def register_class_attribute(cls, k, v):
if isinstance(v, fields.Constant):
cls.add_constant(k, v)
elif isinstance(v, fields.VirtualField): # 20120903b
cls.add_virtual_field(k, v)
elif isinstance(v, models.Field): # 20130910
#~ print "20130910 add virtual field " ,k, cls
vf = fields.VirtualField(v, field_getter(k))
cls.add_virtual_field(k, vf)
def inject_quick_add_buttons(model, name, target):
"""
Injects a virtual display field `name` into the specified `model`.
This field will show up to three buttons
`[New]` `[Show last]` `[Show all]`.
`target` is the table that will run these actions.
It must be a slave of `model`.
"""
def fn(self, ar):
if ar is None:
return ''
return ar.renderer.quick_add_buttons(
ar.spawn(target, master_instance=self))
tm = resolve_model(target.model)
inject_field(model, name,
fields.VirtualField(fields.DisplayField(
tm._meta.verbose_name_plural), fn))