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keating/keating_test.rb

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Keating's Test

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keating_test.rb

	#1. The first Test
	#The command is,
	#rails g migration AddPermalinkToPosts permalink:string:uniq
	#In the migration file that just generated, I will add some code, then the migration file should be,
	classAddPermalinkToPosts <ActiveRecord::Migration
	defchange
	add_column:posts,:permalink,:string
	add_index:posts,:permalink,unique:true

	Post.select("id,title").eachdo \|post\|
	Post.find(post.id).update_attribute:permalink,"#{post.id}-#{post.title.split(' ').join('-')}"
	end
	end
	end


	#2. The second Test
	deffirst_methodnumber
	# change the number to a arrary, and reverse the elements' order
	arr=number.to_s.split("").reverse
	# change value of the elements that have a even index
	0.upto(arr.length -1).eachdo \|i\|
	ifi %2 ==0
	two_digit_array=(arr[i].to_i *2).to_s.split("")
	arr[i]=two_digit_array[0].to_i +two_digit_array[1].to_i
	end
	end
	# sum of the elements, modal with 10, and compare the result with 0
	arr.inject(0){\|sum,x\|sum +x.to_i} %10 ==0
	end

	putsfirst_method(7992739871)

	# this method is very like the first one
	defsecond_methodnumber
	arr=number.to_s.split("").reverse
	0.upto(arr.length -1).eachdo \|i\|
	ifi %2 ==0
	two_digit_array=(arr[i].to_i *2).to_s.split("")
	arr[i]=two_digit_array[0].to_i +two_digit_array[1].to_i
	end
	end
	num=arr.inject(0){\|sum,x\|sum +x.to_i} %10
	number.to_s +num.to_s
	end

	putssecond_method(7992739871)


	#3. The Third Test
	#First, add a unique constraint for service_id and line_item_id
	classAddUQServiceLineItemToPosts <ActiveRecord::Migration
	defup
	ActiveRecord::Base.connection.execute("ALTER TABLE payments ADD CONSTRAINT uq_service_line_item UNIQUE (service_id, line_item_id)")
	end

	defdown
	ActiveRecord::Base.connection.execute("ALTER TABLE payments DROP index uq_service_line_item")
	end
	end

	#Then, add a with method for Payment, the most important thing here is adding a lock
	classPayment <ActiveRecord::Base
	belongs_to:service

	defself.withhash
	Payment.transactiondo
	payment=Payment.where(hash).first_or_create
	payment.lock!
	yield(payment)
	end
	end
	end

Movatterモバイル変換

keating/keating_test.rb