januszm

class Array
  def to_csv(csv_filename="hash.csv")
    require 'csv'
    CSV.open(csv_filename, "wb") do |csv|
      csv << first.keys # adds the attributes name on the first line
      self.each do |hash|
        csv << hash.values
      end
    end
  end

januszm

```ruby
record = Model.where("data->'$.somearray[0].email' = ?", email).first
```

januszm

SELECT
  TABLE_NAME AS `Table`,
  ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `Size (MB)`
FROM
  information_schema.TABLES
WHERE
  TABLE_SCHEMA = "mydatabase"
ORDER BY
  (DATA_LENGTH + INDEX_LENGTH)
DESC;

januszm

sudo amazon-linux-extras install postgresql12
pg_dump -Fc -O -h yyy-production.xxx.region.rds.amazonaws.com -p 5432 -U yyy yyy_production -f yyy.dump
# TRUNCATE TABLE tables ... RESTART IDENTITY
# rails db:migrate
pg_restore -Fc -O --disable-triggers --data-only -h yyy-staging.xxx.region.rds.amazonaws.com -d yyy_staging -U yyy yyy.dump
# both commands accept the --table option to specify which table to dump/restore
# select setval('TABLE_NAME_id_seq', (select max(id) from TABLE_NAME)); may be required after RESTART IDENTITY, +1

# In case of version mismatch between the server and pg_dump, add pgdgXX repo and install XX client
[pgdg14]

januszm

DROP extension postgis CASCADE;
/*
drop cascades to column shape of table MYTABLE_points
drop cascades to column shape of table MYTABLE_areas
*/

/* Upgrade PostgreSQL */

CREATE extension postgis;

januszm

# Currently (2017/2018) it's not possible to change the Ruby 'minor' version (eg. 2.3 => 2.4) using the web console
# However, it's possible using the 'awscli' tool.

brew install awscli # pip install awscli
aws elasticbeanstalk update-environment \
  --solution-stack-name "64bit Amazon Linux 2017.09 v2.6.1 running Ruby 2.4 (Puma)" \
  --environment-name "myappenv1" --region "us-east-2" \
  --version-label "app-1234-210000_120123"

# For Amazon Linux 2

januszm

SELECT 
    TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, COLUMN_DEFAULT
FROM
    INFORMATION_SCHEMA.COLUMNS
WHERE
    TABLE_NAME='Xxx';

januszm

#!/bin/bash

# -d for no data, just structure
# -t for no create, just data
# --ignore-table=name1 --ignore-table=name2
# --skip-comments
# include table names after DATABASE
mysqldump -u USER -h HOST -p DATABASE | gzip > DATABASE.sql.gz

# load

januszm

rails_version = '6.1.3'
# Include rails specific gems
# We need this until https://github.com/rails/rails/issues/41750 is resolved
gem 'actioncable', rails_version
gem 'actionmailer', rails_version
gem 'actionpack', rails_version
gem 'actionview', rails_version
gem 'activejob', rails_version
gem 'activemodel', rails_version
gem 'activerecord', rails_version

januszm

# first, backup running config
docker exec -it -u 0 grafana bash
cat /etc/grafana/grafana.ini
# copy output and paste to backup file somewhere or use docker cp
docker cp grafana:/etc/grafana/grafana.ini grafana.ini.bak

docker pull grafana/grafana:latest
docker stop grafana
docker rm grafana
docker run --name grafana --detach=true --publish 80:3000 --link graphite:graphite --volumes-from grafana-storage grafana/grafana