CODEWITHSUNDEEP
ruby-on-railsarrayshash
bonum_cete
bonum_cete

Reputation: 4962

combine two arrays of possibly different sizes into hash

How can I combine these two arrays in to a hash. They may be of equal sizes or not.

@status_array = ["ready", "required", "processing", "approval", "live"]

@part_milestones = [#<Milestone id: 657707, data_type: "ready">, #<Milestone id: 657708, data_type: "required">, #<Milestone id: 657709, data_type: "approval">]

They are sorted already. I just need the hash to deal with the "blanks" properly like so:

{"ready"=>#<Milestone id: 657707, data_type: "ready">, "required"=>#<Milestone id: 657708, data_type: "required">, "processing"=>nil, "approval"=>#<Milestone id: 657709, data_type: "approval">, "live"=>nil}

Upvotes: 1

Views: 99

Answers (3)

Sean
Sean

Reputation: 983

@part_milestones.sort_by &:data_type should do the trick

Upvotes: -1

usha
usha

Reputation: 29349

You can use zip to merge the arrays into two dimensional and then use the following to convert into hash

Hash[@status_array.zip(@part_milestones)]

Documentation for Hash[]

UPDATE:

just realized that its not a one to one mapping

hash = {}
@status_array.each do |status|
   hash[status] = @part_milestone.find{|milestone| milestone.data_type == status}
end

Upvotes: 1

Rodrigo
Rodrigo

Reputation: 4802

The cleanest way I know to do this is:

hash = @status_array.inject({}) do |result_hash, status| 
  result_hash[status] = @part_milestones.select { |milestone| milestone.data_type == status }.first
  result_hash
end

Upvotes: 1

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