YAML to Struct

ruby-talk
#1

Is it possible to take YAML and turn it into a Struct? I want to take
something that looks like this:

key_1: Value 1
key_2: Value 2

And turn it into an object with accessors...and I'm assuming a Struct
would be my best bet. I'm relatively new to the concepts of YAML and
the Struct class, so I'm banging my head against the wall trying to
figure this out.

Any ideas?

···

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Posted via http://www.ruby-forum.com/.

#2

Quoth Andrew Hite:

Is it possible to take YAML and turn it into a Struct? I want to take
something that looks like this:

key_1: Value 1
key_2: Value 2

And turn it into an object with accessors...and I'm assuming a Struct
would be my best bet. I'm relatively new to the concepts of YAML and
the Struct class, so I'm banging my head against the wall trying to
figure this out.

Any ideas?

Take a look at OpenStruct.

···

--
Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/

#3

Is it possible to take YAML and turn it into a Struct? I want to take
something that looks like this:

key_1: Value 1
key_2: Value 2

And turn it into an object with accessors...and I'm assuming a Struct
would be my best bet. I'm relatively new to the concepts of YAML and
the Struct class, so I'm banging my head against the wall trying to
figure this out.

Any ideas?
--
Posted via http://www.ruby-forum.com/.

cfp:~ > cat a.rb
require 'yaml'

class Hash
   def to_struct class_name = nil
     klass =
       unless class_name
         Struct.new *keys.map{|key| key.to_sym}
       else
         Struct.new class_name.to_s, *keys.map{|key| key.to_sym}
       end
     klass.new *values
   end
end

hash = YAML.load DATA.read

struct = hash.to_struct

p struct
p struct.x
p struct.key
p struct.a

__END__
x : y
key : value

cfp:~ > ruby a.rb
#<struct #<Class:0x40c43c> a=42, x="y", key="value">
"y"
"value"
42

a @ http://codeforpeople.com/

···

On Oct 9, 2007, at 5:46 PM, Andrew Hite wrote:
a : 42
--
it is not enough to be compassionate. you must act.
h.h. the 14th dalai lama

#4

Andrew Hite wrote:

Is it possible to take YAML and turn it into a Struct? I want to take
something that looks like this:

key_1: Value 1
key_2: Value 2

And turn it into an object with accessors...and I'm assuming a Struct
would be my best bet. I'm relatively new to the concepts of YAML and
the Struct class, so I'm banging my head against the wall trying to
figure this out.

Any ideas?

I was able to achieve this using OpenStruct and two lines of code:

data = YAML::load(yaml_data).to_hash
@item = OpenStruct.new(data)

···

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Posted via http://www.ruby-forum.com/.

#5

The easiest way is to create a MyStruct and add "--- !ruby/struct:MyStruct" to your YAML then use YAML.load. This way you can round-trip without pain.

$ ruby
require 'yaml'

MyStruct = Struct.new :key_1, :key_2

data = MyStruct.new 'Value 1', 'Value 2'

yaml = data.to_yaml

puts yaml

newdata = YAML.load yaml

p newdata
--- !ruby/struct:MyStruct
key_1: Value 1
key_2: Value 2
#<struct MyStruct key_1="Value 1", key_2="Value 2">

···

On Oct 9, 2007, at 16:46 , Andrew Hite wrote:

Is it possible to take YAML and turn it into a Struct? I want to take
something that looks like this:

key_1: Value 1
key_2: Value 2

And turn it into an object with accessors...and I'm assuming a Struct
would be my best bet. I'm relatively new to the concepts of YAML and
the Struct class, so I'm banging my head against the wall trying to
figure this out.

--
Poor workers blame their tools. Good workers build better tools. The
best workers get their tools to do the work for them. -- Syndicate Wars

#6

Take a look at OpenStruct.

Awesome, thanks! That looks like it should work.

···

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