[
  {"name"=>"Red", "id"=>177, "shades"=>[{"shade"=>"light", "id"=>355}], "owner"=>false},
  {"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"dark", "id"=>135}],"owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  {"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}
]

[
  {"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"dark", "id"=>135}, {"shade"=>"light", "id"=>355}],"owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  {"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"light", "id"=>137}], "owner"=>true}
]

ary = [
  {"name"=>"Red", "id"=>177, "shades"=>[{"shade"=>"light", "id"=>355}], "owner"=>false},
  {"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"dark", "id"=>135}],"owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  {"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true }
]

ary.group_by { |h| h['name']}.values.map{ |ary|
  ary.sort_by{ |h| h['owner'] ? 1 : 0 }.inject { |merged, new|
    merged.merge(new) {|key, old, new| key == 'shades' ? old + new : new }
  }
}

[
  {"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"light", "id"=>355}, {"shade"=>"dark", "id"=>135}], "owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  {"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}
]

j = [
  {"name"=>"Red", "id"=>177, "shades"=>[{"shade"=>"light", "id"=>355}], "owner"=>false},
  {"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"dark", "id"=>135}],"owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  {"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true
}
]

j.each_with_object([]) do |hsh,arr|
  if arr.last && arr.last["name"] == hsh["name"] && arr.last["owner"]
  #This clause checks if the `arr.last` is non-nil (as `nil` in ruby is `falsy`) just to ensure that `arr` is not empty, if the lookup of `"name"` key of the current yielded hash is same as the name element of the last element stored in `arr`, and the lookup of `"owner"` key is `true` then concat the `"shades"` lookup from the current yielded element to that of the last element in `arr`
    arr.last["shades"] += hsh["shades"]
  elsif arr.last && arr.last["name"] == hsh["name"]
  #This clause is similar to the previous except it does not consider the `"owner"` key lookup, and it replaces the value `"id"`, `"owner"` of the last element in `arr` with that of the `hsh` while it still concats
    arr.last["id"] = hsh["id"]
    arr.last["shades"] += hsh["shades"]
    arr.last["owner"] = hsh["owner"]
  else
    arr << hsh
  end
end

#=> [{"name"=>"Red", "id"=>195, "shades"=>[{"shade"=>"light", "id"=>355}, {"shade"=>"dark", "id"=>135}], "owner"=>true},
{"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
{"name"=>"Blue", "id"=>191, "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}]

owners, nonowners = ary.partition { |h| h["owner"] }
h = owners.each_with_object({}) { |g,h| h[g["name"]] = g }
nonowners.each { |g| h[g["name"]]["shades"] << (g["shades"].first) }
h.values

ary = [
  {"name"=>"Red",   "id"=>177, "shades"=>[{"shade"=>"light", "id"=>355}],
   "owner"=>false},
  {"name"=>"Red",   "id"=>195, "shades"=>[{"shade"=>"dark",  "id"=>135}],
   "owner"=>true},
  {"name"=>"Green", "id"=>192, "shades"=>[{"shade"=>"pale",  "id"=>135}],
   "owner"=>true},
  {"name"=>"Blue",  "id"=>191, "shades"=>[{"shade"=>"pale",  "id"=>137}],
   "owner"=>true}
]

owners, nonowners = ary.partition { |h| h["owner"] }
  # owners=>
  #  [{"name"=>"Red", "id"=>195,
  #    "shades"=>[{"shade"=>"dark", "id"=>135}], "owner"=>true},
  #   {"name"=>"Green", "id"=>192,
  #    "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  #   {"name"=>"Blue", "id"=>191,
  #    "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}],
  # nonowners=>
  #  [{"name"=>"Red", "id"=>177,
  #    "shades"=>[{"shade"=>"light", "id"=>355}], "owner"=>false}]]

h = owners.each_with_object({}) { |g,h| h[g["name"]] = g }
  #=> {"Red"=>{"name"=>"Red", "id"=>195,
  #      "shades"=>[{"shade"=>"dark", "id"=>135}], "owner"=>true},
  #    "Green"=>{"name"=>"Green", "id"=>192,
  #      "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  #    "Blue"=>{"name"=>"Blue", "id"=>191,
  #      "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}}

nonowners.each { |g| h[g["name"]]["shades"] << (g["shades"].first) }

h #=> {"Red"  =>{"name"=>"Red", "id"=>195,
  #      "shades"=>[{"shade"=>"dark","id"=>135}, {"shade"=>"light","id"=>355}],
  #      "owner"=>true},
  #    "Green"=>{"name"=>"Green", "id"=>192,
  #      "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  #    "Blue"=>{"name"=>"Blue", "id"=>191,
  #      "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}}

h.values
  #=> [{"name"=>"Red", "id"=>195,
  #     "shades"=>[{"shade"=>"dark","id"=>135}, {"shade"=>"light","id"=>355}],
  #     "owner"=>true},
  #    {"name"=>"Green", "id"=>192,
  #     "shades"=>[{"shade"=>"pale", "id"=>135}], "owner"=>true},
  #    {"name"=>"Blue", "id"=>191,
  #     "shades"=>[{"shade"=>"pale", "id"=>137}], "owner"=>true}]