How to check if a value exists in an array in Ruby
You're looking for include?
:
>> ['Cat', 'Dog', 'Bird'].include? 'Dog'
=> true
How can i check if a value exists in an array?
You could use any?
:
checkresults.any? { |r| !r.status }
This will return a true
or false
for you.
How to check if a specific value exists in a multidimensional array?
If you know you only have an array-of-arrays (i.e. exactly two levels) then you could use Array#any?
and Array#include?
:
array.any? { |a| a.include?(word) }
Both any?
and include?
short circuit so they'll return true
as soon as the target is found.
How to check if a specific value exists between values in an array in Ruby
let's check if any of the array's items include Soap
soap_present = arr.any? { |item| item.include?('Soap') }
How to check if a key exists in an array of arrays?
If you only need a true/false answer you can flatten the array and call include on that:
>> myArray.flatten.include?("c")
=> true
Determine if a value exists in an array of hashes
array_of_hashes.any? {|h| h[:a] == 11}
Check if certain value exists in array of hash map
The any?
and include?
methods sound like what you need.
Example:
params.any? { |param| param.include?(:sku) }
This is an efficient way to do it, as it "short circuits", stopping as soon as a match is found.
How would I check if a value is found in an array of values
You can use Array#include?
So...
if @associated_linked_pub.include? linkedpub.LPU_ID
...
Edit:
If @associated_linked_pub
is a list of ActiveRecord objects then try this instead:
if @associated_linked_pub.map{|a| a.id}.include? linkedpub.LPU_ID
...
Edit:
Looking at your question in more detail, it looks like what you are doing is VERY inefficient and unscalable. Instead you could do...
For Rails 3.0:
Linkedpub.where(:id => @associated_linked_pub)
For Rails 2.x:
LinkedPub.find(:all, :conditions => { :id => @associated_linked_pub })
Rails will automatically create a SQL IN query such as:
SELECT * FROM linkedpubs WHERE id IN (34, 6, 2, 67, 8)
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