Fetch adapter from database configuration

lib/active_record/connection_adapters/percona_adapter.rb

@@ -13,7 +13,12 @@ def percona_connection(config)
         config = config.dup if config.frozen?
         config[:username] = 'root'
       end
-      connection = send("#{Departure.configuration.adapter}_connection", config)
+      adapter = config[:adapter]
+      connection = if Departure::SUPPORTED_ADAPTERS.include?(adapter)
+                     send("#{adapter}_connection", config)
+                   else
+                     raise ArgumentError, "Supported Departure adapters are #{Departure::SUPPORTED_ADAPTERS.inspect}"
+                   end
 
       connection_details = Departure::ConnectionDetails.new(config)
       verbose = ActiveRecord::Migration.verbose

lib/departure.rb

@@ -28,6 +28,8 @@
 end
 
 module Departure
+  SUPPORTED_ADAPTERS = %i[trilogy mysql2].freeze
+
   class << self
     attr_accessor :configuration
   end

lib/departure/configuration.rb

@@ -1,31 +1,19 @@
 module Departure
   class Configuration
-    SUPPORTED_ADAPTERS = %i[trilogy mysql2].freeze
-
     attr_accessor :tmp_path, :global_percona_args, :enabled_by_default, :redirect_stderr
-    attr_reader :adapter
 
     def initialize
       @tmp_path = '.'.freeze
       @error_log_filename = 'departure_error.log'.freeze
       @global_percona_args = nil
       @enabled_by_default = true
       @redirect_stderr = true
-      @adapter = :mysql2
     end
 
     def error_log_path
       File.join(tmp_path, error_log_filename)
     end
 
-    def adapter=(name)
-      unless SUPPORTED_ADAPTERS.include?(name)
-        raise ArgumentError, "Supported Departure adapters are #{SUPPORTED_ADAPTERS.inspect}"
-      end
-
-      @adapter = name
-    end
-
     private
 
     attr_reader :error_log_filename