Re: Signals - Need a signal after annotations are added

[samarth parashari]

django signal are work like database trigger.

On Sun, Feb 24, 2019 at 12:35 PM Mike Brown  wrote:

>  I think this is a request for a signal that fires after those attributes
>> have been added to the model instances.
>>
>
> Yes.
>
>
> On Saturday, February 23, 2019 at 12:08:43 PM UTC-8, Mike Brown wrote:
>>
>> I have a situation where I need a signal for when a model object is fully
>> instantiated.
>>
>> Currently, there are signals for pre_init and post_init. However, when
>> post_init is fired,
>> the object is not fully 'initialized' in the sense that annotations have
>> not yet been added to the object.
>>
>>
>> In django.db.models.query there is class ModelIterable(BaseIterable)
>>
>> In this class there is code to run a query and then apply annotations.
>>
>> Should there be a new signal added to Django that is fired after the
>> annotations are complete and the object is fully instantiated?
>>
>> Maybe a signal called 'instantiation_complete'?
>>
>>
>> --
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Re: Trying to transfer some data in Sec-websocket-protocol. But the browser breaks the connection with error ----Error during WebSocket handshake: Sent non-empty 'Sec-WebSocket-Protocol' header but no

[samarth parashari]

Try django channels for websocket and handshaking

On Wed, 6 Mar, 2019, 12:02 AM Abhishek Chauhan, 
wrote:

> Error during WebSocket handshake: Sent non-empty 'Sec-WebSocket-Protocol'
> header but no response was received. How can i reply to subprotocol request
> so that the browser does not give me the above error.
>
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