如何将哈希添加到数组？

I have a business with 2 employees. Each employee has many messages.

我有一个有2名员工的企业。每个员工都有很多消息。

When I run the command:

当我运行命令时:

business.employees.each do |employee|
 puts employee.messages.group_by &:from
end

I get the correct output:

我得到了正确的输出:

{100=>[#<Message id: 3, content: "Needs more training", from: 100, employee_id: 1>]}

{101=>[#<Message id: 2, content: "Very lazy.", from: 101, employee_id: 2>], 102=>[#<Message id: 1, content: "Fantastic.", created_at: "2014-03-03 12:01:28", updated_at: "2014-03-03 12:01:28", from: 102, employee_id: 2>]}

But I don't want to puts the output I want to add each hash to an array so that I can display them.

但我不想把我想要的输出添加到数组中,以便我可以显示它们。

So when I run the command

所以当我运行命令时

grouped_messages = []
business.employees.each do |employee|
 grouped_messages << employee.short_messages.group_by &:from
end

I get the error: expecting keyword_end

我收到错误:期待keyword_end

3 个解决方案

#1

You are missing parentheses, this should work:

你缺少括号,这应该工作:

grouped_messages = []
business.employees.each do |employee|
 grouped_messages << employee.short_messages.group_by(&:from)
end

A better alternative should be to use map:

一个更好的选择应该是使用map:

grouped_messages = business.employees.map do |employee| 
  employee.short_messages.group_by &:from
end

#2

Don't omit the parentheses:

不要省略括号:

grouped_messages << employee.short_messages.group_by(&:from)

#3

-1

Parenthesis is missing around &:from which is causing error. Change it it to (&:from)

&附近缺少括号:从中导致错误。将其更改为(&:from)

#1