Added migration(s) generator

lib/generators/USAGE

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+Description:
+    Generates the appropriate database migration to add i18n fields
+
+Example:
+    rails generate has_foreign_language <language> [Model]
+
+    This will create:
+        db/migrate/yyyyMMddssssss_add_foreign_language_<language>_to_<model>.rb

lib/generators/has_foreign_language_generator.rb

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+class HasForeignLanguageGenerator < Rails::Generators::Base
+  source_root File.expand_path('../templates', __FILE__)
+  argument :lang, :type => :string, :optional => false, :desc => 'Language identifier'
+  argument :name, :type => :string, :optional => true, :desc => 'Model name'
+
+  def generate_migration
+    if list_of_models.size > 0
+      template "migration.rb", "db/migrate/#{Time.now.strftime('%Y%m%d%H%M%S')}_#{migration_name.underscore}.rb"
+    else
+      puts "No need to migrate!"
+    end
+  end
+
+  private
+
+  def list_of_models(force = false)
+    all_models = Dir.glob( File.join( Rails.root, 'app', 'models', '*.rb') ).map { |path| path[/.+\/(.+).rb/,1] }
+    all_models = all_models.select { |m| m.classify == name } if !name.blank?
+    ar_models = all_models.select { |m| m.classify.constantize < ActiveRecord::Base }
+    ar_models = ar_models.select { |m| list_of_columns(m, force).length > 0 }
+    ar_models
+  end
+
+  def list_of_columns(model, force = false, log = false)
+    c = []
+    k = model.classify.constantize
+    k.instance_methods(false).each do |m|
+      if m.to_s.match("^has_foreign_language_(.+)\\?$")
+        if !k.columns_hash[$1].nil?
+          c << k.columns_hash[$1] if !k.columns_hash.has_key? "#{$1}_#{lang.downcase}" || force
+        else
+          puts "Warning: #{k}##{$1} has not been migrated!" if log
+        end
+      end
+    end
+    c
+  end
+
+  def migration_name
+    "AddForeignLanguage#{lang.capitalize}To#{list_of_models.map { |m| m.classify }.join('And')}".slice(0, 127)
+  end
+end

lib/generators/templates/migration.rb

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+class <%= migration_name %> < ActiveRecord::Migration
+  
+<% list_of_models.each do |model| -%>
+  class <%= model.classify %> < ActiveRecord::Base
+  end
+<% end -%>
+
+  def self.up
+<% list_of_models.each do |model| -%>
+    change_table(:<%= model.classify.constantize.table_name %>) do |t|
+<% list_of_columns(model, false, true).each do |c| -%>
+       t.<%= c.type %> :<%= "#{c.name}_#{lang}" %><%= ", :null => #{c.null}" %><%= ", :default => '#{c.default}'" unless c.default.blank? %><%= ", :limit => #{c.limit}" unless c.limit.blank? %><%= ", :sql_type => '#{c.sql_type}'" unless c.sql_type.blank? %><%= ", :precision => #{c.precision}" unless c.precision.blank? %><%= ", :scale => #{c.scale}" unless c.scale.blank? %>
+<% end -%>
+    end
+<% end -%>
+end
+
+  def self.down
+<% list_of_models.each do |model| -%>
+<% list_of_columns(model, false).each do |c| -%>
+    remove_column :<%= model.classify.constantize.table_name %>, :<%= "#{c.name}_#{lang}" %>
+<% end -%><% end -%>
+  end
+end