WIP- a better approach to #72 making the it clear that the DB was unspecified

For some reason DataMapper does not like these changes.. I'm also unsure
how to handle the Sequel part since it has some different logic
concerning this.  Rethinking how DBCleaner handles this type of
situation would be beneficial..

lib/database_cleaner/base.rb

@@ -20,13 +20,13 @@ module DatabaseCleaner
     def strategy_db=(desired_db)
       if strategy.respond_to? :db=
         strategy.db = desired_db
-      elsif desired_db!= :default
-        raise ArgumentError, "You must provide a strategy object that supports non default databases when you specify a database"
+      elsif desired_db != :unspecified
+        raise ArgumentError, "The #{strategy.class} strategy does not allow you to specify a database. Use a different strategy or remove the database specification."
       end
     end
 
     def db
-      @db || :default
+      @db || :unspecified
     end
 
     def create_strategy(*args)

lib/database_cleaner/configuration.rb

@@ -4,6 +4,7 @@ module DatabaseCleaner
 
   class NoORMDetected < StandardError;   end
   class UnknownStrategySpecified < ArgumentError;   end
+  class UnspecifiedDatabase < ArgumentError;   end
 
   class << self
     def [](orm,opts = {})

lib/database_cleaner/data_mapper/base.rb

@@ -7,15 +7,7 @@ module DatabaseCleaner
 
     module Base
       include ::DatabaseCleaner::Generic::Base
-
-      def db=(desired_db)
-        @db = desired_db
-      end
-
-      def db
-        @db || :default
-      end
-
+      include ::DatabaseCleaner::Generic::ConfigurableDB
     end
   end
 end

lib/database_cleaner/generic/base.rb

@@ -1,13 +1,22 @@
 module ::DatabaseCleaner
-   module Generic
-     module Base
+  module Generic
+    module ConfigurableDB
+      def db=(desired_db)
+        @db = desired_db
+      end
 
+      def db
+        @db || :unspecified
+      end
+    end
+
+     module Base
        def self.included(base)
          base.extend(ClassMethods)
        end
 
        def db
-         :default
+         :unspecified
        end
 
        module ClassMethods

lib/database_cleaner/mongo_mapper/base.rb

@@ -7,14 +7,7 @@ module DatabaseCleaner
 
     module Base
       include ::DatabaseCleaner::Generic::Base
-
-      def db=(desired_db)
-        @db = desired_db
-      end
-
-      def db
-        @db || :default
-      end
+      include ::DatabaseCleaner::Generic::ConfigurableDB
     end
   end
 end

lib/database_cleaner/mongoid/base.rb

@@ -7,14 +7,7 @@ module DatabaseCleaner
 
     module Base
       include ::DatabaseCleaner::Generic::Base
-
-      def db=(desired_db)
-        @db = desired_db
-      end
-
-      def db
-        @db || :default
-      end
+      include ::DatabaseCleaner::Generic::ConfigurableDB
     end
   end
 end

lib/database_cleaner/sequel/base.rb

@@ -13,9 +13,11 @@ module DatabaseCleaner
       end
 
       def db
-        return @db if @db && @db != :default
-        raise "As you have more than one active sequel database you have to specify the one to use manually!" if ::Sequel::DATABASES.count > 1 
-        ::Sequel::DATABASES.first || :default
+        return @db if @db && @db != :unspecified
+        if ::Sequel::DATABASES.count > 1
+          raise ::DatabaseCleaner::UnspecifiedDatabase, "You have more than one active sequel database. You must specify which one to use!"
+        end
+        ::Sequel::DATABASES.first || :unspecified
       end
     end
   end

spec/database_cleaner/active_record/base_spec.rb

@@ -34,19 +34,14 @@ module DatabaseCleaner
       it_should_behave_like "a generic strategy"
 
       describe "db" do
-        it { should respond_to(:db=) }
+        before(:each) { subject.stub(:load_config)}
+        it_should_behave_like "a strategy with configurable db"
 
         it "should store my desired db" do
-          subject.stub(:load_config)
-
           subject.db = :my_db
           subject.db.should == :my_db
         end
 
