I have some problems with a hash:
"commissions"=>
{"commission"=>
{"commissionID"=>"38767647",
"date"=>"2014-09-22",
"publisherID"=>"46272",
"domainID"=>"1173659",
"merchantID"=>"35216",
"commissionValue"=>110,
"orderValue"=>2095,
"currency"=>"USD",
"url"=>"http://www.asos.com"},
"commission5"=>
{
other params
}
How can I get the value of 'commissionValue'?
Use [] to get value of the hash by key.
h = {"commissions"=>
{"commission"=>
{"commissionID"=>"38767647",
"date"=>"2014-09-22",
"publisherID"=>"46272",
"domainID"=>"1173659",
"merchantID"=>"35216",
"commissionValue"=>110,
"orderValue"=>2095,
"currency"=>"USD",
"url"=>"http://www.asos.com"},
"commission5"=> { }
}
}
h["commissions"]["commission"]["commissionValue"]
# => 110
Related
How do I print the group_id from the returned object?
The following is returned from a function. I want to print the group_id or maybe return the group_id
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
This is the function: I want to return security_group.group_id
def describe_security_group (
group_name
)
ec2 = get_aws_client
security_group = ec2.describe_security_groups(
filters: [
{name: 'group-name', values: [ group_name ]}]
)
puts "Describing security group '#{group_name}' with ID " \
"'#{security_group}'"
return security_group
rescue StandardError => e
puts "Error describing security group: #{e.message}"
return
end
So, returning value seems like a hash, or you can make it hash exactly.
For case with one-element array you can simple use ruby dig method.
And according to your datum and comment below we can access needed element like this:
# from your ec2 api call
security_group = ec2.describe_security_groups(...)
# Result value is stored in `security_group` variable,
# and looks exactly like hash below
{
:security_groups=>[
{
:description=>"Created By ManageIQ",
:group_name=>"MIQ_019",
:ip_permissions=>[
{
:from_port=>22,
:ip_protocol=>"tcp",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>22,
:user_id_group_pairs=>[]
}
],
:owner_id=>"943755119718",
:group_id=>"sg-0c2c5f219f1bafc1a",
:ip_permissions_egress=>[
{
:from_port=>nil,
:ip_protocol=>"-1",
:ip_ranges=>[
{
:cidr_ip=>"0.0.0.0/0",
:description=>nil
}
],
:ipv_6_ranges=>[],
:prefix_list_ids=>[],
:to_port=>nil,
:user_id_group_pairs=>[]
}
],
:tags=>[],
:vpc_id=>"vpc-d817c1b3"
}
],
:next_token=>nil
}
# And this is a target value, that you can store in another one,
# return from method or simply print to output
security_group.dig(:security_groups)
.try(:[], 0)
.dig(:group_id)
=> "sg-0c2c5f219f1bafc1a"
But if you need to search in array with multiple elements, methods from Ruby's Enumerable module could be helpful (like select or reject).
UPDATE with OpenStruct, if you prefer such method calls with dot notation:
json = security_group.to_json
os = JSON.parse(json, object_class: OpenStruct)
os.security_groups.first.group_id
=> "sg-0c2c5f219f1bafc1a"
I have a Hash:
urls = [{'logs' => 'foo'},{'notifications' => 'bar'}]
The goal is to add a prefix to the keys:
urls = [{'example.com/logs' => 'foo'},{'example.com/notifications' => 'bar'}]
My attempt:
urls.map {|e| e.keys.map { |k| "example.com#{k}" }}
Then I get an array with the desired form of the keys but how can I manipulate the original hash?
If you want to "manually" transform the keys, then you can first iterate over your array of hashes, and then over each object (each hash) map their value to a hash where the key is interpolated with "example.com/", and the value remains the same:
urls.flat_map { |hash| hash.map { |key, value| { "example.com/#{key}" => value } } }
# [{"example.com/logs"=>"foo"}, {"example.com/notifications"=>"bar"}]
Notice urls are being "flat-mapped", otherwise you'd get an arrays of arrays containing hash/es.
