ruby-on-rails - Rails - 如何在文本字段中执行 If 和 else 语句

Question

我正在尝试在此文本字段中使用以下值执行 if 和 else 语句:

<%= f.text_field :rating, :size => 1, :min => 1, :max => 6, :value => if vind.ratings == 0 else vind.rating_score/vind.ratings, :type => 'range', :step => '1', :id => "#{vind.id}" %>

我看到这个错误:

SyntaxError in Kategoris#show

Showing C:/Rails/konkurranceportalen/app/views/kategoris/_rating.html.erb where line #3 raised:

C:/Rails/konkurranceportalen/app/views/kategoris/_rating.html.erb:3: syntax error, unexpected keyword_else, expecting keyword_then or ';' or '\n'
...ue => if vind.ratings == 0 else vind.rating_score/vind.ratin...
...                               ^
C:/Rails/konkurranceportalen/app/views/kategoris/_rating.html.erb:3: syntax error, unexpected ',', expecting ')'
...vind.rating_score/vind.ratings, :type => 'range', :step => '...
...                               ^

Answer 1

我通常使用速记，像这样:

:value => ( vind.ratings == 0 ? 0 : vind.rating_score/vind.ratings )