CODEWITHSUNDEEP
rubyrescue
Matt Elhotiby
Matt Elhotiby

Reputation: 44066

Why does this rescue syntax work?

Ok so I have this method of an application I am working with and it works in production. My question why does this work? Is this new Ruby syntax?

def edit
  load_elements(current_user) unless current_user.role?(:admin)

  respond_to do |format|
    format.json { render :json => @user }   
    format.xml  { render :xml => @user }
    format.html
  end

rescue ActiveRecord::RecordNotFound
  respond_to_not_found(:json, :xml, :html)
end

Upvotes: 5

Views: 1266

Answers (4)

Dave Newton
Dave Newton

Reputation: 160261

rescues do not need to be tied to an explicit begin when they're in a method, that's just the way the syntax is defined. For examples, see #19 here and this SO question, as well as the dupe above.

Upvotes: 13

Vik
Vik

Reputation: 5961

rescue can work alone . no need of begin and end always .

You can use rescue in its single line form to return a value when other things on the line go awry:

h = { :age => 10 }
h[:name].downcase                         # ERROR
h[:name].downcase rescue "No name"

Upvotes: 2

dku.rajkumar
dku.rajkumar

Reputation: 18578

try this

def edit
  begin
    load_elements(current_user) unless current_user.role?(:admin)

    respond_to do |format|
      format.json { render :json => @user }   
      format.xml  { render :xml => @user }
      format.html
    end

  rescue ActiveRecord::RecordNotFound
    respond_to_not_found(:json, :xml, :html)
  end
end

Upvotes: -3

mikdiet
mikdiet

Reputation: 10018

rescue word is part of method definition

But in controllers better to rescue errors with rescue_from

Upvotes: 0

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