ruby

问题 I have just noticed that RSpec's match_array is abbreviating the error response. e.g., expected collection contained: [beginning, of, the, array....end, of, the, array] This did not use to be the case. Previously the output displayed the entire array contents, making it easier to identify what is causing the problem. It has been some time since I've had a failing match_array in these tests, so I'm not sure what has changed. Is there a setting to provide a more verbose match_array message? 回答1

问题 I have just noticed that RSpec's match_array is abbreviating the error response. e.g., expected collection contained: [beginning, of, the, array....end, of, the, array] This did not use to be the case. Previously the output displayed the entire array contents, making it easier to identify what is causing the problem. It has been some time since I've had a failing match_array in these tests, so I'm not sure what has changed. Is there a setting to provide a more verbose match_array message? 回答1

问题 Our project is written in Objective-C, and use an old version of cocoapod (0.38.0). All my colleagues use the old version of Ruby (2.0.0). I have the latest version of Ruby (2.3.1), so I need to install more the old Ruby version (2.0.0) as my colleagues have. rvm install 2.0.0 rvm use 2.0.0 I cocoapod install pod _0.38.0_ install and get an error like this: Ignoring executable-hooks-1.3.2 because its extensions are not built. Try: gem pristine executable-hooks --version 1.3.2 Ignoring gem

问题 I am making a short, text-based game as an extra credit exercise based on the Ruby I have learned so far and I'm having trouble getting classes to read and write variables between each other. I have read extensively and searched for clarification on how to do this but I haven't had much luck. I have tried using @ instance variables and attr_accessible but I can't figure it out. Here is my code so far: class Game attr_accessor :room_count def initialize @room_count = 0 end def play while true

问题 I am making a short, text-based game as an extra credit exercise based on the Ruby I have learned so far and I'm having trouble getting classes to read and write variables between each other. I have read extensively and searched for clarification on how to do this but I haven't had much luck. I have tried using @ instance variables and attr_accessible but I can't figure it out. Here is my code so far: class Game attr_accessor :room_count def initialize @room_count = 0 end def play while true

问题 Given the following class: class Something def initialize @test = "test" end end Why does ruby return nil when invoking an undeclared instance variable? thingy = Something.new thingy.instance_variable_get(:@var) # nil thingy.instance_variable_get(:@test) # "test" As opposed to some error message indicating the variable is missing from the instance. The answer I am hoping for is an explanation as to the reasoning behind ruby's implementation of instance variables in this way. 回答1: It's just

问题 I've been learning some algorithms and I can't find the reason why my method is failing. if you could look at the code and shed some light as to why that is happening. I would truly appreciate it. I'm trying to write a method that would binary search an array recursively and so far that is all my code. def recursive_binary_search(arr, target) max_index = arr.length - 1 mid_index = max_index / 2 if arr[mid_index] > target new_arr = arr[0..(mid_index - 1)] recursive_binary_search(new_arr,

问题 I have installed ELK stack version 7.0.0 on my CentOS7 VM and I faced with an issue during Logstash service start: [ERROR] 2019-05-13 08:21:37.359 [Converge PipelineAction::Create] agent - Failed to execute action {:action=>LogStash::PipelineAction::Create/pipeline_id:main, :exception=>"MultiJson::ParseError", :message=>"JrJackson::ParseError", :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/multi_json-1.13.1/lib/multi_json/adapter.rb:20:in load'", "/usr/share/logstash/vendor

问题 I'm building a SaaS platform with the apartment gem and am introducing ActionCable for chat functionality. I have most of the chat functionality built, but when transmitting to the channel I get the following: Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket) User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]] An unauthorized connection attempt was

问题 In Ruby, I get: -5 % 3 # => 1 whereas other languages like PHP, Javascript, C++, and Java all produce the result -2 . I don't understand this concept. I hope someone can explain this ruby's calculation method. It would be better if you could use an example of how it works. 回答1: It's in the docs: https://ruby-doc.org/core-2.5.0/Numeric.html#method-i-divmod If q, r = x.divmod(y) , then q = floor(x/y) x = q*y + r The quotient is rounded toward negative infinity So q is -3 (-5 / 2 and round down,