Searching a hash by value

ruby-talk
1

Hi
I am looking at google for this solution
i got few commands to do that... but i cant figured it out ,

example my code

result = JSON.parse(response.body)

                result.each do |key,value|

                        #if k.has_value?'CHECK_NRPE: Socket timeout
after 10 seconds'
                                puts
"-----------------------------------------------"
                                puts key["host_display_name"]
#reference properties like this
                                puts key["plugin_output"] # this is
the result in object form
                                puts key["display_name"]
                                puts key["last_time_critical"]
                                puts
"------------------------------------------------"
                        #end
                end

Basically the output is like :

myserver.home.lan
CHECK_NRPE: Socket timeout after 10 seconds.
Memory Load
1355046656

What i am after is

if key["plugin_output"] == "CHECK_NRPE: Socket timeout after 10
seconds."
puts key["host_display_name"] #reference properties like this
end

but that doe not work
also if i try

if result.has_value?'CHECK MAINT: MAINTANANCE MODE ENABLED ON HOST'
stil it through the error

Can any one please give me some light on this
Thanks

···

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2

Ferdous ara wrote in post #1088371:

Hi
I am looking at google for this solution
i got few commands to do that... but i cant figured it out ,

example my code

result = JSON.parse(response.body)

                result.each do |key,value|

                        #if k.has_value?'CHECK_NRPE: Socket timeout
after 10 seconds'
                                puts
"-----------------------------------------------"
                                puts key["host_display_name"]
#reference properties like this
                                puts key["plugin_output"] # this is
the result in object form
                                puts key["display_name"]
                                puts key["last_time_critical"]
                                puts
"------------------------------------------------"
                        #end
                end

Basically the output is like :

myserver.home.lan
CHECK_NRPE: Socket timeout after 10 seconds.
Memory Load
1355046656

What i am after is

if key["plugin_output"] == "CHECK_NRPE: Socket timeout after 10
seconds."
puts key["host_display_name"] #reference properties like this
end

but that doe not work
also if i try

if result.has_value?'CHECK MAINT: MAINTANANCE MODE ENABLED ON HOST'
stil it through the error

Can any one please give me some light on this
Thanks

Well, let see if I understand, meaby you are confused. Judging by your
code, the result variable points to a #Hash, so:

#result = {key => value, ..}

So, if I'm in the right way then I realize that each key is also a
#Hash, because you say:

#key["host_display_name"]

So the result variable appear to be something like this:

#result = {#Hash => value, ..}

Meaby the values are the Hash and the key is another object, like a
symbol. I didn't played with JSON, don't know how it works, but if my
aproach is right instead of do #key["host_display_name"] you have to do:

#value["host_display_name"]

If the result variable is something like this:

#result = {:some_key => {"host_display_name" => #Object}, ..}

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3

may be i need to design my logic in a different way
let me explain

basically in that hash table (out put of JSON)

as key => value

i got like this
[
{
"notes_expanded" : "check_maintanance_mode",
      "host_comments" : [],
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
       "host" : service2.home.lan,

}
{
"notes_expanded" : "check_memory ",
      "host_comments" : [],
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
       "host" : service.home.lan,

}
{
"notes_expanded" : "check_maintanance_mode",
      "host_comments" : [],
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
      "host" : service.home.lan,

}
]

So Basically i want to get all the host which
notes_expanded = check_maintanance_mode
so i should get only 2

Does it make sense ??

···

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4

results = []

data = [
  {
    "notes_expanded" => "check_maintenance_mode",
    "host_comments" => [],
    "host_icon_image_expanded" => "",
    "checks_enabled" => 1,
    "max_check_attempts" => 3,
    "host" => "service2.home.lan",

  },
  {
    "notes_expanded" => "check_memory ",
    "host_comments" => [],
    "host_icon_image_expanded" => "",
    "checks_enabled" => 1,
    "max_check_attempts" => 3,
    "host" => "service.NOT_THIS_ONE.home.lan",
  },
  {
    "notes_expanded" => "check_maintenance_mode",
    "host_comments" => [],
    "host_icon_image_expanded" => "",
    "checks_enabled" => 1,
    "max_check_attempts" => 3,
    "host" => "service.home.lan",
  },
]

data.each do |hash|
  if hash["notes_expanded"] == "check_maintenance_mode"
    results << hash["host"]
  end
end

p results

--output:--
["service2.home.lan", "service.home.lan"]

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5

#Hash, because you say:

#key["host_display_name"]

So the result variable appear to be something like this:

#result = {#Hash => value, ..}

yes that right , a sample out put is like

       "notes" : "HP Raid Check",
      "host_notifications_enabled" : 1,
      "host_active_checks_enabled" : 1,
      "icon_image" : "",
      "check_interval" : 60,

So if i say puts key["notes"] : the value will be HP raid Check

but will this work : #value["host_display_name"] ??
I will try in a bit ..

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6

Yes, but it's something completely different than selecting from a
Hash based on values. You rather want something like

items = stuff.select {|h| h["notes_expanded"] == "check_maintanance_mode"}

Kind regards

robert

···

On Sun, Dec 9, 2012 at 2:21 PM, Ferdous ara <lists@ruby-forum.com> wrote:

may be i need to design my logic in a different way
let me explain

basically in that hash table (out put of JSON)

as key => value

i got like this
[
{
"notes_expanded" : "check_maintanance_mode",
      "host_comments" : ,
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
       "host" : service2.home.lan,

}
{
"notes_expanded" : "check_memory ",
      "host_comments" : ,
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
       "host" : service.home.lan,

}
{
"notes_expanded" : "check_maintanance_mode",
      "host_comments" : ,
      "host_icon_image_expanded" : "",
      "checks_enabled" : 1,
      "max_check_attempts" : 3,
      "host" : service.home.lan,

}
]

So Basically i want to get all the host which
notes_expanded = check_maintanance_mode
so i should get only 2

Does it make sense ??

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

7

No. For lookup by value you can use Hash#rassoc:

irb(main):003:0> h={"foo" => "bar"}
=> {"foo"=>"bar"}
irb(main):004:0> h.rassoc "bar"
=> ["foo", "bar"]
irb(main):005:0> key, val = h.rassoc "bar"
=> ["foo", "bar"]
irb(main):006:0> key
=> "foo"

Be warned though that this may be inefficient. You probably want a
second Hash keyed by value.

Kind regards

robert

···

On Sun, Dec 9, 2012 at 1:35 PM, Ferdous ara <lists@ruby-forum.com> wrote:

but will this work : #value["host_display_name"] ??
I will try in a bit ..

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/