Importing from YAML

[Toby Rodwell]

I've learned that a very quick and easy way to save a Ruby object to a
file is to use YAML e.g.

def saveMyObject
File.open(self.fileName,"a+") { |f|
f.write(self.to_yaml)
f.close
}
end

However, the article which showed this did not then explain how this
process could be reversed. I assume there must be a an equivalent
simple use of file 'read', but a straight forward 'read' seems to give
just a string, and I can find no 'from_yaml' method whihc would read
YAML-formatted text straight into a Ruby object (and thus re-create that
object originally used to create the YAML file) . I'm sure there must
be a quick and easy way to do this - any suggestions?

Thanks in advance.

 

[MonkeeSage]

I've learned that a very quick and easy way to save a Ruby object to a
file is to use YAML e.g.

YAML#load (or its synonym #parse) loads object(s) from a YAML string.
Have a look at the docs: http://ruby-doc.org/core/classes/YAML.html

Regards,
Jordan

 

[Toby Rodwell]

Jordan Callicoat wrote:
...

YAML#load (or its synonym #parse) loads object(s) from a YAML string.
Have a look at the docs: http://ruby-doc.org/core/classes/YAML.html

Many thanks Jordan. For anyone interested I've just given it a go and
the reverse of the above code seems to be quite simply

def LoadMyObject
myObject = YAML.load_file(self.fileName)
end

 

[Toby Rodwell]

Oops, that should be 'loadMyObject' of course ...

 

[James Edward Gray II]

Jordan Callicoat wrote:
...

Many thanks Jordan. For anyone interested I've just given it a go and
the reverse of the above code seems to be quite simply

def LoadMyObject
myObject = YAML.load_file(self.fileName)
end

No need to assign to a local variable there, since it goes out of
scope as soon as you leave the method on the next line.

James Edward Gray II

 

[James Edward Gray II]

Oops, that should be 'loadMyObject' of course ...

Actually, the Ruby convention is to methods and variables like_this
and classes and modules LikeThis.

James Edward Gray II

 

[Eero Saynatkari]

I've learned that a very quick and easy way to save a Ruby object to a
file is to use YAML e.g.

def saveMyObject
File.open(self.fileName,"a+") { |f|
f.write(self.to_yaml)
f.close
}
end

No-one mentioned it but the f.close in the File.open block
is not required--the whole idea behind the block is to use
it to close the file automatically after it has executed.