Put another way: creating an instance is not a page move.

On Mon, May 26, 2014 at 4:21 PM, Ahmad Khayyat <[email protected]> wrote:

> Right. Yes, they can. But that would be handled by the save method of the
> MyPage model (this is what I do in my app). I don't know of a way to handle
> it in the page tree.
>
>
> On Mon, May 26, 2014 at 4:18 PM, Stephen McDonald <[email protected]> wrote:
>
>> Seems incomplete for the use-case - couldn't the user create a new MyPage
>> instance as a top-level page?
>>
>>
>> On Mon, May 26, 2014 at 10:26 PM, Ahmad Khayyat <[email protected]>wrote:
>>
>>> ​Any comments?
>>> Any additional information required?
>>>
>>> Here is an example that uses this feature to disallow pages of type
>>> MyPage to be top-level pages:
>>>
>>>
>>>
>>> from mezzanine.pages.signals import pre_page_move
>>> @receiver(pre_page_move, sender=MyPage)def my_move_constraints(sender, 
>>> page, new_parent, **kwargs):
>>>
>>>     if new_parent is None:
>>>         return "Pages of type MyPage cannot be top-level pages"
>>>
>>> ​If a user drags a MyPage to a top-level position in the page tree in
>>> Mezzanine admin, the page will be moved back to its original position, and
>>> an error message will be displayed using Django messages. The text of the
>>> error message is the returned string: “Pages of type MyPage cannot be
>>> top-level pages”. A subsequent valid move will remove the error message.​
>>> ​
>>>
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>>
>>
>>
>> --
>> Stephen McDonald
>> http://jupo.org
>>
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>

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