Ruby on Rails: error on concatenating string datatype field and boolean datatype field

Question

I'm working on a Rails HAML View and I'm trying to display together two fields: the first one is String datatype and the other one is Boolean datatype, I'm trying with this line of code:

      %td=students.name + " " + students.status ? '(Passed)' : ''

As you can see I'm using a ternary operator to cast true to Passed and false to blank.

However, I'm getting this error:

Also, if I avoid ternary operator I got the same output error.

My question is: how can I cast these two fields and at the same time show "passed" if it is true?

Thanks a lot

To be clear, you are not trying to concatenate a string with a boolean (that's not valid in ruby). Your problem here is all about the order of operation, namely, trying to do multiple things in one line without brackets. — Tom Lord
– Tom Lord, Commented Aug 26, 2022 at 15:40
As a best practice, consider moving your strings into your locale file, rather than hard-coding English strings in your views. — user229044
– user229044 ♦, Commented Aug 26, 2022 at 15:52

mechnicov · Accepted Answer · 2022-08-26 16:21:28Z

1

May be interpolation instead of concatenation?

And don't need ternary operator in that case because nil.to_s == ""

%td="#{students.name} #{'(Passed)' if students.status}"

or even just

%td #{students[:name]} #{'(Passed)' if students[:status]}

edited Aug 26, 2022 at 16:21

answered Aug 26, 2022 at 15:46

mechnicov

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1 Comment

user229044 Over a year ago

If you're going to wrap the entire line in ", then drop the " and the =, they are redundant: %td #{students[:name]} #{'(Passed)' if students[:status]}

Les Nightingill · Accepted Answer · 2022-08-26 14:59:07Z

0

try this:

%td=students.name + " " + (students.status ? '(Passed)' : '' )

answered Aug 26, 2022 at 14:59

Les Nightingill

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1 Comment

htamayo Over a year ago

thank you so much @LesNightingill it works as expected, all the best

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