Question

If I have an array of objects in ruby, how can I iterate over the array and update the object?

example:
test_arr has the following value: (fetched by a find_by_sql)

test_arr = [
  {"id"=>1024, "value"=>"9999"},
  {"id"=>1025, "value"=>"9999"} 
]

test_arr.map{|r| r.value="1111"}

returns
[“1111”, “1111”]

I need something like: (after update)

[{"id"=>1024, "value"=>"1111"}>,
{"id"=>1025, "value"=>"1111"}>]

Any help would be greatly appreciated.

Answer 1

You must use each, because map is returning a changed array. each is iterating the array.

test_arr.each{|r| r.value="1111"}

With

test_arr.map{|r| r.value="1111"}

You return a changed array, the content is the result of the block (in the example it is “1111”). With map! the array is modified.

You may also use:

test_arr.map{|r| 
  r.value="1111"   # modify r
  r                # return r - you are replacing r with r
}

But as already mentioned: each will be better.