CODEWITHSUNDEEP
ruby-on-railsrubyarraysloops
hellomello
hellomello

Reputation: 8587

Ruby on Rails: iterating through array with specific index?

How do I iterate through an array if I have the specific index?

@lv = {'apple' => ['round', 'red'], 'name' => ['tags', 'more tags']}

if params[:value]
    @lv.each do |key, tags|
        if params[:value] == key
            tags.each_with_index do |tag, index|
                ... should display round and red?
            end
        end
    end
end

I have an array @lv and I want to be able to get the values if there's a parameter associated with it. example:

someURL.com/?value=0 Then this is supposed to get the key apple. I want to get the values from apple which should be round and red. My logic in the above codes is wrong, but I'm trying to figure out what is the syntax to call out the correct key to iterate?

Upvotes: 0

Views: 1137

Answers (2)

Joshua Scott
Joshua Scott

Reputation: 663

This seems like a lot of effort to make it work this way. Why not change the view so you can select the key name:

http://example.com/?value=apple instead of http://example.com?value=0

then you can change your controller code to:

@tags = @lv[params['value']]

Then just iterate through @tags in your view, or whatever else you're trying to do with the list of tags.

Upvotes: 1

Dave Newton
Dave Newton

Reputation: 160191

This makes no sense; @lv is a map, not an array. Using numeric indices on a map is strange.

You can rely on insertion order in Ruby 1.9+, so @lv[@lv.keys[params[:value].to_i]] would actually retrieve what you want, but IMO it's semantically sketchy.

@lv[@lv.keys[params[:value].to_i]].each_with_index do |tag, index|
  ...
end

I'd also recommend using at least one intermediate variable to clean up that expression.

Upvotes: 1

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