result.rb in synchronised_migration-3.0.0

- old
+ new

@@ -1,21 +1,52 @@
-require 'synchronised_migration'
+require "synchronised_migration"
 
-class SynchronisedMigration::Result
-  attr_accessor :error
+module SynchronisedMigration
+  MIGRATION_SUCCESS = 0
+  PREVIOUS_SUCCESS = 1
+  PREVIOUS_FAILED = 2
+  MIGRATION_FAILED = 3
 
-  def initialize(error = nil)
-    @error = error
-  end
+  PREVIOUS_FAILED_MSG = "Halting the script because the previous migration failed."
+  MIGRATION_FAILED_MSG = "Migration command failed."
 
-  def success?
-    error.nil?
-  end
+  class Result
+    attr_reader :code
 
-  def self.ok
-    self.new
-  end
+    def initialize(code)
+      @code = code
+    end
 
-  def self.fail(error)
-    self.new error
+    def successful?
+      [MIGRATION_SUCCESS, PREVIOUS_SUCCESS].include?(code)
+    end
+
+    def failure?
+      !successful?
+    end
+
+    def error_msg
+      case code
+      when MIGRATION_FAILED
+        MIGRATION_FAILED_MSG
+      when PREVIOUS_FAILED
+        PREVIOUS_FAILED_MSG
+      end
+    end
+
+    def self.ok
+      new(MIGRATION_SUCCESS)
+    end
+
+    def self.migration_already_completed
+      new(PREVIOUS_SUCCESS)
+    end
+
+    def self.previous_migration_failed
+      new(PREVIOUS_FAILED)
+    end
+
+    def self.migration_failed
+      new(MIGRATION_FAILED)
+    end
   end
 end