这似乎很初级，所以我不确定我做错了什么。我有一个 @videos 集合（调试 @videos.count 显示为 4），但该行<%= render @videos %>仅呈现 4 个项目中的 2 个。这是控制器方法（VideosController）：
def index
@video = Video.new(athlete_id: current_user.id, sport_id: current_athlete_sport.id)
@videos = current_user.videos_for_sport(current_athlete_sport).order("date DESC")
debugger
respond_with @videos
end
以及上述<%= render @videos %>行正在渲染的 _video 部分：
<%= form_for video do |f| %>
<div class="row edit-video-container <%= video == @videos.pop ? 'last' : '' %>">
<div class="span4">
<div class="row">
<div class="span4 video-thumbnail">
<%= image_tag video.thumbnail_url || asset_path("video-encoding-placeholder.png"), {alt: "", title: "#{video.name || "My video" + video.id}"} %>
<div class="video-ribbon">
<ul>
<li class="pull-left">
<%= link_to "#video-player-modal", { data: { toggle: "modal", link: video.mp4_video_url, thumbnail: video.thumbnail_url }, role: "button", class: "video-player-link" } do %>
<i class="icon video-play"></i>
<p>Play</br>Video</p>
<% end %>
</li>
<li class="pull-left">
<%= link_to rotate_video_path(video, direction: "ccw"), :data => { :method => "put", :confirm => "Are you sure?", :type => 'json' } do %>
<i class="icon video-rotate-left"></i>
<p>Rotate</br>Left</p>
<% end %>
</li>
<li class="pull-left">
<%= link_to rotate_video_path(video, direction: "cw"), :data => { :method => "put", :confirm => "Are you sure?", :type => 'json' } do %>
<i class="icon video-rotate-right"></i>
<p>Rotate</br>Right</p>
<% end %>
</li>
<li class="pull-left">
<%= link_to video_path(video), :data => { :method => "delete", :confirm => "Are you sure?", :type => 'json' } do %>
<i class="icon video-delete"></i>
<p>Delete</br>Video</p>
<% end %>
</li>
</ul>
</div>
</div>
</div>
<div class="row">
<div class="span4">
<%= f.check_box :featured, { checked: video.featured?, class: "autosave checkbox-right", data: { event: 'change' } } %>
<%= label_tag "video-checkbox-featured-#{video.id}", "Use as featured video?", { class: "checkbox-right-label" } %>
</div>
</div>
</div>
<div class="span4">
<div class="row">
<div class="span4">
<%= label :video, :name, "Video Name" %>
<%= f.text_field :name, { class: "span4 autosave"} %>
</div>
</div>
<div class="row">
<div class="span4">
<%= label :video, :video_type_id, "Video Type" %>
<%= f.select:video_type_id, VideoType.all.collect { |vid| [vid.name, vid.id] }, { include_blank: "Choose One", selected: video.video_type_id }, { class: "chosen-select autosave", id: "", data: { event: 'change' } } %>
</div>
</div>
<div class="row">
<div class="span4">
<%= label :video, :sport_id, "Video Sport" %>
<%= f.select :sport_id, current_user.sports.collect { |sp| [sp.name, sp.id] }, { include_blank: "Choose one", selected: video.sport_id }, { class: "chosen-select autosave", id: "", data: { event: "change" } } %>
</div>
</div>
<div class="row">
<div class="span4">
<%= label :video, :date, "Date Recorded" %>
<%= f.text_field :date, {class: "autosave date datePicker span4", value: js_date(video.date) } %>
</div>
</div>
<div class="row">
<div class="span4">
<%= label :video, :uniform_number, "Uniform Number" %>
<%= f.text_field :uniform_number, { class: "autosave span4"} %>
</div>
</div>
</div>
</div>
<% end %>
同样，在控制器中抛出一个调试器，或者在该<%= render @videos %>行显示 4 个视频之前的页面上进行调试，但实际上只有 2 个被渲染。在这里有点吃亏！