1 files changed, 20 insertions, 16 deletions
diff --git a/activerecord/lib/active_record/database_configurations/url_config.rb b/activerecord/lib/active_record/database_configurations/url_config.rb
index 81917fc4c1..e6b4acc647 100644
--- a/activerecord/lib/active_record/database_configurations/url_config.rb
+++ b/activerecord/lib/active_record/database_configurations/url_config.rb
@@ -17,17 +17,17 @@ module ActiveRecord
     #     @config={"adapter"=>"postgresql", "database"=>"foo", "host"=>"localhost"},
     #     @url="postgres://localhost/foo">
     #
-    # Options are:
+    # ==== Options
     #
-    # <tt>:env_name</tt> - The Rails environment, ie "development"
-    # <tt>:spec_name</tt> - The specification name. In a standard two-tier
-    # database configuration this will default to "primary". In a multiple
-    # database three-tier database configuration this corresponds to the name
-    # used in the second tier, for example "primary_readonly".
-    # <tt>:url</tt> - The database URL.
-    # <tt>:config</tt> - The config hash. This is the hash that contains the
-    # database adapter, name, and other important information for database
-    # connections.
+    # * <tt>:env_name</tt> - The Rails environment, ie "development".
+    # * <tt>:spec_name</tt> - The specification name. In a standard two-tier
+    #   database configuration this will default to "primary". In a multiple
+    #   database three-tier database configuration this corresponds to the name
+    #   used in the second tier, for example "primary_readonly".
+    # * <tt>:url</tt> - The database URL.
+    # * <tt>:config</tt> - The config hash. This is the hash that contains the
+    #   database adapter, name, and other important information for database
+    #   connections.
     class UrlConfig < DatabaseConfig
       attr_reader :url, :config
 
@@ -42,26 +42,30 @@ module ActiveRecord
       end
 
       # Determines whether a database configuration is for a replica / readonly
-      # connection. If the `replica` key is present in the config, `replica?` will
+      # connection. If the +replica+ key is present in the config, +replica?+ will
       # return +true+.
       def replica?
         config["replica"]
       end
 
       # The migrations paths for a database configuration. If the
-      # `migrations_paths` key is present in the config, `migrations_paths`
+      # +migrations_paths+ key is present in the config, +migrations_paths+
       # will return its value.
       def migrations_paths
         config["migrations_paths"]
       end
 
       private
-        def build_config(original_config, url)
-          if /^jdbc:/.match?(url)
-            hash = { "url" => url }
+        def build_url_hash(url)
+          if url.nil? || /^jdbc:/.match?(url)
+            { "url" => url }
           else
-            hash = ActiveRecord::ConnectionAdapters::ConnectionSpecification::ConnectionUrlResolver.new(url).to_hash
+            ActiveRecord::ConnectionAdapters::ConnectionSpecification::ConnectionUrlResolver.new(url).to_hash
           end
+        end
+
+        def build_config(original_config, url)
+          hash = build_url_hash(url)
 
           if original_config[env_name]
             original_config[env_name].merge(hash)