轨道匹配参数中字符串的结尾

Question

I am receiving params with keys like:

params["guest1_member1"]
params["guest2_member1"]
params["guest3_member2"]
params["guest4_member2"]

Is there some regex way to get params containing _member1 ?

Something like:

params["*_member1"]

Answer 1

This should do it for you, without a regex:

params.select { |key, _value| key.ends_with?('_member') }

It's pretty self explanatory, selecting all elements from the params hash that end with '_member' .

You could also use the destructive:

params.keep_if { |key, _value| key.ends_with?('_member') }`

Though note that will permanently remove all non matches from the params.

Please note, this matches strings that end with your pattern, though you can switch to key.include?(...) if the pattern could appear anywhere in the key.

I've had a look and don't believe you can pass a regex to Hash::[] , though will be glad to be corrected if I'm wrong.

You could always use a regex within one of the above blocks, though I believe the options given are more readable.

Hope that helps regardless - let me know how you get on.