CODEWITHSUNDEEP
ruby-on-railsrubyxmlhttp
Rohit Kumar
Rohit Kumar

Reputation: 85

send xml file on get request ruby

I want to send an XML file when get request is made

here is my my xml file 

<forms>
<form url="https://opendatakit.appspot.com/formXml?formId=CascadingSelect">Cascading Select Form</form>
<form url="https://opendatakit.appspot.com/formXml?formId=widgets">Widgets</form>
</forms>

this is my url

http://localhost:3000/forms/formlist

here is my ruby controller to send a xml

respond_to :xml
def formlist
   respond_to do |format|
     format.xml {//what should I write here to send formlist.xml}
   end
end

here is route.rb

get 'forms/formlist' => 'forms#formlist'

but its not sending xml file giving error code something 422

Please help me

Thanks in advance.

Upvotes: 0

Views: 957

Answers (2)

7stud
7stud

Reputation: 48589

respond_to do |format|
  format.xml {//what should I write here to send formlist.xml}
end

You don't have to write anything between the braces--if your xml file has the correct name.

The route:

First, your route can be simply:

get "forms/formlist"

By default, rails assumes that a route has the format controller/action.

The action:

Your formlist() action can simply look like this:

 def formlist
    respond_to :xml  
 end

The respond_to line is a shortcut for:

respond_to do |format|
   format.xml {}
end

In either case, your action will only respond to requests for an xml file; requests for other file types will produce an UnknownFormat error.

The view:

Then create the xml file here:

app/views/forms_controller/formlist.xml.erb

If you don't have any ruby code in your xml file, you can omit the .erb extension.

The url:

To request the xml file, you can use the url:

http://localhost:3000/forms/formlist

...and specify the following header in the request:

Accept: text/xml

For instance:

curl --header 'Accept: text/xml' http://localhost:3000/forms/formlist

Or, as rubykid posted, you can use the url:

http://localhost:3000/forms/formlist.xml

For instance:

 curl http://localhost:3000/forms/formlist.xml

In either case, rails understands that the request is asking for an xml file.

respond_to():

By default, an action renders an html file named:

app/views/some_controller/action_name.html.erb

The default rendering can be changed with respond_to() and/or render().

For example, respond_to :xml will render the file:

app/views/some_controller/action_name.xml.erb

...which in your case will be:

app/views/forms_controller/formslist.xml.erb

If you want to render a different xml file, only then do you need to use the block form of respond_to() and write something inside the braces:

respond_to do |format|
   format.xml {render ...}
end

In that case, see the Rails Guide on rendering for what you can do with render().

For completeness sake, the shortcut:

respond_to :xml, :json

...is equivalent to:

respond to do |format|
  format.xml {}
  format.json {}
end

Another option:

If the xml file is a static file, i.e. its content never changes, and you want to make it publicly available to anybody, you can put it in the public/ folder. For instance, if you name the xml file:

public/data.xml

...then anyone can request the xml file with the url:

http://localhost:3000/data.xml

Upvotes: 1

atomdev
atomdev

Reputation: 321

  1. Add .xml to url: http://localhost:3000/forms/formlist.xml

  2. Then simply render your file:

    def formlist respond_to do |format| format.xml { render '/path/to/formlist.xml' } end end

  3. Instead of adding .xml to url you can write your route as this:

    get 'forms/formlist' => 'forms#formlist', defaults: { format: 'xml' }

    so every request without MIME type will be interpreted as xml request

Upvotes: 2

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