问在show.html.erb中呈现时未定义的局部变量或方法

EN

class OutcomesController < ApplicationController
    def create
        @decision = Decision.find(params[:decision_id])
        @outcome = @decision.outcomes.create(params[:outcome].permit(:actual, :strength, :weakness))
          redirect_to decision_path(@decision)
    end
end

class Outcome < ActiveRecord::Base
  belongs_to :decision
end

class Decision < ActiveRecord::Base
  has_many :outcomes
end

    <h1>Decision showpage</h1>

<h2><%= @decision.title %></h2>
<p><%= @decision.created_at %></p>
<p><%= @decision.forecast %></p>
<p><%= @decision.review_date %></p>

<%= render @decision.outcomes %>


<%= link_to "Delete Decision", decision_path(@decision), method: :delete, data: { confirm: "Are you sure?" } %>

<%= render "outcomes/form" %>
<%= render "outcomes/outcome" %>

<%= form_for([@decision, @decision.outcomes.build]) do |f| %>
  <%= f.label :actual %>:
  <%= f.text_field :actual %> <br/>

  <%= f.label :strength %>:
  <%= f.text_area :strength %> <br/>

  <%= f.label :weakness %>:
  <%= f.text_area :weakness %> <br/>
  <%= f.submit %>
  <% end %>

<%= outcomes.actual %>
<%= outcomes.strength %>
<%= outcomes.weakness %>