Rails: Remove element from array of hashes

Question

I have the following array:

 array = [{"email"=>"[email protected]", "name"=>"Test"},
          {"email"=>"[email protected]", "name"=>"Test A"},
          {"name"=>"Test B", "email"=>"[email protected]"},
          {"email"=>"[email protected]", "name"=>"Test C"},
          {"name"=>"Test D", "email"=>"[email protected]"},
          {"email"=>"[email protected]"},
          {"name"=>"Test F", "email"=>"[email protected]"}]

I have a list of "blacklist" emails, for instance:

 blacklist = ["[email protected]"]

I want to do something like this:

 array - blacklist 
 # => should remove element {"email"=>"[email protected]", "name"=>"Test C"}

Surely there is a sexy-Ruby way to do this with .select or something, but I haven't been able to figure it out. I tried this to no avail:

 array.select {|k,v| v != "[email protected]"} # => returns array without any changes

mu is too short · Accepted Answer · 2019-03-07 18:30:44Z

54

I think you're looking for this:

filtered_array = array.reject { |h| blacklist.include? h['email'] }

or if you want to use select instead of reject (perhaps you don't want to hurt anyone's feelings):

filtered_array = array.select { |h| !blacklist.include? h['email'] }

Your

array.select {|k,v| ...

attempt won't work because array hands the Enumerable blocks a single element and that element will be a Hash in this case, the |k,v| trick would work if array had two element arrays as elements though.

edited Mar 7, 2019 at 18:30

answered Oct 22, 2011 at 2:32

mu is too short

436k71 gold badges863 silver badges822 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

MorningHacker Over a year ago

brilliant! thanks for the quick turnaround :) in fact, you answered so quickly that I can't even "accept" the answer on SO's system.

Darren Cato Over a year ago

there is also an exclude function that is and alias for !include

mu is too short Over a year ago

@Darren: The only downside is that exclude? is a Rails extension and that would lead into double negative territory :) I'd probably go with the reject/include?.

Alexander Pogrebnyak · Accepted Answer · 2011-10-22 02:33:17Z

2

How about

array.delete_if {|key, value| value == "[email protected]" }

answered Oct 22, 2011 at 2:33

Alexander Pogrebnyak

45.8k10 gold badges111 silver badges123 bronze badges

2 Comments

PeterWong Over a year ago

similar to @mu is too short's select, it should be array.delete_if {|hash| hash["email"] == "[email protected]"}

tokland Over a year ago

delete_if works inplace (usually not a good idea), the OP seems to want a new array.

Collectives™ on Stack Overflow

Rails: Remove element from array of hashes

2 Answers 2

3 Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related