show_list = ShowList(self, data_list, request)
        header_list = show_list.get_header()
        new_data_list = show_list.get_body()
        # 构建一个查看url
        add_url = self.get_add_url()
        print("add_url", add_url)
        return render(request, "list_view.html", locals())

（2）基于双下划线的模糊查询

# __startwith: 以...开头
ret = Book.objects.filter(title__startswith="py")
print(ret)   # <QuerySet [<Book: python红宝书>]>
 
# __contains:带有...字符
ret = Book.objects.filter(title__contains="h")
print(ret)   # <QuerySet [<Book: python红宝书>, <Book: php宝典>]>

　　模糊查询应用：search_field+"__contains"

class ModelStark(object):
    def list_view(self, request):
        key_word = request.GET.get("q")
        from django.db.models import Q
        search_connection = Q()
        if key_word:   # 判断key_word是否为空
            search_connection.connector = "or"   # 查询条件设置为或
            for search_field in self.search_fields:   # self.search_fields   # ['title', "price"]
                search_connection.children.append((search_field + "__contains", key_word))

        # 获取当前表所有数据
        data_list = self.model.objects.all().filter(search_connection)

　　查询效果：

　　

（3）在实例方法中封装模糊查询

class ModelStark(object):
    def get_search_condition(self, request):
        key_word = request.GET.get("q")
        from django.db.models import Q
        search_connection = Q()
        if key_word:  # 判断key_word是否为空
            search_connection.connector = "or"  # 查询条件设置为或
            for search_field in self.search_fields:  # self.search_fields   # ['title', "price"]
                search_connection.children.append((search_field + "__contains", key_word))
        return search_connection

    def list_view(self, request):
        # 获取search的Q对象
        search_condition = self.get_search_condition(request)
        # 筛选当前表获取的数据
        data_list = self.model.objects.all().filter(search_condition)

        # 获取showlist展示页面
        show_list = ShowList(self, data_list, request)

        header_list = show_list.get_header()
        new_data_list = show_list.get_body()

        # 构建一个查看url
        add_url = self.get_add_url()
        print("add_url", add_url)
        return render(request, "list_view.html", locals())

（4）查询提交后，查询框依旧显示搜索的字段

　　提交查询后相当于获取了一个新的页面，要显示搜索的字段，必须获取该字段并传到新页面中。

<form action="" class="pull-right">
    <input type="text" name="q" value="{{ show_list.config.key_word }}">
    <button>搜索</button>
</form>

 　　这里需要注意show_list这个变量，在ModelStark类中list_view实例方法中，实例化ShowList类时，传递了self，这个self是ModelStark的实例对象，而这个实例对象由ShowList用self.config接收。因此show_list是ShowList的实例对象，具备config属性，show_list.config就是ModelStark的实例对象，具备key_word实例属性。

　　显示效果：

　　

　　如果没有输入任何内容直接搜索，搜索框会显示一个None，如果要只显示为空，需要在request.GET.get("q")做如下调整：

class ModelStark(object):
    def get_search_condition(self, request):
        key_word = request.GET.get("q", "")   # 取不到q则直接取空
        self.key_word = key_word
        from django.db.models import Q
        search_connection = Q()
        if key_word:  # 判断key_word是否为空
            search_connection.connector = "or"  # 查询条件设置为或
            for search_field in self.search_fields:  # self.search_fields   # ['title', "price"]
                search_connection.children.append((search_field + "__contains", key_word))
        return search_connection

3、自定义配置类中配置search_fields则显示搜索框，否则不显示

　　在list_view.html中先通过if判断show_list.config.search_fields是否有值，有值则显示搜索框，否则不显示。

<h4>数据列表</h4>
<div class="container">
    <div class="row">
        <div class="col-md-9">
            {# <a href="add/" class="btn btn-primary">添加数据</a> #}
            <a href="{{ add_url }}" class="btn btn-primary">添加数据</a>
            {% if show_list.config.search_fields %}
                <form action="" class="pull-right">
                    <input type="text" name="q" value="{{ show_list.config.key_word }}">
                    <button>搜索</button>
                </form>
            {% endif %}
            <table class="table table-bordered table-striped"......>
        </div>
        <nav>
            <ul class="pagination">
                {{ show_list.pagination.page_html|safe }}
            </ul>
        </nav>
    </div>
</div>

　　在自定义配置类注释掉search_fields字段。

app01/stark.py：

class BookConfig(ModelStark):
    list_display = ["title", "price", "publishDate"]
    modelform_class = BookModelForm
    # search_fields = ['title', "price"]

site.register(Book, BookConfig)

