如何使用 nil：NilClass 的未定义方法"[]"遍历多维数组？

Question

我有这样的数组数据：

work_list = {
"data": {
"1": {
"team": "Design", 
"members": nil, 
"workload": {
"process": {
"total": 50, 
"finish": 36, 
"un_finish": 14, 
}
} 
},
"2": {
"team": "Account", 
"members": 15, 
"workload": {
"process": {
"total": 30, 
"finish": 20, 
"un_finish": 10, 
}
} 
}
}
}  

我想通过以下方式计算两个团队的总工作量：

list = work_list["data"]
count = 0
list.each do |num|
num.each do |details|
work = num["workload"]["process"]["total"]
count += work
end
end
puts "The total amount of works: #{count}"

这里的错误是："nil：NilClass (NoMethodError(的未定义方法'each'

Answer 1

代码的问题在于你使用:来构建哈希：

"workload": {
"process": {
"total": 50, 
"finish": 36, 
"un_finish": 14, 
}
}

这是 Ruby 中的有效语法，但此哈希的键将是符号，而不是预期的字符串，因此您需要通过符号访问此哈希的数据：

data_hash = work_list[:"data"]
count = 0
data_hash.each do |index, data|
work = data[:"workload"][:"process"][:"total"]
count += work
end
puts "The total amount of works: #{count}"

如果要使用字符串，则需要按如下方式构造哈希：

"workload" => {
"process" => {
"total" => 50, 
"finish" => 36, 
"un_finish" => 14, 
}
}

Answer 2

您是在哈希而不是数组上进行迭代

list.each do |num, info|
work = info["workload"]["process"]["total"]
count += work
end