Ruby - Merge an Array into a Hash -

i have array looks this:

array = [[:foo, :bar], [:foo, :baz], [:baz, {a: 1, b: 2}], [:baz, {c: 1, d:2}]] 

and need turn hash looks this:

{:foo =>[:bar, :baz], :baz => {a: 1, b: 2, c: 1, d: 2}} 

this code have far:

def flatten(array)   h = {}   array.each_with_object({}) |(k, v), memo|     if v.is_a?(hash)       memo[k] = h.merge!(v)     else       # goes here?     end   end end 

when used so:

flatten(array) 

outputs:

{baz => {:a => 1, :b => 2, :c => 1, :d => 2}} 

may please point me in right direction? appreciated.

def convert(arr)   arr.each_with_object({}) |a,h|     h[a.first] =               case a.last       when hash         (h[a.first] || {}).update(a.last)       else         (h[a.first] || []) << a.last       end   end end  convert array   #=> {:foo=>[:bar, :baz], :baz=>{:a=>1, :b=>2, :c=>1, :d=>2}}