ローカルでは反映されないエラーが、本番ではエラーと認識されることがあります。
例えば、ECサイトを作成し商品一覧は問題なく表示されるが、商品の詳細画面にアクセスするとsyntaxエラー（hamlで記述している場合はインデント等）が起きている場合、本番ではエラーがあると認識されサイト全体が閲覧できないことがあります。
ローカルで確認し、エラーの箇所が分からなければ、サーバー側から
less log/production.log
less log/unicorn.log
CODES={}CODES["Example"]=<<'EOS'
def foo
"Hello world" if
false
end
puts foo
EOSCODES["Problem 1-1"]=<<'EOS'
# Hint: Use Ruby 2.6
puts "#{"Goodbye".."Hello"} world"
EOSCODES["Problem 1-2"]=<<'EOS'
puts&.then {
# Hint: &. is a safe
# navigation operator
"Hello world"
}
EOSCODES["Problem 1-3"]=<<'EOS'
include Math
# Hint: the most beautiful equation
Out, *,
Count = $>,
$<, E ** (2 * PI)
Out.puts("Hello world" *
Count.abs.round)
EOSCODES["Problem 2-1"]=<<'EOS'
def say
-> {
"Hello world"
}
# Hint: you should call the Proc.
yield
end
puts say { "Goodbye world" }
EOSCODES["Problem 2-2"]=<<'EOS'
e = Enumerator.new do |g|
# Hint: Enumerator is
# essentially Fiber.
yield "Hello world"
end
puts e.next
EOSCODES["Problem 2-3"]=<<'EOS'
$s = 0
def say(n = 0)
$s = $s * 4 + n
end
i, j, k = 1, 2, 3
say i
say j
say k
# Hint: Binary representation.
$s != 35 or puts("Hello world")
EOSCODES["Problem 3-1"]=<<'EOS'
def say s="Hello", t:'world'
"#{s}#{t} world"
end
# Hint: Arguments in Ruby are
# difficult.
puts say :p
EOSCODES["Problem 3-2"]=<<'EOS'
def say s, t="Goodbye "
# Hint: You can ignore a warning.
s = "#{s}#{t}"
t + "world"
end
puts say :Hello
EOSCODES["Problem 3-3"]=<<'EOS'
def say
"Hello world" if
false && false
# Hint: No hint!
end
puts say
EOSCODES["Extra 1"]=<<'EOS'
Hello = "Hello"
# Hint: Stop the recursion.
def Hello
Hello() +
" world"
end
puts Hello()
EOSCODES["Extra 2"]=<<'EOS'
s = ""
# Hint: https://techlife.cookpad.com/entry/2018/12/25/110240
s == s.upcase or
s == s.downcase or puts "Hello world"
EOSCODES["Extra 3"]=<<'EOS'
def say
s = 'Small'
t = 'world'
puts "#{s}#{t}"
end
TracePoint.new(:line){|tp|
tp.binding.local_variable_set(:s, 'Hello')
tp.binding.local_variable_set(:t, 'Ruby')
tp.disable
}.enable(target: method(:say))
say
EOSrequire'timeout'CHARS=('0'..'9').to_a+('a'..'z').to_a+('A'..'Z').to_a+%w( ! ? # % & | + - * / ^ ' . , < > = ~ $ @ _ " : ` \\ ; )+[' ',"\n","Dz"]CODES.eachdo|name,code|putsputs"#{name}"putsTime.now(0...code.length).eachdo|i|putc'.'CHARS.eachdo|char|code_inserted=code.clone.insert(i,char)File.open("code.rb","w"){|f|f.puts(code_inserted)}beginTimeout.timeout(1)doresult=`ruby code.rb 2>/dev/null`ifresult=="Hello world\n"putsputs'-----'putscode_insertedputs'-----'endendrescueTimeout::Errorendendendend
トップレベルで make_tarai を定義すると、定義式の中の self は main になります。define_method は Module クラスのメソッドなので、一般的には module ... end か class ... end の中でしか使えないのですが、main には同名のシングルトン・メソッドが定義されていて、実行すると、Object クラスにメソッドが登録されます。
[1]pry(main)>Post.find(1).tagsPostLoad(0.4ms)SELECT`posts`.*FROM`posts`WHERE`posts`.`id` = 1 LIMIT 1
ActiveRecord::HasManyThroughOrderError: Cannot have a has_many :through association 'Post#tags' which goes through 'Post#post_tags' before the through association is defined.
from /mnt/e/Development/gunplus/vendor/bundle/ruby/2.5.0/gems/activerecord-5.2.3/lib/active_record/reflection.rb:943:in `check_validity!'
require'rails_helper'RSpec.describePost,type: :modeldodescribe'#create'dolet!(:user){create(:user)}context'can save'doit'is valid with title'doexpect(build(:post,user_id: 1)).tobe_validendendcontext'can not save'doit'is invalid without title'domessages=build(:post,title: nil,user_id: 1)messages.valid?expect(messages.errors[:title]).toinclude('を入力してください')endit'is invaid without user_id'domessages=build(:post,user_id: nil)messages.valid?expect(messages.errors[:user]).toinclude('を入力してください')endendendend
Started POST "/images?image_relation=DescriptionImages&csrf_token=" for ::1 at 2019-05-01 13:25:52 +0900
Processing by ImagesController#create as */*
Parameters: {"upload"=>#<ActionDispatch::Http::UploadedFile:0x00007fbcffb81848 @tempfile=#<Tempfile:/var/folders/m0/h9_nmc1n5lg1ghdq5s4_4jc40000gn/T/RackMultipart20190501-49423-16e02tc.png>, @original_filename="pop_reiwa_hatsu.png", @content_type="image/png", @headers="Content-Disposition: form-data; name=\"upload\"; filename=\"pop_reiwa_hatsu.png\"\r\nContent-Type: image/png\r\n">, "ckCsrfToken"=>"xJ5fKnWr0dw2IepjwvbFBWvHbJ7o3TqH9qpYKyK7", "image_relation"=>"DescriptionImages", "csrf_token"=>""}
Completed 401 Unauthorized in 1ms (ActiveRecord: 0.0ms)
