couchrest_0.8_to_0.9_changes_shim.rb

# My monkey patch to couchrest to make it work transparently 
# with couchdb 0.8, the version currently in debian and ubuntu.
#
#----making couchrest view 0.8 friendly----

#autoloading for monkey patching
CouchRest::Server
CouchRest::Database

module CouchRest

  class Server
    def version
      @version ||=CouchRest.get("#{@uri}/")['version']
    end
    def version_0_8?
      version.include? '0.8'
    end
  end

  class Database
    
    def view_url dname,vname
      if server.version_0_8?
        "#{@root}/_view/#{dname}/#{vname}"
      else
        "#{@root}/_design/#{dname}/_view/#{vname}"
      end
    end
    
    # Query a CouchDB view as defined by a <tt>_design</tt> document. Accepts
    # paramaters as described in http://wiki.apache.org/couchdb/HttpViewApi
    def view(name, params = {}, &block)
      
      if server.version_0_8? && limit = params.delete(:limit)
        params[:count] = limit
      end
      
      keys = params.delete(:keys)
      name = name.split('/') # I think this will always be length == 2, but maybe not...
      dname = name.shift
      vname = name.join('/')
      url = CouchRest.paramify_url view_url(dname,vname) , params
      if keys
        CouchRest.post(url, {:keys => keys})
      else
        if block_given?
          @streamer.view(view_url(dname,vname), params, &block)
        else
          CouchRest.get url
        end
      end
    end
  end
end