Sha256: 609a464a0487c5fe08a48ab329d0eaa9a2155da78caf5e7608d35abb831882af
Contents?: true
Size: 1.52 KB
Versions: 7
Compression:
Stored size: 1.52 KB
Contents
= Cassandra Object
{<img src="https://secure.travis-ci.org/data-axle/cassandra_object.png?rvm=1.9.3" />}[http://travis-ci.org/data-axle/cassandra_object]
Cassandra Object uses ActiveModel to mimic much of the behavior in ActiveRecord.
== Installation
Add the following to your Gemfile:
gem 'gotime-cassandra_object'
Change the version of Cassandra accordingly. Recent versions have not been backward compatible.
== Defining Models
class Widget < CassandraObject::Base
string :name
string :description
integer :price
array :colors, unique: true
validates :name, presence: :true
before_create do
self.description = "#{name} is the best product ever"
end
end
== Connecting to the Server
CassandraObject::Base.config = {
keyspace: 'my_app_development',
servers: '127.0.0.1:9160',
thrift: {
timeout: 20
retries: 2
}
}
== Creating and updating records
Cassandra Object has equivalent methods as ActiveRecord:
widget = Widget.new
widget.valid?
widget = Widget.create(name: 'Acme', price: 100)
widget.update_attribute(:price, 1200)
widget.update_attributes(price: 1200, name: 'Acme Corporation')
widget.attributes = {price: 300}
widget.price_was
widget.save
widget.save!
== Finding records
widget = Widget.find(uuid)
widget = Widget.first
widgets = Widget.all
Widget.find_each do |widget|
...
end
== Scoping
Some lightweight scoping features are available:
Widget.where('color' => 'red')
Widget.select(['name', 'color'])
Widget.limit(10)
Version data entries
7 entries across 7 versions & 1 rubygems