How to merge array of hashes based on hash value but not merge values instead override - ruby

Question

I have an array of hashes like this:
[
{ name: 'Pratha', email: 'c#f.com' },
{ name: 'John', email: 'j#g.com' },
{ name: 'Clark', email: 'x#z.com' },
]
And this is second group array of hashes:
[
{ name: 'AnotherNameSameEmail', email: 'c#f.com' },
{ name: 'JohnAnotherName', email: 'j#g.com' },
{ name: 'Mark', email: 'd#o.com' },
]
What I want is, merge these two arrays into one, merge based on :email and keep latest (or first) :name.
Expected Result (latest name overrided):
[
{ name: 'AnotherNameSameEmail', email: 'c#f.com' },
{ name: 'JohnAnotherName', email: 'j#g.com' },
{ name: 'Mark', email: 'd#o.com' },
{ name: 'Clark', email: 'x#z.com' },
]
or (first name preserved)
[
{ name: 'Pratha', email: 'c#f.com' },
{ name: 'John', email: 'j#g.com' },
{ name: 'Mark', email: 'd#o.com' },
{ name: 'Clark', email: 'x#z.com' },
]
So, basically, I want to group by :email, retain one :name, drop dupe emails.
The examples found on SO is creates an array of values for :name.
Ruby 2.6.3

Answer 1

Maybe you could just call Array#uniq with a block on email key of the concatenation (Array#+) of the two arrays:
(ary1 + ary2).uniq { |h| h[:email] }

Answer 2

a1 = [
{ name: 'Pratha', email: 'c#f.com' },
{ name: 'John', email: 'j#g.com' },
{ name: 'Clark', email: 'x#z.com' },
]
a2 = [
{ name: 'AnotherNameSameEmail', email: 'c#f.com' },
{ name: 'JohnAnotherName', email: 'j#g.com' },
{ name: 'Mark', email: 'd#o.com' },
]
Let's first keep the last:
(a1+a2).each_with_object({}) { |g,h| h.update(g[:email]=>g) }.values
#=> [{:name=>"AnotherNameSameEmail", :email=>"c#f.com"},
# {:name=>"JohnAnotherName", :email=>"j#g.com"},
# {:name=>"Clark", :email=>"x#z.com"},
# {:name=>"Mark", :email=>"d#o.com"}]
To keep the first, do the same with (a1+a2) replaced with (a2+a1), to obtain:
#=> [{:name=>"Pratha", :email=>"c#f.com"},
# {:name=>"John", :email=>"j#g.com"},
# {:name=>"Mark", :email=>"d#o.com"},
# {:name=>"Clark", :email=>"x#z.com"}]