Django channels are official way for implementing async messaging in Django.
The primary caveat when working with GraphQL subscription is that we can't serialize message before broadcasting it to Group of subscribers. Each subscriber might use different GraphQL query so we don't know how to serialize instance in advance.
See related issue
| from __future__ import unicode_literals | |
| from django.db import models | |
| from django.db.models.fields.related_descriptors import ForwardManyToOneDescriptor # noqa | |
| class RelationNotLoaded(Exception): | |
| pass |
By: @BTroncone
Also check out my lesson @ngrx/store in 10 minutes on egghead.io!
Update: Non-middleware examples have been updated to ngrx/store v2. More coming soon!
Table of Contents
(by @andrestaltz)
If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.
| #! /bin/sh | |
| ### BEGIN INIT INFO | |
| # Provides: supervisord | |
| # Required-Start: $local_fs $remote_fs $networking | |
| # Required-Stop: $local_fs $remote_fs $networking | |
| # Default-Start: 2 3 4 5 | |
| # Default-Stop: 0 1 6 | |
| # Short-Description: Starts supervisord - see http://supervisord.org | |
| # Description: Starts and stops supervisord as needed - see http://supervisord.org | |
| ### END INIT INFO |
| #!/bin/sh | |
| # download | |
| wget http://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.20.4.zip | |
| # unzip and start | |
| unzip elasticsearch-0.20.4.zip | |
| cd elasticsearch-0.20.4 | |
| # remove data in case you have defined some analyzers in the past (e.g. stop/start) | |
| rm -rf data/ |
| If you want, I can try and help with pointers as to how to improve the indexing speed you get. Its quite easy to really increase it by using some simple guidelines, for example: | |
| - Use create in the index API (assuming you can). | |
| - Relax the real time aspect from 1 second to something a bit higher (index.engine.robin.refresh_interval). | |
| - Increase the indexing buffer size (indices.memory.index_buffer_size), it defaults to the value 10% which is 10% of the heap. | |
| - Increase the number of dirty operations that trigger automatic flush (so the translog won't get really big, even though its FS based) by setting index.translog.flush_threshold (defaults to 5000). | |
| - Increase the memory allocated to elasticsearch node. By default its 1g. | |
| - Start with a lower replica count (even 0), and then once the bulk loading is done, increate it to the value you want it to be using the update_settings API. This will improve things as possibly less shards will be allocated to each machine. | |
| - Increase the number of machines you have so |
| """ | |
| jQuery templates use constructs like: | |
| {{if condition}} print something{{/if}} | |
| Or like: | |
| {% if condition %} print {%=object.something %}{% endif %} | |
| This, of course, completely screws up Django templates, |
| @events = | |
| events: {} | |
| on: (topic, handler, context = this) -> | |
| (@events[topic] or= []).push {handler, context} | |
| trigger: (topic, args...) -> | |
| return unless @events[topic]? | |
| handler.apply(context, args) for {handler, context} in @events[topic] |
