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How to install PostgreSQL and pgAdmin4 on Ubuntu 18.04

1. Install PostgreSQL $ sudo apt update $ sudo apt install postgresql postgresql-contrib 2. Update password for postpres user $ sudo -u postgres psql postgres=# ALTER USER user_name WITH PASSWORD 'new_password'; postgres=# \q 3. Install Python PIP for Ubuntu $ sudo apt update $ sudo apt install python3-pip 4. Get the PgAdmin 4 Python Installer at https://www.pgadmin.org/download/pgadmin-4-python-wheel 5. Install pgAdmin4 $ pip install ~/Downloads/pgadmin4*.whl Or for a System wide installation: $ sudo pip install ~/Downloads/pgadmin4*.whl 6. Locate PgAdmin 4 Script $ sudo updatedb $ locate pgAdmin4.py Copy the path displayed from above command. I call it PATH /pgAdmin4.py from now 7. Create config_local.py file for pgAdmin4 local config, add content and save it $ vim PATH /config_local.py import os SERVER_MODE = False DATA_DIR = os.path.realpath(os.path.expanduser(u'~/.pgadmin/')) LOG_FILE = os.path.join(DATA_DIR...
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Phoenix Channels

Channels  Channels add Soft-Real time feature to our application. Channels - Sending and Receiving messages. Senders broadcast messages about Topics.Receivers subscribe to topics so that they can get those messages. Main Parts in Real Time Communication 1.Socket Handlers Socket handlers, such as lib/hello_web/channels/user_socket.ex, are modules that authenticate and identify a socket connection and allow you to set default socket assigns for use in all channels. 2.Channel Routes These are defined in Socket handlers, such as lib/hello_web/channels/user_socket.ex, which makes them distinct from other routes. They match on the topic string and dispatch matching requests to the given Channel module. channel "sample_topic:*" , HelloWeb . SampleTopicChannel They match on the topic string and dispatch matching requests to the given Channel module. The star character * acts as a wildcard matcher, so in the above example route, requests for sampl...
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