让Django的BooleanField支持字符串形式的输入方式

from django.db.models import BooleanField as _BooleanField

class BooleanField(_BooleanField):  
  def get_prep_value(self, value):    
    if value in ("0", "false", "False"):      
      return False    
    elif value in ("1", "true", "True"):      
      return True    
    else:      
      return super(BooleanField, self).get_prep_value(value)

  def get_readonly_fields(self, request, obj=None):
    """ 重新定义此函数，限制普通用户所能修改的字段 """
    if request.user.is_superuser:
      self.readonly_fields = []
    return self.readonly_fields

  readonly_fields = ('machine_ip', 'status', 'user', 'machine_model', 'cache',
            'cpu', 'hard_disk', 'machine_os', 'idc', 'machine_group')

  def identity(self,ext):
    return ext.user.get_types_display()
  identity.short_description='身份'
  # identity.admin_order_field = 'end_date'

# 设置列表显示字段
list_display = ['name', 'course_org', 'detail','degree','learn_times','students','fav_nums','image','click_nums','add_time']

# 设置列表查询字段
search_field = ['name', 'course_org', 'detail','degree','learn_times','students','fav_nums','image','click_nums']

# 设置列表过滤字段
list_filter = ['name', 'course_org', 'detail','degree','learn_times','students','fav_nums','image','click_nums','add_time']

# 设置显示图标
model_icon = 'fa fa-check-square' # 设置字段可以直接在列表页修改 list_editable=['desc','degree']

# 设置默认排序
ordering=['-click_nums']

# 设置详情页面只读显示
readonly_fields=['fav_nums','click_nums']

# 设置详情页面不显示某个字段
exclude=['add_time']

#自动刷新列表页面（秒数）
refresh_times = [3,5]