Redpear¶ ↑

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A simple, elegant & efficient ORM for Redis, optimised for speed!

Redis is a simple key/value store, hence storing structured data can be a challenge. Redpear allows you to store/find/associate “records” in a Redis DB very efficiently, minimising IO operations and storage space where possible.

class Post < Redpear::Model
  column :title
  column :body
end

class Comment < Redpear::Model
  column :body
  index :post_id
end

Let’s create a post and a comment:

post = Post.new :title => "Hi!", :body => "I'm a new post"
post.id # => 100, automatically persisted
comment = Comment.new :post_id => post.id, :body => "I like this!"
comment.id # => 200

Now let’s find and update a Comment:

comment = Comment.find 200
comment.body = "This is fun!"

Under the hood:

Redis.current.keys
# => [ "posts:[~]",   # => Set { 1 } - stores the primary keys of all posts
#      "posts:[+]",   # => Counter value: "100" - stores last primary key value
#      "posts:100",   # => Hash { title: "Hi!", body: "I'm a new post" }
#      "comments:[~]" # => Set, as above, just for comments
#      "comments:[+]" # => Counter, as above, just for comments
#      "comments:200" # => Hash { post_id: 100, body: "I like this!" }
#      "comments:[post_id]:100" # => Set { 200 } - lookup for comments that
#                               # belong to post #100
#    ]

You should be familiar with gembundler.com/. Simply include redpear in your Gemfile:

gem "redpear"

You can additionally include the hiredis extension (written in C), you you want to make use of it:

gem "hiredis", "~> 0.3.1"
gem "redis", "~> 2.2.0", :require => ["redis/connection/hiredis", "redis"]

Please see github.com/pietern/hiredis-rb for more details.

Redpear is VERY lightweight. Compared with other ORMs, it offers raw speed at the expense of convenience.

• Uses the latest Redis features

• Minimises number of IO operations

• Minimises storage space (memory)

• Thread-safe

• “Lazy” where possible/reasonable

Copyright (c) 2011-2013 Black Square Media

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