$ rails console
Loading development environment (Rails 3.2.11)
irb(main):001:0> html_escape({:a=>1, :b=>"my str"})
NoMethodError: undefined method `html_escape' for main:Object

helper.send(:html_escape, '123')
helper.pluralize 3, 'user'

include ERB::Util

> helper.send(:html_escape, '{ a: 1, b: "my str" }')
"{ a: 1, b: "my str" }"