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I have this array of hashes:
results = [
{"day"=>"2012-08-15", "name"=>"John", "calls"=>"5"},
{"day"=>"2012-08-15", "name"=>"Bill", "calls"=>"8"},
{"day"=>"2012-08-16", "name"=>"Bill", "calls"=>"11"},
]
How can I search the results to find how many calls Bill made on the 15th?
After reading the answers to "Ruby easy search for key-value pair in an array of hashes", I think it might involve expanding upon the following find statement:
results.find { |h| h['day'] == '2012-08-15' }['calls']
890
Accessing an array of hashes You can access the elements of an array of hashes by using array-based indexing to access a particular hash and keys to access values present in that hash.
You can only store scalar values in a hash. References, however, are scalars. This solves the problem of storing multiple values for one key by making $hash{$key} a reference to an array containing values for $key .
Overview. A particular value can be checked to see if it exists in a certain hash by using the has_value?() method. This method returns true if such a value exists, otherwise false .
The cryptographic hashing of a value cannot be inverted to find the original value. Given a value, it is infeasible to find another value with the same cryptographic hash.
You're on the right track!
results.find {|i| i["day"] == "2012-08-15" and i["name"] == "Bill"}["calls"]
# => "8"
results.select { |h| h['day'] == '2012-08-15' && h['name'] == 'Bill' }
.reduce(0) { |res,h| res += h['calls'].to_i } #=> 8
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