问题
在xadmin中, 对于字段类型是ImageField的, 进入编辑页面, 如果改动其他字段而不理会ImageField字段, 点击保存, 会报错, 图片的字段未上传, 因为必须把图片重新传一遍. 这是xadmin的bug
解决
修改AdminImageWidget类, 最后添加一个方法, 最终效果如下:
class AdminImageWidget(forms.FileInput):
"""
A ImageField Widget that shows its current value if it has one.
"""
def __init__(self, attrs={}):
super(AdminImageWidget, self).__init__(attrs)
def render(self, name, value, attrs=None, renderer=None):
output = []
if value and hasattr(value, "url"):
label = self.attrs.get('label', name)
output.append(
'<a href="%s" target="_blank" title="%s" data-gallery="gallery"><img src="%s" class="field_img"/></a><br/>%s ' %
(value.url, label, value.url, _('Change:')))
output.append(super(AdminImageWidget, self).render(name, value, attrs, renderer))
return mark_safe(u''.join(output))
def use_required_attribute(self, initial):
return super(AdminImageWidget, self).use_required_attribute(initial) and not initial