add dump_design_docs to CouchRest::Model::Utils:Migrate

This is similar to the migrations but instead of uploading the design
documents to couch it stores them in
  tmp/database/design.json
within the rails directory.

database is the supposed database name without prefixes or suffixes
design is the name of the design doc CouchRest model would have created

The files also contain a couchrest checksum so couchrest can detect they
are up to date.

This commit also cleans up a few redundant things in the extension to
CouchRest::Model:Utils::Migrate that we used to have. There's no need
to loop through the 'normal' models in load_all_models_with_engines
since load_all_models_without_engines already does that. We were also
overwriting all_models_and_proxies with exactly the same code as in
the original.

1 files changed, 26 insertions, 9 deletions

diff --git a/core/lib/extensions/couchrest.rb b/core/lib/extensions/couchrest.rb
index 91dfc1c..84cfbb3 100644
--- a/core/lib/extensions/couchrest.rb
+++ b/core/lib/extensions/couchrest.rb
@@ -47,28 +47,45 @@ module CouchRest
         def self.load_all_models_with_engines
           self.load_all_models_without_engines
           return unless defined?(Rails)
-          Dir[Rails.root + 'app/models/**/*.rb'].each do |path|
-            require path
-          end
           Dir[Rails.root + '*/app/models/**/*.rb'].each do |path|
             require path
           end
         end
 
-        def self.all_models_and_proxies
-          callbacks = migrate_each_model(find_models)
-          callbacks += migrate_each_proxying_model(find_proxying_models)
-          cleanup(callbacks)
+        class << self
+          alias_method_chain :load_all_models, :engines
+        end
+
+        def dump_all_models
+          prepare_directory
+          find_models.each do |model|
+            model.design_docs.each do |design|
+              dump_design(model, design)
+            end
+          end
         end
 
+        protected
 
+        def dump_design(model, design)
+          dir = prepare_directory model.name.tableize
+          filename = design.id.sub('_design/','') + '.json'
+          puts dir + filename
+          design.checksum
+          File.open(dir + filename, "w") do |file|
+            file.write(JSON.pretty_generate(design.to_hash))
+          end
+        end
 
-        class << self
-          alias_method_chain :load_all_models, :engines
+        def prepare_directory(dir = '')
+          dir = Rails.root + 'tmp' + 'designs' + dir
+          Dir.mkdir(dir) unless Dir.exists?(dir)
+          return dir
         end
 
       end
     end
+
   end
 
   class ModelRailtie