How to create variables names with iteration and interpolation? [duplicate]

Question

Suppose there is an association (bibliography) between writers and books and one of the writers, John Pencil, wrote 16 books. Fixture bibliography.yml lists all the books as follows:

association_1:
    writer: john_pencil
    book: book_1

association_2:
    writer: john_pencil
    book: book_2

...

I need to test that the home page shows the whole list of J.P.'s books.
Thus if I could use somehow interpolation in the setup method of the test, I could do as follows:

(1..16).each do |num|
    book_#{num} = bibliography("association_#{num}".to_sym).book
end

then I could test that the books list is present as follows:

(1..16).each do |num|
    assert_select "td.book_isdn", book_#{num}.isdn
    assert_select "td.book_title", book_#{num}.title
    assert_select "td.book_genre", book_#{num}.genre
    assert_select "td.book_author", book_#{num}.author  
end

Of course, I cannot use book_#{num} and I am wondering if I can manage with some expedient to make interpolation work as I did for "association_#{num}".to_sym

Is there any reason you can't just use an array?

Sara Fuerst
– Sara Fuerst

2017-01-20 16:56:45 +00:00
Commented Jan 20, 2017 at 16:56 — Sara Fuerst
– Sara Fuerst, Commented Jan 20, 2017 at 16:56

Sergio Tulentsev · Accepted Answer · 2017-01-20 16:57:47Z

4

Yeah, don't do that. Instead, create an array of books and use its elements.

books = (1..16).map do |num|
  bibliography("association_#{num}".to_sym).book
end

Then

books.each do |book|
  assert_select "td.book_isdn", book.isdn
  assert_select "td.book_title", book.title
end

answered Jan 20, 2017 at 16:57

Sergio Tulentsev

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