Redmine

i have been creating RFP plugin in redmine ,in this plug in contains a form which will filled by user .The form fields contains client requirement when user fill &submmited it the issues must generate in respective project.All form fields on form must become the issues my question is how each fiels i map with the redmine issue table and generate the respective issue

def new
        @rfp = Rfp.new   
        respond_to do |format|
        format.html # new.html.erb
            end
    end

def create
       params[:rfp].delete(:project_id)
       @rfp = Rfp.new(params[:rfp])
       issue = Issue.new
       issue.subject = params[:rfp]
       issue.tracker = Tracker.find_by_name("Feature")
       issue.project = Project.find_by_name(params[:project])
       issue.start_date = Time.now.localtime.strftime("%Y-%m-%d")
       issue.priority = IssuePriority.find_by_name("Normal")
       issue.author = User.find_by_mail("XXX@gmail.com")
       issue.status = IssueStatus.find_by_name("New")
       issue.save
       respond_to do |format|
       if @rfp.save
          format.html { redirect_to :action => "show", :id => @rfp }

else
       format.html { render "new" }

end
      end
      end

Here rfp is in th plugin object when i submitted the form it is successfully created but at the same time i want to create a new issue in redmine based on the value submmited in the form thats not happen any help