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我想在卡片中顯示一個隨機對象。我想顯示一個隨機對象
<div class="row">
<% @slots.sample(3).each do |slot| %>
<div class="col-md-4 col-sm-6">
<div class="card-image">
<%= link_to slot_path(slot) do %>
<% if slot.photo? %>
<%= cl_image_tag slot.photo, class: "img-rounded img-responsive", height: 262, width: 195 %>
<% else %>
<%= image_tag "image_placeholder.jpg", class: "fileinput-new thumbnail img-no-padding", height: 250, width: 400 %>
<% end %>
<% end %>
<div class="details">
<div class="author">
<%= link_to slot_user(slot) do %>
<%= cl_image_tag slot.user.photo, class: "img-circle img-no-padding img-responsive" %>
<span class="name"><%= slot.name %></span>
<span class="meta"><%= slot.user.first_name %> <%= slot.user.last_name %></span>
<% end %>
</div>
</div>
</div>
</div>
<% end %>
</div>
我的代碼返回錯誤信息,如:
"undefined method `sample' for nil:NilClass",
"undefined method `photo' for nil:NilClass",
"undefined method `user' for nil:NilClass"
我不明白。你可以幫我嗎?
澤感謝您的指正!這是我第一次發佈到stackoverflow =) – user8109925
什麼是@ @ slots? 「slot」是怎麼樣的? – spickermann
@slots是未定義的(無)...您從未設置它。 – SteveTurczyn