Hi, My application allows players to enter a tennis match into a database. Each match has at least one and a maximum of five sets, represented by the set_scores table and model. class Match < ActiveRecord::Base has_many :set_scores end class SetScore < ActiveRecord::Base end DDL of set_scores CREATE TABLE "public"."set_scores" ( "match_id" INTEGER NOT NULL, "set_nr" SMALLINT NOT NULL, "score_opp1" SMALLINT NOT NULL, "score_opp2" SMALLINT NOT NULL, CONSTRAINT "set_scores_fk" FOREIGN KEY ("match_id") REFERENCES "public"."matches"("id") ON DELETE CASCADE ON UPDATE CASCADE DEFERRABLE INITIALLY DEFERRED ) WITH OIDS; Now my problem is how do I generate the correct form for this? (fragment _form.rhtml) <% for i in 1..5 %> <%= hidden_field "set_score[]", "set_nr", {:value => i } %> <tr> <th>Set <%=i%></td> <td class="center"><%= text_field "set_score[]", ''score_opp1'', "size" => 3 %></td> <td class="center">-</td> <td class="center"><%= text_field "set_score[]", ''score_opp2'', "size" => 3 %></td> </tr> <% end %> This doesn''t work as it doesn''t create an array of set_scores, the HTML output is simply this: <input id="set_score_set_nr" name="set_score[set_nr]" type="hidden" value="1" /> <tr> <th>Set 1</td> <td class="center"><input id="set_score_score_opp1" name="set_score[score_opp1]" size="3" type="text" /></td> <td class="center">-</td> <td class="center"><input id="set_score_score_opp2" name="set_score[score_opp2]" size="3" type="text" /></td> </tr> <input id="set_score_set_nr" name="set_score[set_nr]" type="hidden" value="2" /> <tr> <th>Set 2</td> <td class="center"><input id="set_score_score_opp1" name="set_score[score_opp1]" size="3" type="text" /></td> <td class="center">-</td> <td class="center"><input id="set_score_score_opp2" name="set_score[score_opp2]" size="3" type="text" /></td> </tr> ... I want it to output something like: <input name="set_score[][set_nr]" type="hidden" value="2" /> I also tried putting this in the controller def new @match = Match.new @set_scores = [SetScore.new, SetScore.new, SetScore.new, SetScore.new, SetScore.new] end And this in _form.rhtml <% for @set_score in @set_scores %> <tr> <th>Set </td> <td class="center"><%= text_field "set_score[]", ''score_opp1'', "size" => 3 %></td> <td class="center">-</td> <td class="center"><%= text_field "set_score[]", ''score_opp2'', "size" => 3 %></td> </tr> <% end %> Again with no luck... Jeroen