- model
一个person可以有多个son，但只有一个father。具体代码如下：
class Person < ActiveRecord::Base
...
has_many :son_relationships, class_name: "Relationship",
foreign_key: 'father_id',
dependent: :destroy
has_one :father_relationships, class_name: "Relationship",
foreign_key: 'son_id',
dependent: :destroy
has_many :sons, through: :son_relationships, source: :son
has_one :father, through: :father_relationships, source: :father
...
end
class Relationship < ActiveRecord::Base
belongs_to :father, class_name: 'Person'
belongs_to :son, class_name: 'Person'
validates :father_id, presence: true
validates :son_id, presence: true
end
这样就能使用person.sons来查看person的儿子。以及person.father来查看person的父亲。
- 完全用css来显示族谱（组织结构）图。原代码请点我
* {
margin: 0;
padding: 0;
}
.tree{
width:760px;
margin:40px auto 0 auto
}
.tree ul {
padding-top: 20px; position: relative;
transition: all 0.5s;
-webkit-transition: all 0.5s;
-moz-transition: all 0.5s;
}
.tree li {
float: left; text-align: center;
list-style-type: none;
position: relative;
padding: 20px 5px 0 5px;
transition: all 0.5s;
-webkit-transition: all 0.5s;
-moz-transition: all 0.5s;
}
/*We will use ::before and ::after to draw the connectors*/
.tree li::before, .tree li::after{
content: '';
position: absolute; top: 0; right: 50%;
border-top: 1px solid #ccc;
width: 50%; height: 20px;
}
.tree li::after{
right: auto; left: 50%;
border-left: 1px solid #ccc;
}
/*We need to remove left-right connectors from elements without
any siblings*/
.tree li:only-child::after, .tree li:only-child::before {
display: none;
}
/*Remove space from the top of single children*/
.tree li:only-child{ padding-top: 0;}
/*Remove left connector from first child and
right connector from last child*/
.tree li:first-child::before, .tree li:last-child::after{
border: 0 none;
}
/*Adding back the vertical connector to the last nodes*/
.tree li:last-child::before{
border-right: 1px solid #ccc;
border-radius: 0 5px 0 0;
-webkit-border-radius: 0 5px 0 0;
-moz-border-radius: 0 5px 0 0;
}
.tree li:first-child::after{
border-radius: 5px 0 0 0;
-webkit-border-radius: 5px 0 0 0;
-moz-border-radius: 5px 0 0 0;
}
/*Time to add downward connectors from parents*/
.tree ul ul::before{
content: '';
position: absolute; top: 0; left: 50%;
border-left: 1px solid #ccc;
width: 0; height: 20px;
}
.tree li a{
border: 1px solid #ccc;
padding: 5px 10px;
text-decoration: none;
color: #666;
font-family: arial, verdana, tahoma;
font-size: 11px;
display: inline-block;
border-radius: 5px;
-webkit-border-radius: 5px;
-moz-border-radius: 5px;
transition: all 0.5s;
-webkit-transition: all 0.5s;
-moz-transition: all 0.5s;
}
/*Time for some hover effects*/
/*We will apply the hover effect the the lineage of the element also*/
.tree li a:hover, .tree li a:hover+ul li a {
background: #c8e4f8; color: #000; border: 1px solid #94a0b4;
}
/*Connector styles on hover*/
.tree li a:hover+ul li::after,
.tree li a:hover+ul li::before,
.tree li a:hover+ul::before,
.tree li a:hover+ul ul::before{
border-color: #94a0b4;
}
- 根据上面的model结构和css的样式，将person的数据进行如下的处理：
app/helpers/people_helper.rb中
def draw_tree(person)
#定义一个hash，用来存储每一个person的数据
generation_hash ||= {}
#定义一个hash，用来记录某个person的下一代的<ul></ul>是否已经添加
h ||= {}
#每一个person对应的数据为一个数组，用数组是因为要让下一代的数据插入到该person的<li></li>中
generation_hash[person.id] = ["<li><a href=\"\#\">#{person.name}</a>","</li>"]
#如果person有下一代，那么则进行以下操作
unless person.sons.empty?
#判断该person的下一代<ul></ul>是否已经添加，如果已添加，则不再添加了
if h[person.id].nil?
#将下一代对应的<ul>添加到person的</a>标签后
generation_hash[person.id].first << "<ul>"
#将下一代对应的</ul>添加到person的</li>前
generation_hash[person.id].last.insert 0,"</ul>"
#标记已经添加下一代的<ul></ul>
h[person.id] = 1
end
person.sons.each do |son|
#将下一代的数据插入到这一代数组的倒数第二个位置上
#同时用到了递归，进行深度遍历
generation_hash[person.id].insert(-2, draw_tree(son))
#这样就形成了类似以下的格式
#<li>
# <a href=\"\#\">#{person.name}</a>
# <ul>
# <li>
# <a href=\"\#\">#{son.name}</a>
# </li>
# </ul>
#</li>
end
end
#最后将generation_hash的values（一个嵌套的数组）进行flatten，然后再join成一个字符串返回
generation_hash.values.flatten.join("")
end
- 在views中调用
<div class='tree'>
<ul>
<%= sanitize draw_tree(Person.find_by(generation:1) %>
</ul>
</div>
- 因为家族数据变化不是特别频繁，所以可以利用cache来缓存家族树的页面片段，提高页面的读取速度
