James Dela Cruz delacruzjames

-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;

-- Then change column name of  your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

NERDTree

o.......Open files, directories and bookmarks....................|NERDTree-o|
go......Open selected file, but leave cursor in the NERDTree.....|NERDTree-go|
t.......Open selected node/bookmark in a new tab.................|NERDTree-t|
T.......Same as 't' but keep the focus on the current tab........|NERDTree-T|
i.......Open selected file in a split window.....................|NERDTree-i|
gi......Same as i, but leave the cursor on the NERDTree..........|NERDTree-gi|
s.......Open selected file in a new vsplit.......................|NERDTree-s|
gs......Same as s, but leave the cursor on the NERDTree..........|NERDTree-gs|

O.......Recursively open the selected directory..................|NERDTree-O|

Deploying a basic Ruby on Rails app with Postgres Database to Microsoft Azure

This was written on 8 November, 2019. Some of the issues mentioned below were discovered and resolved with the help of Microsoft support staff, and will hopefully be fixed in the near future.

Overview

The steps below are mostly taken from this tutorial, Deploying your Rails + PostgreSQL app on Microsoft Azure, but have also been influenced by these two other tutorials: Create a Ruby on Rails App in App Service on Linux and Build a Ruby and Postgres app in Azure App Service on Linux.

The descriptions of each step are my own personal understanding. I'm not an Azure expert, so they may not be correct 100% of the time.

Rails Version Note: The versions u

Gemfile

gem 'simple_form'

Installation

rails generate simple_form:install

	FROM ruby:2.3.1

	# Install dependencies
	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs

	# Set an environment variable where the Rails app is installed to inside of Docker image:
	ENV RAILS_ROOT /var/www/app_name
	RUN mkdir -p $RAILS_ROOT

	# Set working directory, where the commands will be ran:

	from alembic import op
	from alembic.operations.ops import CreatePrimaryKeyOp, CreateForeignKeyOp
	import sqlalchemy as sa

	def upgrade():

	conn = op.get_bind()
	ctx = op.get_context()
	existing_metadata = sa.schema.MetaData()
	target_metadata = ctx.opts['target_metadata']

	Using gem aws-sdk for a ror application for uploading images to s3
	Uploading images to a fixed bucket with different folders for each object or application.
	The s3 keeps a limitation on the number of buckets creattion whereas there is no
	limitation for content inside a bucket.

	This code will upload image for a user to s3 using aws-sdk gem. The bucket and the image uploaded are made public
	so that the images uploaded are directly accessible. The input it takes is the image complete path
	where it is present, folder in which it should be uploaded and user_id for whom it should
	be uploaded.

	# Sidekiq interaction and startup script
	commands:
	create_post_dir:
	command: "mkdir -p /opt/elasticbeanstalk/hooks/appdeploy/post"
	ignoreErrors: true
	files:
	"/opt/elasticbeanstalk/hooks/appdeploy/post/50_restart_sidekiq.sh":
	mode: "000755"
	owner: root
	group: root

	# Sidekiq interaction and startup script
	commands:
	create_post_dir:
	command: "mkdir -p /opt/elasticbeanstalk/hooks/appdeploy/post"
	ignoreErrors: true
	files:
	"/opt/elasticbeanstalk/hooks/appdeploy/post/50_restart_sidekiq.sh":
	mode: "000755"
	owner: root
	group: root