Array#sort_by is what you’re after. a.sort_by do |element| b.index(element) end More scalable version in response to comment: a=[“one”, “two”, “three”] b=[“two”, “one”, “three”] lookup = {} b.each_with_index do |item, index| lookup[item] = index end a.sort_by do |item| lookup.fetch(item) end
A Time is a number of seconds since an epoch whereas a DateTime is a number of days since an epoch which is why adding 1 to a DateTime adds a whole day. You can however add fractions of a day, for example d = DateTime.now d + Rational(10, 86400) Will add 10 seconds to … Read more
Modules in Ruby aren’t really that special, so you can just assign them to another constant: [4] (pry) main: 0> module TestModule [4] (pry) main: 0* def self.foo [4] (pry) main: 0* “test” [4] (pry) main: 0* end [4] (pry) main: 0* end => nil [5] (pry) main: 0> tm = TestModule => TestModule [6] … Read more
The error explains what the problem is – you have a constant being assigned in a context that’s too dynamic – i.e. inside the index method. The solution is to define it outside: DashItem = Struct.new(:name, :amount, :moderated) def index @dashboard_items = [] …
Convert the key from a string to a symbol, and do a lookup in the hash. hash = {:key1 => “value1”, :key2 => “value2”} k = ‘key1′ hash[k.to_sym] # or iow, hash[:key1], which will return “value1” Rails uses this class called HashWithIndifferentAccess that proves to be very useful in such cases. I know that you’ve … Read more
I find the following way of running processes with Net::SSH much more useful. It provides you with distinct stdout and stderr, exit code and exit signal. require ‘rubygems’ require ‘net/ssh’ require ‘etc’ server=”localhost” def ssh_exec!(ssh, command) stdout_data = “” stderr_data = “” exit_code = nil exit_signal = nil ssh.open_channel do |channel| channel.exec(command) do |ch, success| … Read more
Your rvm is probably not up to date, and by doing so the list of installable rubies also. Rvm probably took the best match, that was Rubinius 2 When you do rvm list known You obtain the list of known rubies that you can install This list is updated at the same time you update … Read more
You can use Array#pack: [“666f6f626172”].pack(‘H*’) #=> “foobar” H is the directive for a hex string (high nibble first).
You can use #{} just like in a string. 1.9.2p290 :001 > some_string = “033112” => “033112” 1.9.2p290 :002 > a_regex = /[A-Z]{1,4}#{some_string}[A-Z]{1-5}-EQB.html/ => /[A-Z]{1,4}033112[A-Z]{1-5}-EQB.html/
The gem install ffi fails due to the gem trying to build a bundled copy of libffi, which does not work due to assumptions that /usr/bin/env exists and too old libffi copy. However, you can build the ffi gem against the system libffi – install the packages: apt install clang make ruby-dev libffi-dev After that … Read more