Ruby-on-rails – in Ruby on Rails, what is the kENSURE and kEND in error messages

rubyruby-on-rails

In Ruby on Rails, I sometimes get an error on the page as:

compile error
/Users/jian/ror/shov2/app/views/stories/index.html.erb:13:
syntax error, unexpected kENSURE,
expecting ')'
/Users/jian/ror/shov2/app/views/stories/index.html.erb:15:
syntax error, unexpected kEND,
expecting ')'

the kEND, i can guess that it is End… so it means End of file but unexpected, there should be a ')'.

how about the kENSURE ?

Best Answer

The kEND constant refers to the token "end", as in what you end every code block with. An ensure block is the equivalent of a finally block in other languages.

begin
  1/0
rescue ZeroDivisionError
  puts "OH SHI-"
ensure # <- THIS THING
  1/1
  puts "Whew, we're safe"
end

That's what kENSURE refers to.

It sounds like you forgot to put the closing paren at the end of either a method call or a method parameter list.

Related Solutions

Ruby-on-rails – How to “pretty” format JSON output in Ruby on Rails

Use the pretty_generate() function, built into later versions of JSON. For example:

require 'json'
my_object = { :array => [1, 2, 3, { :sample => "hash"} ], :foo => "bar" }
puts JSON.pretty_generate(my_object)

Which gets you:

{
  "array": [
    1,
    2,
    3,
    {
      "sample": "hash"
    }
  ],
  "foo": "bar"
}

R – why does this comment create a compile error on Ruby on Rails

Think of <%= as meaning "add the value of this expression to the output stream". No expression? Syntax error.

Consider

output << @stories.inspect

output <<

Tracking down how <%= is really handled in the erb source may be edifying. I found it worth the effort when I was getting started with Rails.

Best Answer

Related Solutions

Ruby-on-rails – How to “pretty” format JSON output in Ruby on Rails

R – why does this comment create a compile error on Ruby on Rails

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