Drop driver getter from database

spec/custom_drivers_types_spec.cr

@@ -160,8 +160,8 @@ DB.register_driver "bar", BarDriver
 
 describe DB do
   it "should be able to register multiple drivers" do
-    DB.open("foo://host").driver.should be_a(FooDriver)
-    DB.open("bar://host").driver.should be_a(BarDriver)
+    DB.open("foo://host").checkout.should be_a(FooDriver::FooConnection)
+    DB.open("bar://host").checkout.should be_a(BarDriver::BarConnection)
   end
 
   it "Foo and Bar drivers should return fake_row" do

spec/db_spec.cr

@@ -9,12 +9,9 @@ describe DB do
     DB.driver_class("dummy").should eq(DummyDriver)
   end
 
-  it "should instantiate driver with connection uri" do
+  it "should create dummy connection" do
     db = DB.open "dummy://localhost:1027"
-    db.driver.should be_a(DummyDriver)
-    db.uri.scheme.should eq("dummy")
-    db.uri.host.should eq("localhost")
-    db.uri.port.should eq(1027)
+    db.checkout.should be_a(DummyDriver::DummyConnection)
   end
 
   it "should create a connection and close it" do

src/db/database.cr

@@ -31,8 +31,6 @@ module DB
     include SessionMethods(Database, PoolStatement)
     include ConnectionContext
 
-    # :nodoc:
-    getter driver
     # :nodoc:
     getter pool
 
@@ -45,13 +43,13 @@ module DB
     @statements_cache = StringKeyCache(PoolPreparedStatement).new
 
     # :nodoc:
-    def initialize(@driver : Driver, @uri : URI)
+    def initialize(driver : Driver, @uri : URI)
       params = HTTP::Params.parse(uri.query || "")
-      @connection_options = @driver.connection_options(params)
-      pool_options = @driver.pool_options(params)
+      @connection_options = driver.connection_options(params)
+      pool_options = driver.pool_options(params)
 
       @setup_connection = ->(conn : Connection) {}
-      factory = @driver.connection_builder(@uri)
+      factory = driver.connection_builder(@uri)
       @pool = uninitialized Pool(Connection) # in order to use self in the factory proc
       @pool = Pool.new(pool_options) {
         conn = factory.call