如何在Ruby中添加到数组
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How to add to array in Ruby
提问by holden
I'm sure this is simple but I can't seem to get it:
我确定这很简单，但我似乎无法理解：
Works:
作品：
@build1 = Booking.build_booking('2009-06-13',3,2,18314)
@build2 = Booking.build_booking('2009-06-13',3,4,18317)
@build = @build1 + @build2
What I want to work...
我想做什么...
#for item in @cart.items do
# @build << Booking.build_booking('2009-06-13',3,2,18314)
#end
Doesn't work either...
也不行...
#(1..3).each do |i|
# @build << Booking.build_booking('2009-06-13',3,2,18314)
#end
回答by Magnar
I prefer using the wonderful array-methods that ruby has to offer over a for loop:
我更喜欢使用 ruby 在 for 循环中提供的美妙的数组方法：
@build = @cart.items.map { |item| Booking.build_booking('2009-06-13',3,2,18314) }
回答by Shadwell
For the two iterating examples you'd need to set @buildprior to calling <<on it.
对于两个迭代示例，您需要@build在调用<<它之前进行设置。
I'm not sure what build_bookingis returning but if it's an array (I'm guessing from the first, working, example) then you'd probably want to add the result of build_bookingto @build. E.g.
我不确定build_booking返回的是什么，但如果它是一个数组（我从第一个，工作，示例中猜测）那么您可能想要将结果添加build_booking到@build. 例如
@build = []
for item in @cart.items do
@build += Booking.build_booking('2009-06-13',3,2,18314)
end
回答by dylanfm
@buildwill need to be an array, or an object that responds to <<, for @build <<to work.
@build将需要的阵列，或一个对象，该响应<<，对@build <<工作。
When you've done:
完成后：
@build = @build1 + @build2
What is the value of @build?
的价值是@build什么？
回答by Subba Rao
@build = []
for item in @cart.items do
@build += Booking.build_booking('2009-06-13',3,2,18314)
end
@build.flatten!
flatten will will work even Booking.build_booking is returning an array of bookings
即使 Booking.build_booking 返回一系列预订，flatten 也会起作用
回答by tadman
The quick approach, though, would be to simply declare the array to combine the two elements:
不过，快速的方法是简单地声明数组以组合两个元素：
@build = [ @build1, @build2 ]
I'd use an approach like Magnar, though, which is much more concise.
不过，我会使用像 Magnar 这样的方法，它更简洁。