If you prefer to simplify that, you can use the built-in method for for transforming the keys in a hash that Ruby has; Hash#transform_keys:
urls.map { |url| url.transform_keys { |key| "example.com/#{key}" } }
# [{"example.com/logs"=>"foo"}, {"example.com/notifications"=>"bar"}]
Use transform_keys.
urls = [{'logs' => 'foo'}, {'notifications' => 'bar'}]
urls.map { |hash| hash.transform_keys { |key| "example.com/#{key}" } }
# => [{"example.com/logs"=>"foo"}, {"example.com/notifications"=>"bar"}]
One question: are you best served with an array of hashes here, or would a single hash suit better? For example:
urls = { 'logs' => 'foo', 'notifications' => 'bar' }
Seems a little more sensible a way to store the data. Then, saying you did still need to transform these:
urls.transform_keys { |key| "example.com/#{key}" }
# => {"example.com/logs"=>"foo", "example.com/notifications"=>"bar"}
Or to get from your original array to the hash output:
urls = [{'logs' => 'foo'}, {'notifications' => 'bar'}]
urls.reduce({}, &:merge).transform_keys { |key| "example.com/#{key}" }
# => {"example.com/logs"=>"foo", "example.com/notifications"=>"bar"}
Much easier to work with IMHO :)
If you don't have access to Hash#transform_keys i.e. Ruby < 2.5.5 this should work:
urls.map{ |h| a = h.to_a; { 'example.com/' + a[0][0] => a[0][1] } }
The hash I'm working with has a hash for it's values which always contains an ID, name, and description. I am not interested in keeping the ID or name and just want to replace every hash value with its corresponding description.
Code
hsh['nested']['entries']['addr'] = hsh['nested']['entries']['addr']['description']
hsh['nested']['entries']['port'] = hsh['nested']['entries']['port']['description']
hsh['nested']['entries']['protocol'] = hsh['nested']['entries']['protocol']['description']
hsh['nested']['entries']['type'] = hsh['nested']['entries']['type']['description']
... (many more)
This works fine, but it is not very elegant--in reality, I have 20 entries/lines of code to get the job done.
Structure of the hash value (for hsh['nested']['entries']['addr'])
{ "id" => "27", "name" => "Instance", "description" => "**This is what I need.**" }
Taking the first line of code above as a sample, the end result would be the value of hsh['nested']['entries']['addr'] becomes **This is what I need.**
What is an elegant way to achieve this?
hsh = { 'nested'=>
{ 'entries'=>
{
'addr'=>{ "id" => "1", "description"=>"addr" },
'port'=>{ "id" => "2", "description"=>"port" },
'cats'=>{ "id" => "3", "description"=>"dogs" },
'type'=>{ "id" => "4", "description"=>"type" }
}
}
}
keys_to_replace = ["addr", "port", "type"]
hsh['nested']['entries'].tap { |h| keys_to_replace.each { |k| h[k]=h[k]["description"] }
#=> { "addr"=>"addr",
# "port"=>"port",
# "cats"=>{"id"=>"3", "description"=>"dogs"},
# "type"=>"type"
# }
hsh
#=> {"nested"=>
# { "entries"=>
# { "addr"=>"addr",
# "port"=>"port",
# "cats"=>{"id"=>"3", "description"=>"dogs"},
# "type"=>"type"
# }
# }
# }
sub_hash = hsh['nested']['entries']
categories = %w{addr port protocol type}
categories.each do |category|
sub_hash[category] = sub_hash[category]['description']
end
I am doing an mongodb aggregation using mongoid, using ModleName.collection.aggregate(pipeline) . The value returned is an array and not a Mongoid::Criteria, so if a do a first on the array, I get the first element which is of the type BSON::Document instead of ModelName. As a result, I am unable to use it as a model.
