add .default_strategy method to all adapters, and move knowledge into it from core.

adapters/database_cleaner-active_record/lib/database_cleaner/active_record/base.rb

@@ -4,11 +4,14 @@ require 'erb'
 
 module DatabaseCleaner
   module ActiveRecord
-
     def self.available_strategies
       %w[truncation transaction deletion]
     end
 
+    def self.default_strategy
+      :transaction
+    end
+
     def self.config_file_location=(path)
       @config_file_location = path
     end

adapters/database_cleaner-active_record/spec/database_cleaner/active_record/base_spec.rb

@@ -11,6 +11,10 @@ end
 RSpec.describe DatabaseCleaner::ActiveRecord do
   it { is_expected.to respond_to(:available_strategies) }
 
+  it "has a default_strategy of transaction" do
+    expect(described_class.default_strategy).to eq(:transaction)
+  end
+
   describe "config_file_location" do
     after do
       # prevent global state leakage

adapters/database_cleaner-couch_potato/lib/database_cleaner/couch_potato.rb

@@ -3,3 +3,9 @@ require "database_cleaner"
 require "database_cleaner/couch_potato/base"
 require "database_cleaner/couch_potato/truncation"
 
+module DatabaseCleaner::CouchPotato
+  def self.default_strategy
+    :truncation
+  end
+end
+

adapters/database_cleaner-couch_potato/spec/database_cleaner/couch_potato/base_spec.rb

@@ -0,0 +1,8 @@
+require 'database_cleaner/couch_potato'
+
+RSpec.describe DatabaseCleaner::CouchPotato do
+  it "has a default_strategy of truncation" do
+    expect(described_class.default_strategy).to eq(:truncation)
+  end
+end
+

adapters/database_cleaner-data_mapper/lib/database_cleaner/data_mapper/base.rb

@@ -5,6 +5,10 @@ module DatabaseCleaner
       %w[truncation transaction]
     end
 
+    def self.default_strategy
+      :transaction
+    end
+
     module Base
       include ::DatabaseCleaner::Generic::Base
 

adapters/database_cleaner-data_mapper/spec/database_cleaner/data_mapper/base_spec.rb

@@ -4,6 +4,10 @@ require 'database_cleaner/spec'
 module DatabaseCleaner
   RSpec.describe DataMapper do
     it { is_expected.to respond_to(:available_strategies) }
+
+    it "has a default_strategy of transaction" do
+      expect(described_class.default_strategy).to eq(:transaction)
+    end
   end
 
   module DataMapper

adapters/database_cleaner-mongo/lib/database_cleaner/mongo.rb

@@ -1,3 +1,10 @@
 require 'database_cleaner/mongo/version'
 require 'database_cleaner'
 require 'database_cleaner/mongo/truncation'
+
+module DatabaseCleaner::Mongo
+  def self.default_strategy
+    :truncation
+  end
+end
+

adapters/database_cleaner-mongo/spec/database_cleaner/mongo/base_spec.rb

@@ -0,0 +1,8 @@
+require 'database_cleaner/mongo'
+
+RSpec.describe DatabaseCleaner::Mongo do
+  it "has a default_strategy of truncation" do
+    expect(described_class.default_strategy).to eq(:truncation)
+  end
+end
+

adapters/database_cleaner-mongo_mapper/lib/database_cleaner/mongo_mapper/base.rb

@@ -5,6 +5,10 @@ module DatabaseCleaner
       %w[truncation]
     end
 
+    def self.default_strategy
+      :truncation
+    end
+
     module Base
       include ::DatabaseCleaner::Generic::Base
 

adapters/database_cleaner-mongo_mapper/spec/database_cleaner/mongo_mapper/base_spec.rb

@@ -4,6 +4,10 @@ require 'database_cleaner/spec'
 module DatabaseCleaner
   RSpec.describe MongoMapper do
     it { is_expected.to respond_to(:available_strategies) }
+
+    it "has a default_strategy of truncation" do
+      expect(described_class.default_strategy).to eq(:truncation)
+    end
   end
 
   module MongoMapper

adapters/database_cleaner-mongoid/lib/database_cleaner/mongoid.rb

@@ -1,3 +1,10 @@
 require "database_cleaner/mongoid/version"
 require "database_cleaner"
 require "database_cleaner/mongoid/truncation"
+
+module DatabaseCleaner::Mongoid
+  def self.default_strategy
+    :truncation
+  end
+end
+

adapters/database_cleaner-mongoid/spec/database_cleaner/mongoid/base_spec.rb

@@ -0,0 +1,8 @@
+require 'database_cleaner/mongoid'
+
+RSpec.describe DatabaseCleaner::Mongoid do
+  it "has a default_strategy of truncation" do
+    expect(described_class.default_strategy).to eq(:truncation)
+  end
+end
+

adapters/database_cleaner-moped/lib/database_cleaner/moped.rb

@@ -2,3 +2,9 @@ require "database_cleaner/moped/version"
 require "database_cleaner"
 require "database_cleaner/moped/truncation"
 
