如何在组中迭代哈希元素？
[英]How to iterate hash elements in groups?
问题描述
我有一个非常类似于以下JSON对象的哈希; 这只是一个例子而不是确切的输出。
我需要迭代哈希并按host或service_name对其进行排序，然后在视图中输出我正在处理反映这些排序的块。
如果我转到我的观点期望看到主机列出的内容，并且我在该主机上有十个服务，我需要在每个主机的视图上有一个列表。 同样，当涉及到service_name 。
如果我有100个service_names匹配，我需要阻止它们并将它们列在一起。
我是Rails的新手，并且通常会通过JavaScript和JSON处理这个问题，因为正在做的最终计划用于重度DOM操作，但是主要人员坚持认为这必须首先在服务器端完成，所以我很茫然。
{
"status": "successful",
"service_list": [
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "oozie",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "single-namenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "single-database",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "datanode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "secondarynamenode",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "web",
"status": "DEAD",
"status_message": "Running Master Service",
"host": "1"
},
{
"service_name": "tasktracker",
"status": "RUNNING",
"status_message": "Running Service",
"host": "1"
},
{
"service_name": "jobtracker",
"status": "RUNNING",
"status_message": "Running Master Service",
"host": "1"
}
]
}
2 个解决方案
解决方案1
2 已采纳 2011-12-08 23:41:27
这是使用service_name和textual（而不是HTML）输出对它们进行分组的代码。 HTML将是相同的，但具有合理的HTML标记。 服务名称按字母顺序排序; 除了作为一个例子，没有理由。
svcs = val[:service_list]
puts "#{svcs.size} service entries."
grouped = svcs.group_by { |svc| svc[:service_name] }
puts "#{grouped.size} named services:"
grouped.keys.sort.each do |name|
puts " service: #{name}"
grouped[name].each do |svc|
puts " host: #{svc[:host]}"
puts " status: #{svc[:status]}"
puts " #{svc[:status_message]}"
end
puts '-'*40
end
group_by返回数组的哈希值，由service_name字符串键入（在本例中）（例如， "web" ， "tasktracker"等）。如果需要在每个组的信息中进行排序，请使用sort 。 例如，要通过:status值在每个组中进行排序：
grouped.keys.sort.each do |name|
puts " service: #{name}"
group_info = grouped[name]
sorted_info = group_info.sort { |a, b| a[:status] <=> b[:status] }
sorted_info.each do |svc|
puts " host: #{svc[:host]}"
puts " status: #{svc[:status]}"
puts " #{svc[:status_message]}"
end
puts '-'*40
end
您还可以保存排序方法以供以后使用：
sort_by_status = Proc.new { |a, b| a[:status] <=> b[:status] }
sorted_info = group_info.sort &sort_by_status
这里是JSON转换为Ruby哈希，以备不时之需。
val = {
:status => "successful",
:service_list => [
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "oozie",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "single-namenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "single-database",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "datanode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "secondarynamenode",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "web",
:status => "DEAD",
:status_message => "Running Master Service",
:host => "1"
},
{
:service_name => "tasktracker",
:status => "RUNNING",
:status_message => "Running Service",
:host => "1"
},
{
:service_name => "jobtracker",
:status => "RUNNING",
:status_message => "Running Master Service",
:host => "1"
}
]
}
解决方案2
0 2011-12-08 23:41:56
# Get all the thingies with the service name "web"
thingies.find_all {|thingy| thingy[:service_name] == 'web' }
# Sort all the thingies by status
thingies.sort_by {|thingy| thingy[:status] }
# Put them together
thingies.find_all {|thingy| thingy[:service_name] == 'web' } \
.sort_by {|thingy| thingy[:status]}
如何在视图中访问请求参数并遍历Rails中的ruby中的哈希
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