Started the refactoring work on couchrest.

* A server can have multiple defined available databases set to be used by documents (think DM repos)
* A server can have a default database so documents can easily share the same db connection
* Let a document class have a default database to use
* Give access to a document uri
* extracted some of the document features to a mixin

lib/couchrest.rb

@@ -37,6 +37,8 @@ module CouchRest
   autoload :FileManager,  'couchrest/helper/file_manager'
   autoload :Streamer,     'couchrest/helper/streamer'
   
+  require File.join(File.dirname(__FILE__), 'couchrest', 'mixins')
+  
   # The CouchRest module methods handle the basic JSON serialization 
   # and deserialization, as well as query parameters. The module also includes
   # some helpers for tasks like instantiating a new Database or Server instance.

lib/couchrest/core/document.rb

@@ -14,62 +14,39 @@ module CouchRest
   end
   
   class Document < Response
+    include CouchRest::Mixins::Views
 
     attr_accessor :database
+    @@database = nil
     
-    # alias for self['_id']
+    # override the CouchRest::Model-wide default_database
-    def id
+    # This is not a thread safe operation, do not change the model
-      self['_id']
+    # database at runtime.
+    def self.use_database(db)
+      @@database = db
     end
     
-    # alias for self['_rev']      
+    def self.database
-    def rev
+      @@database
-      self['_rev']
     end
     
-    # returns true if the document has never been saved
+    # Returns the CouchDB uri for the document
-    def new_document?
+    def uri(append_rev = false)
-      !rev
+      return nil if new_document?
+      couch_uri = "http://#{database.uri}/#{CGI.escape(id)}"
+      if append_rev == true
+        couch_uri << "?rev=#{rev}"
+      elsif append_rev.kind_of?(Integer)
+        couch_uri << "?rev=#{append_rev}"
+      end
+      couch_uri
     end
     
-    # Saves the document to the db using create or update. Also runs the :save
+    # Returns the document's database
-    # callbacks. Sets the <tt>_id</tt> and <tt>_rev</tt> fields based on
+    def database
-    # CouchDB's response.
+      @database || self.class.database
-    # If <tt>bulk</tt> is <tt>true</tt> (defaults to false) the document is cached for bulk save.
-    def save(bulk = false)
-      raise ArgumentError, "doc.database required for saving" unless database
-      result = database.save_doc self, bulk
-      result['ok']
-    end
-
-    # Deletes the document from the database. Runs the :delete callbacks.
-    # Removes the <tt>_id</tt> and <tt>_rev</tt> fields, preparing the
-    # document to be saved to a new <tt>_id</tt>.
-    # If <tt>bulk</tt> is <tt>true</tt> (defaults to false) the document won't 
-    # actually be deleted from the db until bulk save.
-    def destroy(bulk = false)
-      raise ArgumentError, "doc.database required to destroy" unless database
-      result = database.delete_doc(self, bulk)
-      if result['ok']
-        self['_rev'] = nil
-        self['_id'] = nil
-      end
-      result['ok']
-    end
-    
-    def copy(dest)
-      raise ArgumentError, "doc.database required to copy" unless database
-      result = database.copy_doc(self, dest)
-      result['ok']
-    end
-    
-    def move(dest)
-      raise ArgumentError, "doc.database required to copy" unless database
-      result = database.move_doc(self, dest)
-      result['ok']
     end
 
   end
   
-  
 end

lib/couchrest/core/server.rb

@@ -1,25 +1,62 @@
 module CouchRest
   class Server
-    attr_accessor :uri, :uuid_batch_count
+    attr_accessor :uri, :uuid_batch_count, :available_databases
-    def initialize server = 'http://127.0.0.1:5984', uuid_batch_count = 1000
+    def initialize(server = 'http://127.0.0.1:5984', uuid_batch_count = 1000)
       @uri = server
       @uuid_batch_count = uuid_batch_count
     end
   
-    # List all databases on the server
+    # Lists all "available" databases.
+    # An available database, is a database that was specified
+    # as avaiable by your code.
+    # It allows to define common databases to use and reuse in your code
+    def available_databases
+      @available_databases ||= {}
+    end
+    
+    # Adds a new available database and create it unless it already exists
+    #
+    # Example:
+    #
+    # @couch = CouchRest::Server.new
+    # @couch.define_available_database(:default, "tech-blog")
+    #
+    def define_available_database(reference, db_name, create_unless_exists = true)
+      available_databases[reference.to_sym] = create_unless_exists ? database!(db_name) : database(db_name)
+    end
+  
+    # Checks that a database is set as available
+    #
+    # Example:
+    #
+    # @couch.available_database?(:default)
+    #
+    def available_database?(ref_or_name)
+      ref_or_name.is_a?(Symbol) ? available_databases.keys.include?(ref_or_name) : available_databases.values.map{|db| db.name}.include?(ref_or_name)
+    end
+  
+    def default_database=(name, create_unless_exists = true)
+      define_available_database(:default, name, create_unless_exists = true)
+    end
+    
+    def default_database
+      available_databases[:default]
+    end
+  
+    # Lists all databases on the server
     def databases
       CouchRest.get "#{@uri}/_all_dbs"
     end
   
     # Returns a CouchRest::Database for the given name
-    def database name
+    def database(name)
       CouchRest::Database.new(self, name)
     end
   
     # Creates the database if it doesn't exist
-    def database! name
+    def database!(name)
       create_db(name) rescue nil
-      database name
+      database(name)
     end
   
     # GET the welcome message
@@ -28,9 +65,9 @@ module CouchRest
     end
 
     # Create a database
-    def create_db name
+    def create_db(name)
       CouchRest.put "#{@uri}/#{name}"
-      database name
+      database(name)
     end
 
