Essential Books

Create a hstore column

suggest change

Hstore columns can be useful to store settings. They are available in PostgreSQL databases after you enabled the extension. 

class CreatePages < ActiveRecord::Migration[5.0]
  def change
    create_table :pages do |t|
      enable_extension 'hstore' unless extension_enabled?('hstore')
      t.hstore :settings
      t.timestamps
    end
  end
end
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ActiveRecord migrations:
* ActiveRecord Migrations
* Adding multiple columns to a table
* Add a reference column to a table
* Rollback migrations
* Add a new column with an index
* Run specific migration
* Redo migrations
* Remove an existing column from a table
* Add a new column to a table
* Create a new table
* Running migrations
* Running migrations in different environments
* Add column with default value
* Change an existing columns type
* Create a hstore column
* Add a self reference
* Create a join table
* Create an array column
* Changing Tables
* Checking migration status
* Add an unique column to a table
* Forbid null values
* Adding a NOT NULL constraint to existing data
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0 Getting started with Ruby on Rails
1 Routing
2 ActiveRecord
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4 ActiveRecord migrations
5 Rails best practices
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29 Upgrading Rails
30 ActiveRecord locking
31 Debugging
32 Configure Angular with Rails
33 Rails logger
34 Prawn PDF
35 Rails API
36 Deploying a Rails app on Heroku
37 ActiveSupport
38 Form Helpers
39 ActiveRecord transactions
40 RSpec and Ruby on Rails
41 Decorator pattern
42 Elasticsearch
43 React with Rails
44 Rails cookbook
45 Multi-purpose ActiveRecord columns
46 Class organization
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48 Model states AASM
49 Rails 5 API Authentication
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53 Nested form
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55 CSV
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58 Active Model serializers
59 Rails Engine - Modular Rails
60 Single Table inheritance
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64 Securely storing authentications keys
65 Authenticate API using Devise
66 Integrating React.js with Rails using Hyperloop
67 Change a default Rails application environment
68 Reserved words
69 Rails-Engines
70 Adding an Amazon RDS
71 Payment features in Rails
72 Rails on docker
73 Contributors