+module DatabaseCleaner::Moped
+  def self.default_strategy
+    :truncation
+  end
+end
+

adapters/database_cleaner-moped/spec/database_cleaner/moped/base_spec.rb

@@ -0,0 +1,8 @@
+require 'database_cleaner/moped'
+
+RSpec.describe DatabaseCleaner::Moped do
+  it "has a default_strategy of truncation" do
+    expect(described_class.default_strategy).to eq(:truncation)
+  end
+end
+

adapters/database_cleaner-neo4j/lib/database_cleaner/neo4j/base.rb

@@ -5,6 +5,10 @@ module DatabaseCleaner
       %w[transaction truncation deletion]
     end
 
+    def self.default_strategy
+      :transaction
+    end
+
     module Base
       include ::DatabaseCleaner::Generic::Base
 

adapters/database_cleaner-neo4j/spec/database_cleaner/neo4j/base_spec.rb

@@ -4,6 +4,10 @@ require 'database_cleaner/spec'
 module DatabaseCleaner
   RSpec.describe Neo4j do
     it { is_expected.to respond_to(:available_strategies) }
+
+    it "has a default_strategy of transaction" do
+      expect(described_class.default_strategy).to eq(:transaction)
+    end
   end
 
   module Neo4j

adapters/database_cleaner-ohm/lib/database_cleaner/ohm.rb

@@ -2,3 +2,9 @@ require "database_cleaner/ohm/version"
 require "database_cleaner"
 require "database_cleaner/ohm/truncation"
 
+module DatabaseCleaner::Ohm
+  def self.default_strategy
+    :truncation
+  end
+end
+

adapters/database_cleaner-ohm/spec/database_cleaner/ohm/base_spec.rb

@@ -0,0 +1,8 @@
+require 'database_cleaner/ohm'
+
+RSpec.describe DatabaseCleaner::Ohm do
+  it "has a default_strategy of truncation" do
+    expect(described_class.default_strategy).to eq(:truncation)
+  end
+end
+

adapters/database_cleaner-redis/lib/database_cleaner/redis/base.rb

@@ -6,6 +6,10 @@ module DatabaseCleaner
       %w{truncation}
     end
 
+    def self.default_strategy
+      :truncation
+    end
+
     module Base
       include ::DatabaseCleaner::Generic::Base
 

adapters/database_cleaner-redis/spec/database_cleaner/redis/base_spec.rb

@@ -5,6 +5,10 @@ require 'database_cleaner/spec'
 module DatabaseCleaner
   RSpec.describe Redis do
     it { is_expected.to respond_to(:available_strategies) }
+
+    it "has a default_strategy of truncation" do
+      expect(described_class.default_strategy).to eq(:truncation)
+    end
   end
 
   module Redis

adapters/database_cleaner-sequel/lib/database_cleaner/sequel/base.rb

@@ -5,6 +5,10 @@ module DatabaseCleaner
       %w(truncation transaction deletion)
     end
 
+    def self.default_strategy
+      :transaction
+    end
+
     module Base
       include ::DatabaseCleaner::Generic::Base
 

adapters/database_cleaner-sequel/spec/database_cleaner/sequel/base_spec.rb

@@ -5,6 +5,10 @@ require 'sequel'
 module DatabaseCleaner
   RSpec.describe Sequel do
     it { is_expected.to respond_to(:available_strategies) }
+
+    it "has a default_strategy of transaction" do
+      expect(described_class.default_strategy).to eq(:transaction)
+    end
   end
 
   module Sequel

lib/database_cleaner/base.rb

@@ -15,7 +15,7 @@ module DatabaseCleaner
       @orm_autodetector = ORMAutodetector.new
       self.orm = desired_orm
       self.db = opts[:connection] || opts[:model] if opts.has_key?(:connection) || opts.has_key?(:model)
-      self.strategy = default_orm_strategy
+      self.strategy = orm_module && orm_module.default_strategy
       Safeguard.new.run
     end
 
@@ -103,6 +103,8 @@ module DatabaseCleaner
 
     def orm_module
       return unless [:active_record, :data_mapper, :mongo, :mongoid, :mongo_mapper, :moped, :couch_potato, :sequel, :ohm, :redis, :neo4j].include?(orm)
+      $LOAD_PATH.unshift File.expand_path("#{File.dirname(__FILE__)}/../../adapters/database_cleaner-#{orm}/lib")
+      require "database_cleaner/#{orm}"
       DatabaseCleaner.const_get(orm.to_s.camelize)
     end
 
@@ -118,19 +120,10 @@ module DatabaseCleaner
     end
 
     def require_orm_strategy(orm, strategy)
-      $LOAD_PATH.unshift File.expand_path("#{File.dirname(__FILE__)}/../../adapters/database_cleaner-#{orm}/lib/database_cleaner/#{orm}")
+      $LOAD_PATH.unshift File.expand_path("#{File.dirname(__FILE__)}/../../adapters/database_cleaner-#{orm}/lib")
       require "database_cleaner/#{orm}/#{strategy}"
     rescue LoadError
       raise UnknownStrategySpecified, "The '#{strategy}' strategy does not exist for the #{orm} ORM!  Available strategies: #{orm_module.available_strategies.join(', ')}"
     end
-
-    def default_orm_strategy
-      case orm
-      when :active_record, :data_mapper, :sequel, :neo4j
-        :transaction
-      when :mongo_mapper, :mongoid, :couch_potato, :moped, :ohm, :redis
-        :truncation
-      end
-    end
   end
 end