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How to convert a fixnum to an array in ruby?
For Example:
s = SituationType.all(:conditions => {:name => 'did not match retrieved design - text misspelled'}).collect(&:id)
result: [10034, 10055]
sf = situation_type_id = SituationType.find_by_name('did not match retrieved design - text misspelled').id
result: 10034
s -sf says,
TypeError: can't convert Fixnum into Array
Do the following
s - [sf]
Since sf is an integer, It cannot do the subtraction unless you convert it into an array
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Im aiming for a regex formula to return chunks of a string based on a character, if this string contains L1 then its going to be only one chunk, if L2 is found it would return 2 chunks, L3 = 3 chunks.
Example
Lets assume we have this string
"L2N1N1"
and we would like to get 2 string
"L2N1" and "L2N1N1"
Another example
"L3N1N1N2"
to return 3 strings
"L3N1" "L3N1N1" "L3N1N1N2"
Im using Ruby
"L3N1N1N2".sub(/L(\d)(?:N\d)+/) do |m|
$1.to_i.times.map { |i| m[0..3+2*i] }.join(' ')
end
#⇒ "L3N1 L3N1N1 L3N1N1N2"
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My current array of object "sum" is:
[{"sum":{"key1":0,"key2":"2014","key3":0,"key4":"8","key5":0,"key6":"0","key7":0}},
{"sum":{"key1":0,"key2":"2014","key3":0,"key4":"12","key5":0,"key6":"1","key7":0}}]
The target is:
[{"key1":0,"key2":"2014","key3":0,"key4":"8","key5":0,"key6":"0","key7":0,
{"key1":0,"key2":"2014","key3":0,"key4":"12","key5":0,"key6":"1","key7":0}]
Use Array#flat_map
array.flat_map(&:values)
# is same as :
array.flat_map { |hash| hash.values }
# or simply if you have
array.map { |hash| hash["sum"] }
I used symbolize_keys what #Muistooshort mentioned in this topic How to convert Object to array of hashes with symbol keys
So, this is code what I used:
result = arr.map{|e| e.attributes.symbolize_keys}
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I use the excellent faker gem to generate random words for my models. Eg. product.name = Faker::Lorem.word
Sometimes I need to generate a sentence, and I want the length of the sentence to
vary each time.
How to achieve this with ruby?
How about:
result = rand(max_size).times.map { produce_word }
Since you have not provided enough information, this is my approach, [*1..100].sample will return a random number between 1 and 100, so looping that times the string which is returned bya method named get_word will get stored in the array word_array
word_array = []
[*1..100].sample.times do
word_array << get_word
end
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Need to add two arrays before that need to add some value at starting of the first array. Look at the following:
#conunty_format = [ "country", "imps", "revenue","network_revenue"]
final_ca = [2000,55.62,88.69]
I need to add "Canada" to final_ca and generate hash with corresponding county_format.
Hash[#conunty_format.zip(final_ca.unshift('canada'))]
=> {"country"=>"canada", "imps"=>2000, "revenue"=>55.62, "network_revenue"=>88.69}
You can use Array Zip and some properties of Array to achieve it in a single line. see the below code.
resulted_hash = #country_format.zip(final_ca.unshift("Canada")).inject({}) do |r, s| r.merge!({s[0] => s[1]}) end
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I have this:
array = ["a","b","c"]
How do I get this:
"a","b","c"
I need to get the items out of the array, each double-quoted, separated by a comma.
array.collect { |a| "\"#{a}\"" }.join(",")
I'm just started to learn ruby, I guess:
return ["a","b","c"].map{|i| '"' + i + '"'}.join(",")
Might you want to get this:
irb(main):009:0> [1, 2, 3].map(&:to_s).join('","')
=> "1\",\"2\",\"3"
"a","b","c" this is not abject (these are 3 objects). But in ruby any code returns object value. So you should know what you want to get: 1 object (I returning string in this example) or various. If you want to get 3 objects you should extract array like this:
a, b, c = [1,2,3].map(&:to_s)