How can I limit the amount of words displayed from a Ruby string?

the Ruby code is below:

<%= product.advert_text -开发者_运维技巧%>

What script can limit the amount of words?

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Since you are working with Rails, you can use the truncate method.

So, something like:

<%= truncate(product.advert_text, :length => 20) -%>

The :length option sets the # of characters to truncate at & will add ellipses at the end (you can override the default ellipses with the :omission option - see the documentation on my link).

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If you want to limit to a certain number of words, the easiest way is going to be to split on space and then join the desired number of words back into a string.

<%=product.advert_text.split.slice(0, limit).join(" ") -%>