Class: AutoReplica::Adapter

Inherits:
Object
  • Object
show all
Defined in:
lib/activerecord_autoreplica.rb

Overview

Acts as a wrapping proxy that replaces an ActiveRecord Adapter object. This is the "connection adapter" object that ActiveRecord uses internally to run SQL queries against. We let it dispatch all SELECT queries to the read replica and all other queries to the master database.

To achieve this, we make a delegator proxy that sends all methods prefixed with "select_" to the read connection, and all the others to the master connection.

Instance Method Summary collapse

Constructor Details

#initialize(master_connection_adapter, replica_connection_adapter) ⇒ Adapter

a proxy for ActiveRecord::ConnectionAdapters::AbstractAdapter



201
202
203
204
 
# File 'lib/activerecord_autoreplica.rb', line 201

def initialize(master_connection_adapter, replica_connection_adapter)
  @master_connection = master_connection_adapter
  @read_connection = replica_connection_adapter
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &blk) ⇒ Object 



224
225
226
 
# File 'lib/activerecord_autoreplica.rb', line 224

def method_missing(method_name, *args, &blk)
  @master_connection.public_send(method_name, *args, &blk)
end

Instance Method Details

#respond_to_missing?(method_name) ⇒ Boolean

The duo for method proxying without delegate

Returns:

  • (Boolean) 


221
222
223
 
# File 'lib/activerecord_autoreplica.rb', line 221

def respond_to_missing?(method_name)
  @master_connection.respond_to?(method_name)
end