create object from class name as string in ruby

Question

I have a model source (name, url, method) The program parses the source's url for data. Now I have differen classes for parsing different types of urls: rss, xml, ogdata ...

So I have a common interface

new(url) //Parses the url

getTitle() //Get the title of the data

getPrice() //Get the price

And I have four classes rss, xml, ogdata. These classes are in seperate files. The idea is to add more classes as I discover different types of pages. I want to initiate the right classes for the url.

method=source.method //NOw I want to create a new class of the name specified in method

parser=Rss.new(source.url)//Instead of this //Something like parser=.new(source.url)

Give this a try: stackoverflow.com/questions/5302187/ruby-string-to-class-name — vee
– vee, Commented Dec 26, 2013 at 7:11

thekindofme · Accepted Answer · 2013-12-26 07:48:49Z

0

You can try using const_get.

Ex:-

Kernel.const_get("YourClassNameHere").new

*Kernel.const_get("YourClassNameHere")* will get you the class. And you can use it to instantiate new instances of the class.

answered Dec 26, 2013 at 7:48

thekindofme

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Jin Lim · Accepted Answer · 2021-02-11 17:26:05Z

0

irb(main):081:0> User.name
=> "User"

then

"User".constantize.new(name: 'David')

or

User.name..constantize.new(name: 'David')

answered Feb 11, 2021 at 17:26

Jin Lim

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