Class: Juno::Adapters::ActiveRecord

Inherits:
Base
  • Object
show all
Defined in:
lib/juno/adapters/activerecord.rb

Overview

ActiveRecord as key/value stores

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#[], #[]=, #close, #fetch

Constructor Details

#initialize(options = {}) ⇒ ActiveRecord

Constructor

Options:

  • :table - Table name (default juno)

  • :connection - ActiveRecord connection

Parameters:

  • options (Hash) (defaults to: {}) 


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# File 'lib/juno/adapters/activerecord.rb', line 21

def initialize(options = {})
  table = options[:table] || 'juno'
  @table = self.class.tables[table] ||=
    begin
      c = Class.new(::ActiveRecord::Base)
      c.table_name = table
      c.primary_key = :k
      c
    end
  @table.establish_connection(options[:connection]) if options[:connection]
  unless @table.table_exists?
    @table.connection.create_table(@table.table_name, :id => false) do |t|
      # Do not use binary columns (Issue #17)
      t.string :k, :null => false
      t.string :v
    end
    @table.connection.add_index(@table.table_name, :k, :unique => true)
  end
end

Instance Attribute Details

#table ⇒ Object (readonly) 



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# File 'lib/juno/adapters/activerecord.rb', line 12

def table
  @table
end

Class Method Details

.tables ⇒ Object 



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# File 'lib/juno/adapters/activerecord.rb', line 8

def self.tables
  @tables ||= {}
end

Instance Method Details

#clear(options = {}) ⇒ Object 



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# File 'lib/juno/adapters/activerecord.rb', line 68

def clear(options = {})
  @table.delete_all
  self
end

#delete(key, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/activerecord.rb', line 50

def delete(key, options = {})
  @table.transaction do
    record = @table.find_by_k(key)
    if record
      record.destroy
      record.v
    end
  end
end

#key?(key, options = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/juno/adapters/activerecord.rb', line 41

def key?(key, options = {})
  !!@table.find_by_k(key)
end

#load(key, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/activerecord.rb', line 45

def load(key, options = {})
  record = @table.find_by_k(key)
  record ? record.v : nil
end

#store(key, value, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/activerecord.rb', line 60

def store(key, value, options = {})
  @table.transaction do
    record = @table.find_or_initialize_by_k(key)
    record.update_attributes(:v => value)
    value
  end
end