-        it "should default to :default" do
-          subject.db.should == :default
-        end
-
         it "should load_config when I set db" do
           subject.should_receive(:load_config)
           subject.db = :my_db
@@ -54,9 +49,6 @@ module DatabaseCleaner
       end
 
       describe "load_config" do
-
-        it { should respond_to(:load_config) }
-
         before do
           yaml = <<-Y
 my_db:

spec/database_cleaner/base_spec.rb

@@ -128,12 +128,12 @@ module DatabaseCleaner
 
     describe "comparison" do
       it "should be equal if orm, connection and strategy are the same" do
-        strategy = mock("strategy")
+        strategy = mock("strategy", {:db= => nil})
 
-        one = DatabaseCleaner::Base.new(:active_record,:connection => :default)
+        one = DatabaseCleaner::Base.new(:active_record,:connection => :foo)
         one.strategy = strategy
 
-        two = DatabaseCleaner::Base.new(:active_record,:connection => :default)
+        two = DatabaseCleaner::Base.new(:active_record,:connection => :foo)
         two.strategy = strategy
 
         one.should == two
@@ -178,8 +178,8 @@ module DatabaseCleaner
     end
 
     describe "db" do
-      it "should default to :default" do
-        subject.db.should == :default
+      it "should default to :unspecified" do
+        subject.db.should == :unspecified
       end
 
       it "should return any stored db value" do
@@ -219,14 +219,7 @@ module DatabaseCleaner
       context "when strategy doesn't supports db specification" do
         before(:each) { strategy.stub(:respond_to?).with(:db=).and_return false }
 
-        it "should check to see if db is :default" do
-          db = mock("default")
-          db.should_receive(:==).with(:default).and_return(true)
-
-          subject.strategy_db = db
-        end
-
-        it "should raise an argument error when db isn't default" do
+        it "raises an error when db isn't default" do
           db = mock("a db")
           expect{ subject.strategy_db = db }.to raise_error ArgumentError
         end

spec/database_cleaner/data_mapper/base_spec.rb

@@ -14,17 +14,7 @@ module DatabaseCleaner
 
     describe ExampleStrategy do
       it_should_behave_like "a generic strategy"
-      it { should respond_to(:db)  }
-      it { should respond_to(:db=) }
-
-      it "should store my desired db" do
-        subject.db = :my_db
-        subject.db.should == :my_db
-      end
-
-      it "should default to :default" do
-        subject.db.should == :default
-      end
+      it_should_behave_like "a strategy with configurable db"
     end
   end
 end

spec/database_cleaner/generic/base_spec.rb

@@ -15,8 +15,7 @@ module ::DatabaseCleaner
       end
 
       it_should_behave_like "a generic strategy"
-
-      its(:db) { should == :default }
+      its(:db) { should == :unspecified }
     end
   end
 end

spec/database_cleaner/mongo_mapper/base_spec.rb

@@ -13,21 +13,8 @@ module DatabaseCleaner
     end
 
     describe ExampleStrategy do
-
       it_should_behave_like "a generic strategy"
-
-      describe "db" do
-        it { should respond_to(:db=) }
-
-        it "should store my desired db" do
-          subject.db = :my_db
-          subject.db.should == :my_db
-        end
-
-        it "should default to :default" do
-          subject.db.should == :default
-        end
-      end
+      it_should_behave_like "a strategy with configurable db"
     end
   end
 end

spec/database_cleaner/sequel/base_spec.rb

@@ -15,17 +15,6 @@ module DatabaseCleaner
 
     describe ExampleStrategy do
       it_should_behave_like "a generic strategy"
-      it { should respond_to(:db)  }
-      it { should respond_to(:db=) }
-
-      it "should store my desired db" do
-        subject.db = :my_db
-        subject.db.should == :my_db
-      end
-
-      it "should default to :default" do
-        subject.db.should == :default
-      end
     end
   end
 end

spec/database_cleaner/shared_strategy_spec.rb

@@ -2,6 +2,18 @@ shared_examples_for "a generic strategy" do
   it { should respond_to(:db)  }
 end
 
+shared_examples_for "a strategy with configurable db" do
+  it "stores the desired db" do
+    subject.db = :my_db
+    subject.db.should == :my_db
+  end
+
+  it "defaults #db to :unspecified" do
+    subject.db.should == :unspecified
+  end
+end
+
+
 shared_examples_for "a generic truncation strategy" do
   it { should respond_to(:start) }
   it { should respond_to(:clean) }