　　页面显示：

　　

三、actions——批量处理

1、admin组件实现actions批量处理

app01/admin.py:

from django.contrib import admin
from .models import Book

class BookConfig(admin.ModelAdmin):
    list_display = ["title", "price"]

    def patch_init(self, request, queryset):
        print("queryset", queryset)
        # queryset <QuerySet [<Book: java>, <Book: python葵花宝典>]>
        queryset.update(price=100)

    patch_init.short_description = "批量初始化"
    actions = [patch_init]

admin.site.register(Book, BookConfig)

　　注意在这里可以通过patch_init.short_description设置批量操作中文名称。

批量处理前：

　　

批量处理后：

　　

2、在list_view.html中添加action选择框，重构form表单

<div class="container">
    <div class="row">
        <div class="col-md-9">
            {# <a href="add/" class="btn btn-primary">添加数据</a> #}
            <a href="{{ add_url }}" class="btn btn-primary">添加数据</a>
            {% if show_list.config.search_fields %}
                <form action="" class="pull-right">
                    <input type="text" name="q" value="{{ show_list.config.key_word }}">
                    <button>搜索</button>
                </form>
            {% endif %}
            <form action="">
                <select name="action" id="" style=" 200px; padding: 5px 8px; display: inline-block">
                    <option value="">xxxxx</option>
                </select>
                <button type="submit" class="btn-info">Go</button>
                <table class="table table-bordered table-striped"......>
                <nav.....>
            </form>
        </div>
    </div>
</div>

　　注意页面中有两个表单，一个是搜索框的表单，另一个则是包含了aciton、表格、分页。

　　页面显示效果如下所示：

　　

3、自定义配置actions

（1）构建自定义配置类actions的函数

 app01/stark.py:

class BookConfig(ModelStark):
    list_display = ["title", "price", "publishDate"]
    modelform_class = BookModelForm
    search_fields = ['title', "price"]

    def patch_init(self, request, queryset):
        print(queryset)

    patch_init.short_description = "批量初始化"
    actions = [patch_init]

site.register(Book, BookConfig)

（2）处理actions批量操作函数

/stark/service/stark.py:

class ShowList(object):
    """展示页面类"""
    def __init__(self, config, data_list, request):
        self.config = config   # 接收传递过来的配置类对象 ModelStark的实例对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象
        self.request = request   #  <WSGIRequest: GET '/stark/app01/book/?page=2'>
        # 分页
        data_count = self.data_list.count()
        current_page = int(self.request.GET.get("page", 1))  # 默认是第一页
        base_path = self.request.path   # /stark/app01/book/

        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=3, pager_count=11,)
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]
      
        # actions
        self.actions = self.config.actions   # 拿到配置好的函数对象列表  [patch_init,]
    
    def get_action_list(self):
        temp = []
        for action in self.actions:
            temp.append({
                "name": action.__name__,    # 函数.__name__：拿到函数名
                "desc": action.short_description
            })  # [{"name": "patch_init", "desc": "批量处理"}]
        return temp
    """代码省略"""

class ModelStark(object):
    """默认类，定制配置类"""
    list_display = ["__str__",]
    list_display_links = []
    modelform_class = []
    search_fields = []
    actions = []   # 调用self.actions拿到的是函数
    """代码省略"""

　　在ModelStark类中默认actions= []，因此在中实例化ShowList时，通过self将actions传递到ShowList类对象，以self.config.actions拿到配置好的函数对象列表交给get_action_list函数处理。

　　在get_action_list中循环处理函数对象列表，通过函数对象.__name__方式拿到函数名；通过函数对象.short_description拿到描述别名。以字典的形式保存在列表中返回给show_list对象交给页面进行渲染。

（3）进一步构建批量操作表单

<form action="" method="post">
    {% csrf_token %}
    <select name="action" id="" style=" 200px; padding: 5px 8px; display: inline-block">
        <option value="">-----------</option>
        {% for item in show_list.get_action_list %}
            <option value="{{ item.name }}">{{ item.desc }}</option>
        {% endfor %}
    </select>
    <button type="submit" class="btn-info">Go</button>
    <table class="table table-bordered table-striped"......>
    <nav>
        <ul class="pagination">
            {{ show_list.pagination.page_html|safe }}
        </ul>
    </nav>
</form>

　　show_list.get_action_list拿到函数的返回值temp，循环拿到的item为一个个字典，键为name的是函数名，键为desc的是描述别名。

（4）显示效果

　　

