Rails submit create action succeeding

I am learning ruby rails and i have a #create problem (i think)

when i am creating a new "stat" with form_for, once i press submit i get redirect to index.html.erb (as written in my controller) but there is no data apart from the id (even if i chose my self an id, it get generated by rails)

the weird part is, if i edit the new entry (where everything is blank but :ID) data are saved.

I hope i am clear enough it's my first question on stackoverflow

Thx a lot !

My controller : stats

def new
    @stat = Stat.new
end 

def create
    @stat = Stat.new
    if @stat.save 
      redirect_to "/stats" 
      flash[:notice] = "work"
    else 
      render "new"
      flash[:notice] = "didn't work"
    end 
end 

the log for create action

tarted POST "/stats" for 92.133.16.18 at 2015-06-09 12:09:11 +0000
Processing by StatsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"bCV+ymN4NxuMM6441OLaRyu/cuLXIcX5fu1g/rG+gqg=", "stat"=>{"id"=>"", "cc"=>"ok", "ct"=>"ok", "force"=>"ok", "endurance"=>"ok", "blessure"=>"ok", "init"=>"ok", "attaque"=>"ok", "ld"=>"ok", "sv"=>"ok"}, "commit"=>"Save"}
   (0.1ms)  begin transaction
  SQL (0.3ms)  INSERT INTO "stats" ("created_at", "updated_at") VALUES (?, ?)  [["created_at", "2015-06-09 12:09:11.561787"], ["updated_at", "2015-06-09 12:09:11.561787"]]
   (10.8ms)  commit transaction
Redirected to http://ift.tt/1MkPB8l
Completed 302 Found in 16ms (ActiveRecord: 11.2ms)

the log for the update action

Started PATCH "/stats/11" for 92.133.16.18 at 2015-06-09 12:04:09 +0000
Processing by StatsController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"bCV+ymN4NxuMM6441OLaRyu/cuLXIcX5fu1g/rG+gqg=", "stat"=>{"id"=>"11", "statname"=>"tt", "cc"=>"tt", "ct"=>"t", "force"=>"ttt", "endurance"=>"tt", "blessure"=>"t", "init"=>"ttt", "attaque"=>"tt", "ld"=>"ttt", "sv"=>"tt"}, "commit"=>"save", "id"=>"11"}
  Stat Load (0.2ms)  SELECT  "stats".* FROM "stats"  WHERE "stats"."id" = ? LIMIT 1  [["id", 11]]
   (0.1ms)  begin transaction
  SQL (0.5ms)  UPDATE "stats" SET "attaque" = ?, "blessure" = ?, "cc" = ?, "ct" = ?, "endurance" = ?, "force" = ?, "init" = ?, "ld" = ?, "statname" = ?, "sv" = ?, "updated_at" = ? WHERE "stats"."id" = 11  [["attaque", "tt"], ["blessure", "t"], ["cc", "tt"], ["ct", "t"], ["endurance", "tt"], ["force", "ttt"], ["init", "ttt"], ["ld", "ttt"], ["statname", "tt"], ["sv", "tt"], ["updated_at", "2015-06-09 12:04:09.051306"]]
   (15.9ms)  commit transaction
Redirected to http://ift.tt/1MkPB8l
Completed 302 Found in 25ms (ActiveRecord: 16.8ms)

.

class StatsController < ApplicationController
  def index
    @stats = Stat.all
  end 

  def show
    @stat = Stat.find(params[:id])
    @units = @stat.units
  end

  def new
    @stat = Stat.new
  end

  def edit 
    @stat = Stat.find(params[:id])
  end

  def update 
    @stat = Stat.find(params[:id])
    @stat.update(stat_params)
    redirect_to "/stats"
    flash[:notice] = "work"
  end

  def new
    @stat = Stat.new
  end 

  def create
    @stat = Stat.new
    if @stat.save 
      redirect_to "/stats" 
      flash[:notice] = "work"
    else 
      render "new"
      flash[:notice] = "didn't work"
    end 
  end 



    private

    def stat_params
        params.require(:stat).permit(:cc, :ct, :force, :endurance, :blessure, :init, :attaque, :ld, :sv, :id, :statname)
    end



end