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Rails 4 + Postgres = NoSQL
Yoni Weisbrod@yoniweisbrod
500tech
hstore
500tech
User
photo_url :string
name :string
verified? :bool
email :string
Yo
@yoniweisbrod
User
photo_url :string
name :string
verified? :bool
email :string
Yo
LinkedInprofiles :hstore
@yoniweisbrod
> u = User.first
> u.profiles = {yo: “yoni_w”, linked_in: “yweisbrod”}
Not just a Hash
@yoniweisbrod
hstore
flexibility of NoSQL
integration with a relational database
no maintenance of an additional database
fully queryable
@yoniweisbrod
Enable hstore on your Postgres database
# db/migrate/20131220144913_enable_hstore.rb
def up
enable_extension “hstore"end
def down
disable_extension “hstore”
end
@yoniweisbrod
Add the hstore field to your table
# db/migrate/20131220145432_add_profiles_to_users.rb
def change
add_column :users, :profiles, :hstoreend
@yoniweisbrod
Add accessor methods for known keys
class User < ActiveRecord::Base
store_accessor :profiles, :yo, :linkedin
end
User.first.yo
@yoniweisbrod
Great Rails Integration
• Add validations for specific keys
• Add indexes to speed up queries
@yoniweisbrod
Gotchas
• All strings
• No nested hashes.
nested-hstore gem
hstore_accessor gem
@yoniweisbrod
powerful query operands
@yoniweisbrod
User.where(“profiles -> ‘yo’ = :name”, name: ‘yoni’)
Query the value of a key
@yoniweisbrod
User.where(“profiles ?& ARRAY[‘yo’, ‘linked_in’]”)
User.where(“profiles ?| ARRAY[‘yo’, ‘linked_in’]”)
User.where(“profiles ? ‘yo’”)
Query the presence of a key
@yoniweisbrod
User.where(“profiles @> :kv”, kv: “yo=>yoni_w”)
Query the presence of a key-value pair
@yoniweisbrod
Rails 4 + Postgres = NoSQL
hstore
500tech
Yoni Weisbrod@yoniweisbrod
500tech
