[QGIS-Developer] [Qgis-user] Refresh layer at interval

[Richard Duivenvoorde]

This is getting worse...

https://github.com/qgis/QGIS/issues/28282#issuecomment-720484251

Something smelling there :-(

Regards,

Richard Duivenvoorde


On 11/2/20 12:27 PM, nagyrobi_r at yahoo.com wrote:
> Thank you a lot! 
> 
> Sent from Yahoo Mail on Android <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature>
> 
>     On Mon, Nov 2, 2020 at 12:25 PM, Richard Duivenvoorde
>     <rdmailings at duif.net> wrote:
> 
>     Ah, and to reproduce, I created a temporary(!) service:
> 
>     https://duif.net/geotest/points.geojson
> 
>     which gives you one random point on the world every time you refresh
> 
>     Regards,
> 
>     Richard
> 
> 
>     On 11/2/20 12:23 PM, Richard Duivenvoorde wrote:
>     > I think you hit an old issue:
>     >
>     > https://github.com/qgis/QGIS/issues/28282
>     > and
>     > https://github.com/qgis/QGIS/issues/28744
>     >
>     > Not sure if I can tackle it, but I can give it a try.
>     > If a core-dev has a clue, please let me know...
>     >
>     > I think this should work, as this makes it supereasy to have a 'moving map'..
>     >
>     > Regards,
>     >
>     > Richard Duivenvoorde
>     >
>     >
>     > On 11/1/20 9:24 PM, nagyrobi_r at yahoo.com <mailto:nagyrobi_r at yahoo.com> wrote:
>     >>
>     >>    Hi All!
>     >>
>     >>    I am trying to understand the behavior of Layer->Render-> Refresh layer at interval in QGIS
>     >>
>     >>      1. I sat up a flask rest api which serves a geojson.
>     >>      2. I added the geojson to QGIS via Add Layer-> 
>     >>          1. a. Protocol HTTP/cloud/etc 
>     >>          2. b. Type: HTTP 
>     >>          3. c.URI: localhost/points.geojson The points are represented on the map correctly
>     >>      3. I changed the layer->Properties->Rendering-> Refresh layer at interval (5 sec)
>     >>
>     >>    I would have expected that there would be a call every 5 seconds towards the server and the map data would be updated accordingly. But the layer does not get refreshed. I don't see any changes neither when I remove a point from the json file on my local drive, nor if I change an attribute. If I press F5 then the canvas refreshes and it automatically loads the new data and I can see the changes. Is this the behavior that is wanted or am I misunderstanding the function of this tool? It seems like the data is cached somewhere?
>     >>
>     >>    |from flask import Flask from flask_restful import Api, Resource import json app = Flask(__name__) api = Api(app) class point(Resource): def get(self): with open('C:/points/venv/src/points.geojson') as json_file: data = json.load(json_file) return data api.add_resource(point,"/points.geojson") if __name__=="__main__": app.run(debug=True)|
>     >>
>     >>    |Robert Nagy|
>     >>
>     >>
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