3、实现点选提交

（1）重构checkbox标签

　　点选批量操作需要拿到当前操作对象的pk值，也需要判断哪些标签被点选提交。

class ModelStark(object):
    """代码省略"""
    def checkbox(self, obj=None, header=False):
        """复选框"""
        if header:
            # 如果是表头显示操作
            return mark_safe("<input id='choice' type='checkbox'>")

        return mark_safe("<input class='choice_item' type='checkbox' name='selected_pk' value='%s'>" % obj.pk)

 （2）list_view处理post请求

class ModelStark(object):
    def list_view(self, request):
        if request.method == "POST":    # action
            print("POST:", request.POST)
            action = request.POST.get("action")
            selected_pk = request.POST.getlist("selected_pk")  # 拿到列表
            # 反射
            # self这里是配置类BookConfig，要在类中找到对应的函数
            action_func = getattr(self, action)   # patch_init
            # 拿到选中状态的pk值对象
            queryset = self.model.objects.filter(pk__in=selected_pk)  # <QuerySet [<Book: go>]>
            action_func(request, queryset)

        # 获取search的Q对象
        search_condition = self.get_search_condition(request)
        # 筛选当前表获取的数据
        data_list = self.model.objects.all().filter(search_condition)

        # 获取showlist展示页面
        show_list = ShowList(self, data_list, request)

        header_list = show_list.get_header()
        new_data_list = show_list.get_body()

        # 构建一个查看url
        add_url = self.get_add_url()
        print("add_url", add_url)
        return render(request, "list_view.html", locals())

　　在这里POST请求处理不需要返回值，批量初始化后，数据库已经更改，代码顺着下来紧接着就是查询拿到新的页面。

（3）配置校验

class BookConfig(ModelStark):
    list_display = ["title", "price", "publishDate"]
    modelform_class = BookModelForm
    search_fields = ['title', "price"]

    def patch_init(self, request, queryset):
        print(queryset)
        queryset.update(price=123)

    patch_init.short_description = "批量初始化"

    actions = [patch_init]


site.register(Book, BookConfig)

　　显示效果：

　　

4、添加admin批量操作自带的delete功能

class ShowList(object):
    def __init__(self, config, data_list, request):
        self.config = config   # 接收传递过来的配置类对象 ModelStark的实例对象
        self.data_list = data_list   # 接收传递过来的当前表的所有对象
        self.request = request   #  <WSGIRequest: GET '/stark/app01/book/?page=2'>
        # 分页
        data_count = self.data_list.count()
        current_page = int(self.request.GET.get("page", 1))  # 默认是第一页
        base_path = self.request.path   # /stark/app01/book/

        self.pagination = Pagination(current_page, data_count, base_path, self.request.GET, per_page_num=3, pager_count=11,)
        self.page_data = self.data_list[self.pagination.start:self.pagination.end]

        # actions
        # self.actions = self.config.actions   # 拿到配置好的函数对象列表  [patch_init,]
        self.actions = self.config.new_actions()   # 拿到方法运行的返回结果

    def get_action_list(self):
        """获取自定义批量操作"""
        temp = []
        for action in self.actions:
            temp.append({
                "name": action.__name__,    # 函数.__name__：拿到函数名
                "desc": action.short_description
            })  # [{"name": "patch_init", "desc": "批量处理"}]
        return temp


class ModelStark(object):
    """默认类，定制配置类"""
    list_display = ["__str__",]
    list_display_links = []
    modelform_class = []
    search_fields = []
    actions = []  # 调用self.actions拿到的是函数

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

    def patch_delete(self, request, queryset):
        """默认批量删除操作"""
        queryset.delete()

    patch_delete.short_description = "批量删除"

    def new_actions(self):
        """返回所有批量操作"""
        temp = []
        # 默认添加批量删除
        temp.append(ModelStark.patch_delete)
        # 添加自定义action
        temp.extend(self.actions)
        return temp

　　在new_actions实例方法中，首先可以通过ModelStark.patch_delete固定拿到默认需要添加的批量删除方法。其次ModelStark类中默认actions=[]，因此在自定义配置类有配置actions时，self.actions拿到默认配置类配置的列表，如果没有配置拿到空列表。然后通过extend函数扩展列表返回所有批量操作函数。

　　ShowList实例化时，self.actions属性通过self.config.new_actions()拿到new_actions返回结果。然后在模板上就可以通过show_list.config.actions渲染所有的actions操作了。

　　显示效果：

1）自定义配置类没有配置actions:

　　

2）自定义配置类配置了actions：