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I am using ActiveRecord with Rails 3.
I defined scopes in my model. How can I get the list of all scopes of that model?
Previously I could use Model.scopes
OR
Can I check a scope is defined or not? Something like Model.scope_defined?("scope_name")
Thanks in advance.
634
Scopes are used to assign complex ActiveRecord queries into customized methods using Ruby on Rails. Inside your models, you can define a scope as a new method that returns a lambda function for calling queries you're probably used to using inside your controllers.
Scopes are custom queries that you define inside your Rails models with the scope method. Every scope takes two arguments: A name, which you use to call this scope in your code. A lambda, which implements the query.
Scopes are custom queries that you define inside your Rails models with the scope method. Every scope takes two arguments: A name, which you use to call this scope in your code. A lambda, which implements the query.
Like Ruby class methods, to invoke the named scopes, simply call it on the class object. Named scopes takes two arguments; name and lambda. Use an expressive name. Lambda is a block of code.
You can see if a scope is defined or not this way
Model.send(:valid_scope_name?, :scope_name)
it will return true if it does exist and nil if it does not.
If you check the source code of valid_scope_name?, you see that you can just test it using respond_to? and then avoid the logging part.
Model.respond_to?(scope_name, true)
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