Question

I want to iterate an array inside a Ruby heredoc.

<<-BLOCK
Feature: User logs in
  In order to post content
  As an user
  I want to log in

<< Here i want to iterate scenarios >>
BLOCK

“scenarios” is an array I want to loop. For each element I want to print out:

Scenario: #{scenario}
  Given
  When
  Then

So for example if “scenarios” contains:

scenarios[0] = "User successfully logs in"
scenarios[1] = "User failed to log in"

I want the heredoc string to be:

<<-BLOCK
Feature: #{feature}
  In order to #{in_order_to}
  As #{as}
  I want #{i_want}

Scenario: User successfully logs in
  Given
  When
  And

Scenarios: User failed to log in
  Given
  When
  And
BLOCK

How do I do iterate inside a Ruby heredoc?

Answer 1

You can do it but I’m not sure it is the most readable approach:

s = <<-BLOCK
Feature: User logs in
  In order to post content
  As an user
  I want to log in

#{scenarios.map{|x|
<<-INNERBLOCK
Scenario: #{x}
  Given
  When
  Then
INNERBLOCK
}}

BLOCK