CODEWITHSUNDEEP
ruby-on-railsvariable-initialization
PeterWong
PeterWong

Reputation: 16011

Initialize a multiple levels hash in rails

So I have some codes look like the following:

@foo ||= {}
@foo[:bar] ||= {}
@foo[:bar][:baz] ||= {}

I am not concerning the performance, but the cleanness. Is there a more beautiful way or better way to do so?

Upvotes: 0

Views: 399

Answers (2)

Abdullah Jibaly
Abdullah Jibaly

Reputation: 54810

{:bar => {:baz => {}}}.merge(@foo)

Upvotes: 1

Jon Gauthier
Jon Gauthier

Reputation: 25592

I think what you have is a good, terse way of writing the code, but below is another way I thought of to do the same thing. It'll still do the job, if you'd prefer to be more verbose:

if @foo.nil?
    @foo = { :bar => { :baz => {} } }
else if @foo[:bar].nil?
    @foo[:bar] = { :baz => {} }
else if @foo[:bar][:baz].nil?
    @foo[:bar][:baz] = {}
end

or

if !@foo
    @foo = { :bar => { :baz => {} } }
else if !@foo[:bar]
    @foo[:bar] = { :baz => {} }
else if !@foo[:bar][:baz]
    @foo[:bar][:baz] = {}
end

Upvotes: 0

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