Ruby on Rails: How to check if the Model Exists

Question

I want to know how to check if the model already exists in the project or not?

When user tries to create a model programatically using the same model name, need to check if it already exists or not?

Answer 1

defined? ModelName defined? ModelName will return "constant" if model defined.

Answer 2

Since defined? is problematic (see @Jiggneshh Gohel's comment), perhaps you can check the filenames in the models dir.

files = Dir[Rails.root + 'app/models/*.rb']
models = files.map{ |m| File.basename(m, '.rb').camelize }

models.include? "User" => true

Answer 3

Another option is use exists

Return false if there is no column in the model.