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Ruby Ruby Collections Ruby Hashes Hash Methods

Mateusz Hyla
Mateusz Hyla
4,658 Points
Posted by Mateusz Hyla
Mateusz Hyla
4,658 Points

I don't understand whats wrong with merge method

HI I got error :

Bummer! The merge method was not called on the grocery_item hash.

How can this be when in code you see I call merge on grocery_item hash ?

This is documentation example :

h1 = { "a" => 100, "b" => 200 } h2 = { "b" => 254, "c" => 300 } h1.merge(h2) #=> {"a"=>100, "b"=>254, "c"=>300}

I tried to do the same like :

grocery_item.merge(calories) final_item.merge(grocery_list)

But I noticed that they dont merge at all :-p. You can see it when you inspect this hashes after merge.

Is that some kind of Bug or something else or I made somewhere mistake ?

Cheers

hash.rb 
grocery_item = { "item" => "Bread", "quantity" => 1, "brand" => "Treehouse Bread Company" }
calories = { "calories" => 100 }

grocery_item = grocery_item.merge(calories)
final_item = {}
final_item = final_item.merge(grocery_item)

2 Answers

James Hunter
James Hunter
9,804 Points

I think it's a problem with the way they check the test. You're reassigning the grocery_item variable, making it harder to track for any validator. The code will work, but it's harder for them to tell.

A simpler way, without reassigning any variables, is just to assign the result of the initial merge to the final_item variable. As in:

final_item = grocery_item.merge(calories)

That should give you a solution that will pass the tests.

Mateusz Hyla
Mateusz Hyla
4,658 Points
Mateusz Hyla
Mateusz Hyla
4,658 Points

Yeah its worked but its quite strange for me that some challanges on Treehouse has so narrow scope of possible proper answers and solutions. I hope they will build that up in future. I really like to learn with Treehouse thou :-) Thanks James ^_^

Mateusz Hyla
Mateusz Hyla
4,658 Points
Mateusz Hyla
Mateusz Hyla
4,658 Points

Even overriden doesnt work like :

final_item.merge("item" => "Bread", "quantity" => 1, "brand" => "Treehouse Bread Company" ,"calories" => 100)

Whats wrong with merge method ?