On 28 April 2016 at 16:28, gvim <[email protected]> wrote: > "Agile Web Development with Rails 5", p.76 lists a form partial which > begins: > > <%= form_for(product) do |f| %> > <% if product.errors.any? %> > <div id="error_explanation"> > <h2><%= pluralize(product.errors.count, "error") %> prohibited this > product from being saved:</h2> > > <ul> > <% product.errors.full_messages.each do |message| %> > <li><%= message %></li> > > It is correct but I'm confused about the first line as I understood that > control structures begin with <% as in the 2nd line and that <%= is reserved > for inserting values and calling formatting functions.
That is almost correct. Lines with <% are evaluated but nothing is inserted into the page. Lines with <%= are evaluated and the returned value (string) is inserted into the page. Since form_for has to insert the form tag into the page then it has to be <%= Colin -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAL%3D0gLsvCAGN%3Dh%3DtELV9R%3DmYMhne_5T%3D_Yjatm%3Dw7v7hfQ8VuA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
