假设我有以下数据集
[
{
:name => "sam",
:animal => "dog",
:gender => "male"
}, {
:name => "max",
:animal => "cat",
:gender => "female"
}, {
:name => "joe",
:animal => "snake",
:gender => "male"
}
]
您将如何将哈希数组分组为：
{
:name => ["sam", "max", "joe"]
:animal => ["dog", "cat", "snake"]
:gender => ["male", "female", "male"]
}
我已经阅读过类似的文章，例如this和Group array of hashes by key
但是，大多数示例将值作为增量计数返回，我正在寻找实际的单独值。
我的尝试
keys = []
values = []
arr.each do |a|
a.each do |k, v|
keys << …看完这个答案后,我仍然无法将标记显示在页面中央.
我的代码如下;
在视图中
<div class="Flexible-container">
<!--Google Maps Div-->
<div id="map" style='width: 425; height: 425px;' frameborder="0" scrolling="no" marginheight="0" marginwidth="0"></div>
</div>
<!-- End of Responsive iFrame -->
<script type="text/javascript">
handler = Gmaps.build('Google');
handler.buildMap({ provider: {}, internal: {id: 'map'}}, function(){
markers = handler.addMarkers(<%=raw @hash.to_json %>);
handler.map.centerOn(markers[0]);
handler.bounds.extendWith(markers);
handler.fitMapToBounds();
handler.map.serviceObject.setZoom(16);
});
</script>
在控制器中
def edit
@user = current_user
@hash = Gmaps4rails.build_markers(@user) do |u, marker|
marker.lat u.latitude
marker.lng u.longitude
marker.infowindow u.name
end
end
CSS
/* Flexible iFrame */
.Flexible-container {
position: relative;
padding-bottom: …在阅读悬停图像上的“中心字体真棒”图标及其相应答案后，我仍然无法使用离子图标复制此答案。
我正在使用的代码如下：
<div class="video-thumbnail">
<img src="image here" />
<i class="icon ion-play"></i>
</div>
我使用的 CSS 是：
.video-thumbnail {
position: relative;
margin: 0 auto;
display: inline-block;
}
.video-thumbnail img {
position: absolute;
}
.video-thumbnail i {
position: absolute;
top: 50%;
transform: translateY(-50%);
}
我已经把它放在彼此之上，但似乎找不到中间点。寻找水平和垂直居中。我不是在寻找任何悬停状态，只是图像上的一个明显图标。
谢谢！
假设我收到一个字符串:
"27,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,12,17,17,41,17,17,17,17,17,17,17,17,17,17,17,17,17,26,26,26,26,26,26,26,26,26,29,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,40,48,28,28,28,28,28,28,28,28,28,28,28,28,28,28,29,29,29,29,29,29,29,29,29,29,29,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,34,34,34,34,34,34,36,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,34,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,36,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,39,40,40,40,40,40,40,40,40,41,41,41,41,41,41,41,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,43,43,43,43,43,43,43,43,43,43,43,43,43,44,44,44,44,48,49,29,41,6,30,11,29,29,36,29,29,36,29,43,1,29,29,29,1,41"
我通过调用把它变成一个数组
str.split(',')
然后通过调用将其变为哈希
arr.compact.inject(Hash.new(0)) { |h, e| h[e] += 1 ; h }
我会得到一个看起来像哈希的哈希
{"1"=>2, "6"=>1, "39"=>23, "36"=>23, "34"=>39, "32"=>31, "30"=>18, "3"=>8, "2"=>10, "28"=>36, "29"=>21, "26"=>41, "27"=>48, "49"=>1, "44"=>4, "43"=>14, "42"=>34, "48"=>2, "40"=>9, "41"=>10, "11"=>1, "17"=>15, "12"=>1}
但是,我想按密钥对哈希进行排序.
我试过这里列出的解决方案.
我相信我的问题与他们的键是字符串的事实有关.
我得到的最接近的是使用
Hash[h.sort_by{|k,v| k.to_i}]