Redmine

In the end of show.api.rsb I have added and it seems to work:

api.array :members do
    @project.members.each do |member|
      api.member(:id => member.id, :name => member.name, :user => member.user_id)
    end
  end if include_in_api_response?('members') 

I have improved it a little bit:

 api.array :members do
    @project.members.each do |member|     
      member.roles do |role|
        api.role(:role => role.id)
      end
      api.member(:id => member.id, :name => member.name, :user => member.user_id, :login => member.user.login, :mail => member.user.mail, :roles => member.roles)
    end 
  end if include_in_api_response?('members') 

  api.array :memberroles do     
    @users_by_role.keys.sort.each do |role|     
      api.memberroles(:id => role.id, :name => role.name, :users => @users_by_role[role].sort)
    end 
  end if include_in_api_response?('memberroles') 

  api.array :roles do     
    @users_by_role.keys.sort.each do |role|
      api.roles(:id => role.id, :name => role.name)      
    end 
  end if include_in_api_response?('roles') 

This is unrelated to this issue. How do I create a new project in this system?

Edward Robson Subraman: you can create a new project by making POST request, as it described here:
http://www.redmine.org/projects/redmine/wiki/Rest_Projects