Find same values between an array and an active record variable in ruby

Question

Should be an easy one and might have over complicated the title somewhat.

I have a variable that contains records:

@record = Records.all

and an array that holds some task_id's:

@array #has for e.g. [1,2,3]

What i want to do check the task_id column of the list of records in @records to see if they contain any of the numbers in the array. If they do then i want those numbers to be put into another array.

i know this is simple but i keep getting confused along the way as im quite new to ruby syntax.

Bohdan · Accepted Answer · 2011-10-04 13:34:59Z

6

This should work for you:

@records.map(&:task_id) & @array

This builds the intersection of the two lists (task_ids and array). You can try this example at the console (I hope this helps to clear up how it works):

irb(main):008:0> a =  [1,2,3,4]
=> [1, 2, 3, 4]
irb(main):009:0> b = [3,4,5,6]
=> [3, 4, 5, 6]
irb(main):010:0> a & b
=> [3, 4]

edited Oct 4, 2011 at 13:34

Bohdan

8,4187 gold badges44 silver badges54 bronze badges

answered Oct 4, 2011 at 13:11

Matt

17.7k7 gold badges60 silver badges72 bronze badges

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

1 Comment

SD1990 Over a year ago

im getting a wrong number of arguments(1 for 0) error with this one.

Collectives™ on Stack Overflow

Find same values between an array and an active record variable in ruby

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related