what is difference between extended and extend

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.

asked Nov 14 '18 at 12:25

Sanjay 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.

asked Nov 14 '18 at 12:25

Sanjay 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.

asked Nov 14 '18 at 12:25

Sanjay Salunkhe

154

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 Salunkhe

154

asked Nov 14 '18 at 12:25

Sanjay Salunkhe

154

asked Nov 14 '18 at 12:25

Sanjay Salunkhe

154

asked Nov 14 '18 at 12:25

Sanjay Salunkhe

154

asked Nov 14 '18 at 12:25

Sanjay Salunkhe

154

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!

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo 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 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

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

mrzasa

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

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!

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo 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 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

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!

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo 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 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

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!

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo 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!

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo Lehto

4,10911328

edited Nov 14 '18 at 13:39

answered Nov 14 '18 at 12:34

Kimmo Lehto

4,10911328

answered Nov 14 '18 at 12:34

Kimmo Lehto

4,10911328

answered Nov 14 '18 at 12:34

Kimmo 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 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

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 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

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 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

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

mrzasa

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

mrzasa

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

mrzasa

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

mrzasa

10.4k104078

answered Nov 14 '18 at 12:34

mrzasa

10.4k104078

answered Nov 14 '18 at 12:34

mrzasa

10.4k104078

answered Nov 14 '18 at 12:34

mrzasa

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

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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