判斷祖先是Ruby中的類還是模塊的方法？

Question

如果我有類如下的類，那麼如何判斷祖先是類還是模塊呢？

ActiveRecord::Base.send(:include, SomeLibrary) 

class Group < ActiveRecord::Base 
    include SomeLibrary::Core 
end 

class SubGroup < Group 

end 

ancestor_names = SubGroup.ancestors.map(&:name) 
puts ancestor_names.inspect 
    #=> [ 
    "SubGroup", "SomeLibrary::Core::InstanceMethods", "SomeLibrary::Core", 
    "Group", "ActiveRecord::Base", "SomeLibrary", "ActiveRecord::Aggregations", 
    "ActiveRecord::Transactions", "ActiveRecord::Reflection", "ActiveRecord::Batches", 
    "ActiveRecord::Calculations", "ActiveRecord::Serialization", "ActiveRecord::AutosaveAssociation", 
    "ActiveRecord::NestedAttributes", "ActiveRecord::Associations", "ActiveRecord::AssociationPreload", 
    "ActiveRecord::NamedScope", "ActiveRecord::Callbacks", "ActiveRecord::Observing", 
    "ActiveRecord::Timestamp", "ActiveRecord::Dirty", "ActiveRecord::AttributeMethods", 
    "ActiveRecord::Locking::Optimistic", "ActiveRecord::Locking::Pessimistic", 
    "ActiveSupport::Callbacks", "ActiveRecord::Validations", "Object", "Mocha::ObjectMethods", 
    "JSON::Pure::Generator::GeneratorMethods::Object", "ActiveSupport::Dependencies::Loadable", 
    "Base64::Deprecated", "Base64", "PP::ObjectMixin", "Kernel" 
] 

我希望能夠做這樣的事情：

ancestor_names.each do |name| 
    if class?(name) 
    puts "#{name} is a Class" 
    elsif module?(name) 
    puts "#{name} is a Module" 
    end 
end 

或...

SubGroup.ancestor_classes #=> only the classes in the tree 
SubGroup.ancestor_modules #=> only the modules in the tree 

它歸結爲，你如何檢查是否有物體一個課程或模塊？

Answer 1

嗯，這是什麼included_modules是，那麼你很可能尋找的是：

SubGroup.included_modules      #=> module ancestors 
SubGroup.ancestors - SubGroup.included_modules #=> class ancestors 

或者，用一個輔助方法：

class Class 
    def ancestor_classes 
    ancestors - included_modules 
    end 
end 

SubGroup.included_modules #=> module ancestors 
SubGroup.ancestor_classes #=> class ancestors 

Answer 2

使用Object#instance_of?：

Object.instance_of? Class # => true 
Object.instance_of? Module # => false 
Kernel.instance_of? Class # => false 
Kernel.instance_of? Module # => true