データがアップデートされない

以下のViewとControllerでデータの更新処理を行っているのですが、何故か更新されません。理由も分からず、どうしたら更新されるようになるのか行き詰っています。よろしくお願いします。

View

ruby
1<%= form_for @contest, :url => {:controller => "tops/admins", :action => "update_contest", :contest_id => @contest.id} do |contest| %> 
2  <%= contest.label :name, "name" %>
3  <%= contest.text_field :name %><br>
4  <%= contest.label :describe, "describe" %>
5  <%= contest.text_area :describe %><br>
6  <%= contest.label :min_text_size, "min_text_size" %>
7  <%= contest.number_field :min_text_size %><br>
8  <%= contest.label :max_text_size, "max_text_size" %>
9  <%= contest.number_field :max_text_size %><br>
10  <%= contest.label :start_notice_time, "start_notice_time" %>
11  <%= contest.datetime_select :start_notice_time, :start_year => 2000, :end_year =>2100 %><br>
12  <%= contest.label :start_post_time, "start_post_time" %>
13  <%= contest.datetime_select :start_post_time, :start_year => 2000, :end_year =>2100 %><br>
14  <%= contest.label :start_vote_time, "start_vote_time" %>
15  <%= contest.datetime_select :start_vote_time, :start_year => 2000, :end_year =>2100 %><br>
16  <%= contest.label :start_announce_time, "start_announce_time" %>
17  <%= contest.datetime_select :start_announce_time, :start_year => 2000, :end_year =>2100 %><br>
18  <%= contest.submit %>
19<% end %>

Controller

ruby
1  #データ渡し
2  def edit_contest
3    @contest = Contest.find(params[:contest_id])
4  end
5  #データ受け取り、更新
6  def update_contest
7    @contest = Contest.find(params[:contest_id])
8    if @contest.update(contest_params)
9      redirect_to controller: "tops/admins", action: "show"
10    else
11       redirect_to controller: "tops/admins", action: "show", notice: "failed to update"     
12    end
13  end
14#パラメータ許可
15  def contest_params
16    params.require(:contest).permit(:name,
17                                    :describe,
18                                    :min_text_size,
19                                    :max_text_size,
20                                    :start_notice_time,
21                                    :start_post_time,
22                                    :start_vote_time,
23                                    :start_announce_time)
24  end

また、以下にDB部分のコンソール出力も置いておきます。
UPDATEが行われて、正常に画面遷移し、notice表示もありません。

(0.0ms) BEGIN
SQL (0.5ms) UPDATE "contests" SET "point1_name" = $1, "updated_at" = $2 WHERE "contests"."id" = $3 [["point1_name", "a"], ["updated_at", "2017-06-04 08:31:25.377216"], ["id", 1]]
(32.1ms) COMMIT