what is difference between extended and extend_object hook
can someone explain the difference between extended and extend_object hook. There is no proper documentation on the internet for this.
ruby
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
add a comment |
can someone explain the difference between extended and extend_object hook. There is no proper documentation on the internet for this.
ruby
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
add a comment |
can someone explain the difference between extended and extend_object hook. There is no proper documentation on the internet for this.
ruby
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
can someone explain the difference between extended and extend_object hook. There is no proper documentation on the internet for this.
ruby
ruby
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
asked Nov 14 '18 at 12:25
Sanjay SalunkheSanjay Salunkhe
154
154
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
In essence, extend_object is the method that does the extending. You can override it to for example create a typecheck before extend happens:
module Foo
def self.extend_object(obj)
raise(TypeError, "No strings!") if obj.is_a?(String)
super # need to call super or object
# won't be extended
end
def self.extended(obj)
puts "#{obj.inspect} was extended with #{self}"
end
end
1.extend(Foo)
"1".extend(Foo) # raises TypeError: No strings!
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its notbefore_extended- it's the method doing extension. If you override it without callingsuperyou'll be unable to extend.
– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
add a comment |
extend_object is a private API method used by extend and it adds module constants and methods
extend_object(p1) private
Extends the specified object by adding this module’s constants and methods (which are added as singleton methods). This is the callback method used by
Object#extend.
https://apidock.com/ruby/Module/extend_object
extended is just a callback that can be used by a developer to run specific code when a module is being extended.
https://ruby-doc.org/core-2.2.0/Module.html#method-i-extended
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
In essence, extend_object is the method that does the extending. You can override it to for example create a typecheck before extend happens:
module Foo
def self.extend_object(obj)
raise(TypeError, "No strings!") if obj.is_a?(String)
super # need to call super or object
# won't be extended
end
def self.extended(obj)
puts "#{obj.inspect} was extended with #{self}"
end
end
1.extend(Foo)
"1".extend(Foo) # raises TypeError: No strings!
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its notbefore_extended- it's the method doing extension. If you override it without callingsuperyou'll be unable to extend.
– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
add a comment |
In essence, extend_object is the method that does the extending. You can override it to for example create a typecheck before extend happens:
module Foo
def self.extend_object(obj)
raise(TypeError, "No strings!") if obj.is_a?(String)
super # need to call super or object
# won't be extended
end
def self.extended(obj)
puts "#{obj.inspect} was extended with #{self}"
end
end
1.extend(Foo)
"1".extend(Foo) # raises TypeError: No strings!
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its notbefore_extended- it's the method doing extension. If you override it without callingsuperyou'll be unable to extend.
– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
add a comment |
In essence, extend_object is the method that does the extending. You can override it to for example create a typecheck before extend happens:
module Foo
def self.extend_object(obj)
raise(TypeError, "No strings!") if obj.is_a?(String)
super # need to call super or object
# won't be extended
end
def self.extended(obj)
puts "#{obj.inspect} was extended with #{self}"
end
end
1.extend(Foo)
"1".extend(Foo) # raises TypeError: No strings!
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
In essence, extend_object is the method that does the extending. You can override it to for example create a typecheck before extend happens:
module Foo
def self.extend_object(obj)
raise(TypeError, "No strings!") if obj.is_a?(String)
super # need to call super or object
# won't be extended
end
def self.extended(obj)
puts "#{obj.inspect} was extended with #{self}"
end
end
1.extend(Foo)
"1".extend(Foo) # raises TypeError: No strings!
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
edited Nov 14 '18 at 13:39
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
answered Nov 14 '18 at 12:34
Kimmo LehtoKimmo Lehto
4,10911328
4,10911328
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its notbefore_extended- it's the method doing extension. If you override it without callingsuperyou'll be unable to extend.
– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
add a comment |
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its notbefore_extended- it's the method doing extension. If you override it without callingsuperyou'll be unable to extend.
– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
why do we need super keyword /
– Sanjay Salunkhe
Nov 14 '18 at 12:38
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
Because otherwise the object won't be extended.
– Kimmo Lehto
Nov 14 '18 at 12:40
so its not
before_extended - it's the method doing extension. If you override it without calling super you'll be unable to extend.– mrzasa
Nov 14 '18 at 13:32
so its not
before_extended - it's the method doing extension. If you override it without calling super you'll be unable to extend.– mrzasa
Nov 14 '18 at 13:32
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
@mrzasa correct.
– Kimmo Lehto
Nov 14 '18 at 13:39
add a comment |
extend_object is a private API method used by extend and it adds module constants and methods
extend_object(p1) private
Extends the specified object by adding this module’s constants and methods (which are added as singleton methods). This is the callback method used by
Object#extend.
https://apidock.com/ruby/Module/extend_object
extended is just a callback that can be used by a developer to run specific code when a module is being extended.
https://ruby-doc.org/core-2.2.0/Module.html#method-i-extended
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
add a comment |
extend_object is a private API method used by extend and it adds module constants and methods
extend_object(p1) private
Extends the specified object by adding this module’s constants and methods (which are added as singleton methods). This is the callback method used by
Object#extend.
https://apidock.com/ruby/Module/extend_object
extended is just a callback that can be used by a developer to run specific code when a module is being extended.
https://ruby-doc.org/core-2.2.0/Module.html#method-i-extended
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
add a comment |
extend_object is a private API method used by extend and it adds module constants and methods
extend_object(p1) private
Extends the specified object by adding this module’s constants and methods (which are added as singleton methods). This is the callback method used by
Object#extend.
https://apidock.com/ruby/Module/extend_object
extended is just a callback that can be used by a developer to run specific code when a module is being extended.
https://ruby-doc.org/core-2.2.0/Module.html#method-i-extended
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
extend_object is a private API method used by extend and it adds module constants and methods
extend_object(p1) private
Extends the specified object by adding this module’s constants and methods (which are added as singleton methods). This is the callback method used by
Object#extend.
https://apidock.com/ruby/Module/extend_object
extended is just a callback that can be used by a developer to run specific code when a module is being extended.
https://ruby-doc.org/core-2.2.0/Module.html#method-i-extended
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
answered Nov 14 '18 at 12:34
mrzasamrzasa
10.4k104078
10.4k104078
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
add a comment |
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
extend_object and extended both are hooks and are called automatically whenever i extend module in my class , so what is the need of extend_object ?
– Sanjay Salunkhe
Nov 14 '18 at 12:36
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
As the docs says - it extends an object using the module - it does the job. You probably don't have to touch it.
– mrzasa
Nov 14 '18 at 12:38
add a comment |
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