allow to configure definition path

fix #261

lib/generators/scenic/view/view_generator.rb

@@ -11,8 +11,8 @@ class ViewGenerator < Rails::Generators::NamedBase
       source_root File.expand_path("templates", __dir__)
 
       def create_views_directory
-        unless views_directory_path.exist?
-          empty_directory(views_directory_path)
+        unless Scenic.configuration.definitions_path.exist?
+          empty_directory(Scenic.configuration.definitions_path)
         end
       end
 
@@ -44,10 +44,7 @@ def self.next_migration_number(dir)
 
       no_tasks do
         def previous_version
-          @previous_version ||=
-            Dir.entries(views_directory_path)
-              .map { |name| version_regex.match(name).try(:[], "version").to_i }
-              .max
+          @previous_version ||= previous_definition.version
         end
 
         def version
@@ -73,30 +70,20 @@ def activerecord_migration_class
 
       private
 
-      alias singular_name file_name
-
-      def file_name
-        super.tr(".", "_")
-      end
-
-      def views_directory_path
-        @views_directory_path ||= Rails.root.join("db", "views")
-      end
-
-      def version_regex
-        /\A#{plural_file_name}_v(?<version>\d+)\.sql\z/
+      def definitions
+        @definitions ||= Scenic::Definitions.new(plural_file_name)
       end
 
       def creating_new_view?
-        previous_version.zero?
+        definitions.none?
       end
 
       def definition
         Scenic::Definition.new(plural_file_name, version)
       end
 
       def previous_definition
-        Scenic::Definition.new(plural_file_name, previous_version)
+        definitions.max || Scenic::Definition.new(plural_file_name, 0)
       end
 
       def destroying?

lib/scenic/configuration.rb

@@ -1,14 +1,18 @@
 module Scenic
   class Configuration
+    include ActiveSupport::Configurable
+
     # The Scenic database adapter instance to use when executing SQL.
     #
     # Defaults to an instance of {Adapters::Postgres}
     # @return Scenic adapter
-    attr_accessor :database
+    config_accessor(:database) { Scenic::Adapters::Postgres.new }
 
-    def initialize
-      @database = Scenic::Adapters::Postgres.new
-    end
+    # The path where is stored views definition sql files.
+    #
+    # Defaults to an instance of {Pathname} to rails_root/db/views
+    # @return the path
+    config_accessor(:definitions_path) { Rails.root.join("db", "views") }
   end
 
   # @return [Scenic::Configuration] Scenic's current configuration

lib/scenic/definition.rb

@@ -15,11 +15,11 @@ def to_sql
     end
 
     def full_path
-      Rails.root.join(path)
+      Scenic.configuration.definitions_path.join(filename)
     end
 
     def path
-      File.join("db", "views", filename)
+      Scenic.configuration.definitions_path.relative_path_from(Rails.root)
     end
 
     def version

lib/scenic/definitions.rb

@@ -0,0 +1,36 @@
+module Scenic
+  # @api private
+  class Definitions
+    include Enumerable
+    include Comparable
+
+    attr_reader :name, :views_directory_path
+
+    def initialize(name)
+      @name = name
+    end
+
+    def each
+      versions.each do |version|
+        yield Scenic::Definition.new(plural_file_name, version)
+      end
+    end
+
+    def <=>(a, b)
+      a.version <=> b.version
+    end
+
+    def versions
+      @versions ||= Dir.entries(Scenic.configuration.definitions_path)
+        .map { |name| version_regex.match(name).try(:[], "version").try(:to_i) }
+        .compact
+        .sort
+    end
+
+    private
+
+    def version_regex
+      /\A#{name}_v(?<version>\d+)\.sql\z/
+    end
+  end
+end