Overview

CouchbaseEraser wraps the Couchbase client, tracks every write you perform, and provides a method to delete every key that you wrote to.

This is useful for testing, where you want to avoid your tests interfering with each other by leaving data around in Couchbase.

Usage

In your spec/spec_helper.rb or similar, assuming you have a class WidgetCache with a class method WidgetCache.couchbase which returns the Couchbase client:

require 'couchbase/eraser'

class << WidgetCache
  def couchbase_with_erasure
    couchbase_eraser
  end

  def couchbase_eraser
    @couchbase_eraser ||= Couchbase::Eraser.new(couchbase_without_erasure)
  end

  alias_method_chain :couchbase, :erasure
end

RSpec.configure do |config|
  config.after(:each) do
    WidgetCache.couchbase_eraser.erase_written_keys
  end
end

Limitations

For now the only supported operations are GET, SET and DELETE, although it shouldn't be hard to support more methods. (For an operation which straightforwardly reads from or writes to a single key, it's a one-line change to add support for it. Operations with more complicated semantics, such as map-reduce, will be harder to support.)