Bug #10023: Hash#merge fails duplicating objects

• Status: Rejected
• Assignee: -
• Target version: -
• ruby -v: 2.1.2
• Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN

[coyote (Alexey Babich)]

Here is an example in IRB (ruby 2.1.2):

A={b:{}}
=> {:b=>{}}
c=A.merge({c: {d: 'e'}})
=> {:b=>{}, :c=>{:d=>"e"}}
c[:b][:d] = "f"
=> "f"
A
=> {:b=>{:d=>"f"}}

Every key, value pair is expected to be duplicated during the merge? Please, investigate if this is a bug

[coyote (Alexey Babich)]

Please, also note that Rails' deep_merge does not help

[coyote (Alexey Babich)]

The same with duplication

c=A.dup #same .clone
=> {:b=>{}}
c.merge!({c: {d: 'e'}})
=> {:b=>{}, :c=>{:d=>"e"}}
c[:b][:d] = 'bug'
=> "bug"
A
=> {:b=>{:d=>"bug"}}

[coyote (Alexey Babich)]

Please, note that only Rails' deep_dup seems helpful to workaround the issue

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Rejected

Not a bug.
A[:b] and c[:b] refer the same object.
Check its object_id.