I want to create a function to set the instance variable like attr_reader
class Base
def exec
# get all functions to check
# if all functions return true
# I will do something here
end
end
And then I have a class inherit Base.
class SomeClass < Base
check :check_1
check :check_2
def check_1
# checking
end
def check_2
# checking
end
end
class Some2Class < Base
check :check_3
check :check_4
def check_3
# checking
end
def check_4
# checking
end
end
Because I only need 1 logic for executing in all classes but I have a lot the different checks for each class, I need to do it flexibly.
Please, give me a keyword for it.
Many thanks.
In order to have check :check_1 you need to define check as a class method:
class Base
def self.check(name)
# ...
end
end
Since you want to call the passed method names later on, I'd store them in an array: (provided by another class method checks)
class Base
def self.checks
@checks ||= []
end
def self.check(name)
checks << name
end
end
This already gives you:
SomeClass.checks
#=> [:check_1, :check_2]
Some2Class.checks
#=> [:check_3, :check_4]
Now you can traverse this array from within exec and invoke each method via send. You can use all? to check whether all of them return a truthy result:
class Base
# ...
def exec
if self.class.checks.all? { |name| send(name) }
# do something
end
end
end
SomeClass.new.exec # doesn't do anything yet
The self.class part is needed because you are calling the class method checks from the instance method exec.