CRM客户关系管理系统（六） 第六章、排序和搜索功能开发

@register.simple_tag
def get_sorted_column(column,sorted_column,forloop):
    '''排序'''
    if column in sorted_column:    #如果这一列被排序了
        #要判断上一次排序是按什么顺序，本次取反
        last_sort_index = sorted_column[column]
        if last_sort_index.startswith('-'):
            #利用切片，去掉‘-’
            this_time_sort_index = last_sort_index.strip('-')
        else:
            #加上 '-'
            this_time_sort_index = '-%s'% last_sort_index
        return this_time_sort_index
    else:
        return forloop

def get_orderby_result(request,querysets,admin_class):
    '''排序'''

    current_ordered_column = {}
    #通过前端获取到要排序的字段的索引（是个字符串）
    orderby_index = request.GET.get('_o')
    if orderby_index:
        #通过索引找到要排序的字段,因为索引有可能是负数也有可能是负数，要用绝对值，否则负值的时候取到了其它字段了
        orderby_key = admin_class.list_display[abs(int(orderby_index))]
        #记录下当前是按什么排序字段的
        current_ordered_column[orderby_key] = orderby_index
        if orderby_index.startswith('-'):
            orderby_key = '-' + orderby_key

        return querysets.order_by(orderby_key),current_ordered_column
    else:
        return querysets,current_ordered_column

<th><a href="?_o={% get_sorted_column column sorted_column forloop.counter0 %}">{{ column }}</a></th>

@register.simple_tag
def render_sorted_arrow(column,sorted_column):
    '''排序的图标'''

    if column in sorted_column:
        last_sort_index = sorted_column[column]
        if last_sort_index.startswith('-'):
            arrow_direction = 'bottom'

        else:
            arrow_direction = 'top'
        ele = '''<span class="glyphicon glyphicon-triangle-%s" aria-hidden="true"></span>'''% arrow_direction
        return mark_safe(ele)

    return ''

<th><a href="?_o={% get_sorted_column column sorted_column forloop.counter0 %}">
                                {{ column }}{% render_sorted_arrow column sorted_column %}
                            </a></th>

@register.simple_tag
def render_filtered_args(admin_class):
    '''拼接过滤的字段'''
    if admin_class.filter_conditions:
        ele = ''
        for k,v in admin_class.filter_conditions.items():
            ele += '&%s=%s'%(k,v)
        return mark_safe(ele)
    else:
        return ''

@register.simple_tag
def get_current_sorted_column_index(sorted_column):
    #三元运算，如果为True执行左边的，为False，执行右边的（''）
    return list(sorted_column.values())[0] if sorted_column else ''

from django.db.models import Q

def get_searched_result(request,querysets,admin_class):
    '''搜索'''

    search_key = request.GET.get('_q')
    if search_key:
        q = Q()
        q.connector = 'OR'

        for search_field in admin_class.search_fields:
            q.children.append(("%s__contains"%search_field,search_key))

        return querysets.filter(q)
    return querysets

 <form action="">
            <input type="search" placeholder="{% for s in admin_class.search_fields %}{{ s }},{% endfor %}" name="_q" value="{{ admin_class.search_key }}">
            <input type="submit" value="Search">
            {% for k,v in admin_class.filter_conditions.items %}
                <input type="hidden" name="{{ k }}" value="{{ v }}">
            {% endfor %}
        </form>