Solved

Find class from string

Posted on 2008-10-21
3
309 Views
Last Modified: 2013-11-13
I have many classes (models) called (something)Configuration.

I have a variable named "whatToDo"

Where whatToDo = "sendConfiguration"

What I want to do is    whatToDo.find_by_sql(sql)

It works if I write it sendConfiguration.find_by_sql(sql) but not whatToDo.find_by_sql(sql) where whatToDo = "sendConfiguration". Is there a method that finds a class from a string?
0
Comment
Question by:maxbillys
  • 2
3 Comments
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 22768080
you would need to do WhatToDo.find_by_sql(sql) with a capital W at the start?

This would define the model.
0
 
LVL 14

Accepted Solution

by:
wesgarrison earned 30 total points
ID: 22768253
See const_get()
http://www.ruby-doc.org/core/classes/Module.html#M001712
whatToDo = "sendConfiguration"  # class name
class_object = Object.const_get(whatToDo)
class_object.find_by_sql(...)

Open in new window

0
 
LVL 10

Assisted Solution

by:Andrew Doades
Andrew Doades earned 20 total points
ID: 22768622
Sorry, I thought you was trying to find something from the database.

I just added some code into my project and got a result, see attached.

I changed my database and model to  sendConfiguration, to try and help
action = Object.const_get(" sendConfiguration")
action.find_by_sql()

Open in new window

0

Featured Post

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Ruby OO Design - General Knowledge 3 313
What is ::IGNORECASE in Ruby 2 467
What is 'f.hidden_field' for? 1 306
PHP vs Ruby on Rails 3 486
I recently rediscovered rails when I needed a holiday project and decided to build a management dashboard for the company where I work.  With it being a project done in my free time, I could focus my time on learning the basics rather than trying to…
Article by: narshlob
If you've ever programmed in Ruby and have come across either a proc or a lambda, you might have been wondering what the difference is between the two and when you would use one over the other. This article will try to explain the difference between…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question