Importing from YAML

ruby-talk
1

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.

···

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2

Toby Rodwell wrote:

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

3

Toby Rodwell wrote:

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.

···

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4

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

···

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5

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

Toby Rodwell wrote:

···

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

--
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6

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

···

On Sep 24, 2006, at 12:04 PM, Toby Rodwell wrote:

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

7

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

James Edward Gray II

···

On Sep 24, 2006, at 12:12 PM, Toby Rodwell wrote:

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