Is there a method to return a criteria instead of an array from the aggregation, or convert a bson document to a model instance?
Using mongoid (4.0.0)
I've been struggling with this on my own too. I'm afraid you have to build your "models" on your own. Let's take an example from my code:
class Searcher
# ...
def results(page: 1, per_page: 50)
pipeline = []
pipeline <<
"$match" => {
title: /#{#params['query']}/i
}
}
geoNear = {
"near" => coordinates,
"distanceField" => "distance",
"distanceMultiplier" => 3959,
"num" => 500,
"spherical" => true,
}
pipeline << {
"$geoNear" => geoNear
}
count = aggregate(pipeline).count
pipeline << { "$skip" => ((page.to_i - 1) * per_page) }
pipeline << { "$limit" => per_page }
places_hash = aggregate(pipeline)
places = places_hash.map { |attrs| Offer.new(attrs) { |o| o.new_record = false } }
# ...
places
end
def aggregate(pipeline)
Offer.collection.aggregate(pipeline)
end
end
I've omitted a lot of code from original project, just to present the way what I've been doing.
The most important thing here was the line:
places_hash.map { |attrs| Offer.new(attrs) { |o| o.new_record = false } }
Where both I'm creating an array of Offers, but additionally, manually I'm setting their new_record attribute to false, so they behave like any other documents get by simple Offer.where(...).
It's not beautiful, but it worked for me, and I could take the best of whole Aggregation Framework!
Hope that helps!
I have this hash:
response = '{"librairies":[{"id":1,"books":[{"id":1,"qty":1},{"id":2,"qty":3}]},{"id":2,"books":[{"id":1,"qty":0},{"id":2,"qty":3}]}]}'
in which I'd like to delete every librairies where, at least, one of the book quantity is null.
For instance, with this given response, I'd expect this return:
'{"librairies":[{"id":1,"books":[{"id":1,"qty":1},{"id":2,"qty":3}]}]}'
I've tried this:
parsed = JSON.parse(response)
parsed["librairies"].each do |library|
library["books"].each do |book|
parsed.delete(library) if book["qty"] == 0
end
end
but this returns the exact same response hash, without having deleted the second library (the one with id => 2).
You can use Array#delete_if and Enumerable#any? for this
# Move through each array element with delete_if
parsed["librairies"].delete_if do |library|
# evaluates to true if any book hash in the library
# has a "qty" value of 0
library["books"].any? { |book| book["qty"] == 0 }
end
Hope this helps
To avoid changing the hash parsed, you could do the following.
Firstly, let's format parsed so we can see what we're dealing with:
parsed = { "libraries"=>[ { "id"=>1,
"books"=>[ { "id"=>1, "qty"=>1 },
{ "id"=>2, "qty"=>3 } ]
},
{ "id"=>2,
"books"=>[ { "id"=>1, "qty"=>0 },
{ "id"=>2, "qty"=>3 } ]
}
]
}
Later I want to show that parsed has not been changed when we create the new hash. An easy way of doing that is to compute a hash code on parsed before and after, and see if it changes. (While it's not 100% certain that different hashes won't have the same hash code, here it's not something to lose sleep over.)
parsed.hash
#=> 852445412783960729
We first need to make a "deep copy" of parsed so that changes to the copy will not affect parsed. One way of doing that is to use the Marshal module:
new_parsed = Marshal.load(Marshal.dump(parsed))
We can now modify the copy as required:
new_parsed["libraries"].reject! { |h| h["books"].any? { |g| g["qty"].zero? } }
#=> [ { "id"=>1,
# "books"=>[ { "id"=>1, "qty"=>1 },
# { "id"=>2, "qty"=>3 }
# ]
# }
# ]
new_parsed # => { "libraries"=>[ { "id"=>1,
"books"=>[ { "id"=>1, "qty"=>1},
{ "id"=>2, "qty"=>3}
]
}
]
}
And we confirm the original hash was not changed:
parsed.hash
#=> 852445412783960729