     # Restart the CouchDB instance
@@ -39,7 +76,7 @@ module CouchRest
     end
 
     # Retrive an unused UUID from CouchDB. Server instances manage caching a list of unused UUIDs.
-    def next_uuid count = @uuid_batch_count
+    def next_uuid(count = @uuid_batch_count)
       @uuids ||= []
       if @uuids.empty?
         @uuids = CouchRest.post("#{@uri}/_uuids?count=#{count}")["uuids"]

lib/couchrest/mixins.rb

@@ -0,0 +1,3 @@
+mixins_dir = File.join(File.dirname(__FILE__), 'mixins')
+
+require File.join(mixins_dir, 'views')

lib/couchrest/mixins/views.rb

@@ -0,0 +1,59 @@
+module CouchRest
+  module Mixins
+    module Views
+    
+      # alias for self['_id']
+      def id
+        self['_id']
+      end
+
+      # alias for self['_rev']      
+      def rev
+        self['_rev']
+      end
+
+      # returns true if the document has never been saved
+      def new_document?
+        !rev
+      end
+    
+      # Saves the document to the db using create or update. Also runs the :save
+      # callbacks. Sets the <tt>_id</tt> and <tt>_rev</tt> fields based on
+      # CouchDB's response.
+      # If <tt>bulk</tt> is <tt>true</tt> (defaults to false) the document is cached for bulk save.
+      def save(bulk = false)
+        raise ArgumentError, "doc.database required for saving" unless database
+        result = database.save_doc self, bulk
+        result['ok']
+      end
+
+      # Deletes the document from the database. Runs the :delete callbacks.
+      # Removes the <tt>_id</tt> and <tt>_rev</tt> fields, preparing the
+      # document to be saved to a new <tt>_id</tt>.
+      # If <tt>bulk</tt> is <tt>true</tt> (defaults to false) the document won't 
+      # actually be deleted from the db until bulk save.
+      def destroy(bulk = false)
+        raise ArgumentError, "doc.database required to destroy" unless database
+        result = database.delete_doc(self, bulk)
+        if result['ok']
+          self['_rev'] = nil
+          self['_id'] = nil
+        end
+        result['ok']
+      end
+    
+      def copy(dest)
+        raise ArgumentError, "doc.database required to copy" unless database
+        result = database.copy_doc(self, dest)
+        result['ok']
+      end
+    
+      def move(dest)
+        raise ArgumentError, "doc.database required to copy" unless database
+        result = database.move_doc(self, dest)
+        result['ok']
+      end
+    
+    end
+  end
+end

spec/couchrest/core/document_spec.rb

@@ -1,6 +1,15 @@
 require File.dirname(__FILE__) + '/../../spec_helper'
 
-describe CouchRest::Document, "[]=" do
+class Video < CouchRest::Document; end
+
+describe CouchRest::Document do
+  
+  before(:all) do
+    @couch = CouchRest.new
+    @db    = @couch.database!(TESTDB)
+  end
+
+  describe "[]=" do
     before(:each) do
       @doc = CouchRest::Document.new
     end
@@ -20,7 +29,25 @@ describe CouchRest::Document, "[]=" do
     end
   end
 
-describe CouchRest::Document, "new" do
+  describe  "default database" do
+    it "should be set using use_database on the model" do
+      Video.new.database.should be_nil
+      Video.use_database @db
+      Video.new.database.should == @db
+      Video.use_database nil
+    end
+    
+    it "should be overwritten by instance" do
+      db = @couch.database('test')
+      article = Video.new
+      article.database.should be_nil
+      article.database = db
+      article.database.should_not be_nil
+      article.database.should == db
+    end
+  end
+
+  describe  "new" do
     before(:each) do
       @doc = CouchRest::Document.new("key" => [1,2,3], :more => "values")    
     end
@@ -38,7 +65,7 @@ describe CouchRest::Document, "new" do
   end
 
   # move to database spec
-describe CouchRest::Document, "saving using a database" do
+  describe  "saving using a database" do
     before(:all) do
       @doc = CouchRest::Document.new("key" => [1,2,3], :more => "values")    
       @db = reset_test_db!    
@@ -53,7 +80,7 @@ describe CouchRest::Document, "saving using a database" do
     end
   end
 
-describe CouchRest::Document, "bulk saving" do
+  describe  "bulk saving" do
     before :all do
       @db = reset_test_db!
     end
@@ -211,3 +238,4 @@ describe "MOVE existing document" do
       end
     end
   end
+end

spec/couchrest/core/server_spec.rb

@@ -0,0 +1,34 @@
+require File.dirname(__FILE__) + '/../../spec_helper'
+
+describe CouchRest::Server do
+  
+  before(:all) do
+    @couch = CouchRest::Server.new
+  end
+  
+  after(:all) do
+    @couch.available_databases.each do |ref, db|
+      db.delete!
+    end
+  end
+  
+  describe "available databases" do
+    it "should let you add more databases" do
+      @couch.available_databases.should be_empty
+      @couch.define_available_database(:default, "cr-server-test-db")
+      @couch.available_databases.keys.should include(:default)
+    end
+    
+    it "should verify that a database is available" do
+      @couch.available_database?(:default).should be_true
+      @couch.available_database?("cr-server-test-db").should be_true
+      @couch.available_database?(:matt).should be_false
+    end
+    
+    it "should let you set a default database" do
+      @couch.default_database = 'cr-server-test-default-db'
+      @couch.available_database?(:default).should be_true
+    end
+  end
+  
+end