def replaceranked
oldrankings = Question.where(:rank => [1,2,3,4,5])
# Mocking the creation of a new top 5
newrankings = Question.where(:id => [4,5,6,7,8])
newrankings.each_with_index |a, i|
a.rank = i+
end
oldids = oldrankings.map{|a| a.id}
newids = newrankings.map{|a| a.id}
simlarities = oldids & newids
oldrankings.each_with_index do |a, i|
if !(similarities.includes?(a.id))
newrankings.push(a)
oldrankings.delete_at(i)
end
end
oldrankings.map{|a| a.rank = nil}
updatedtopfive = newrankings | oldrankings
updatedtopfive.map{|a| a.save}
end
SyntaxError：（irb）：275：语法错误，意外'}'
（irb）：280：语法错误，意外的tIDENTIFIER，期待'：'
... newrankings.push（a）oldrankings.delete_at（i）：next}
...... ^
（irb）：280：语法错误，意外'：'，期待'}'
...... h（a）oldrankings.delete_at（i）：next}
...... ^
（irb）：284：语法错误，意外的keyword_end，期待'}'
来自lib / rails / commands / console.rb：44：in start'
from lib/rails/commands/console.rb:8:in start'
来自lib / rails / commands.rb:23:in <top (required)>'
from script/rails:6:in require'
来自script / rails：6：in''
Id:Integer
Content:String
Rank:Integer #Normally Null unless ranked in which case you'll have a rank of 1 to 5