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Serializing Data With YAML
CodeExpectedActual
require 'yaml'
10.to_yaml
 "--- 10\n" "--- 10\n" 
'ten'.to_yaml
 "--- ten\n" "--- ten\n" 
'10'.to_yaml
 "--- \"10\"\n" "--- \"10\"\n" 
puts %w{Brush up your Shakespeare}.to_yaml
 
---
- Brush
- up
- your
- Shakespeare
 
--- 
- Brush
- up
- your
- Shakespeare
 
puts ({ 'star' => 'hydrogen', 'gold bar' => 'gold' }).to_yaml
 
---
star: hydrogen
gold bar: gold
 
--- 
star: hydrogen
gold bar: gold
 
require 'set'
puts Set.new([1, 2, 3]).to_yaml
 
--- !ruby/object:Set
hash:
1: true
2: true
3: true
 
--- !ruby/object:Set 
hash: 
  1: true
  2: true
  3: true
 
users = [{:name => 'Bob', :permissions => ['Read']},
         {:name => 'Alice', :permissions => ['Read', 'Write']}]
 
Serialize
 






open('users', 'w') { |f| YAML.dump(users, f) }


And deserialize








users2 = open("users") { |f| YAML.load(f) }

[{:permissions=>["Read"], :name=>"Bob"},
[{:permissions=>["Read"], :name=>"Bob"}, {:permissions=>["Read", "Write"], :name=>"Alice"}]





quiz_question = ['What color is Raedon?', ['Blue', 'Albino', '*Yellow']]
puts quiz_question.to_yaml


---
- What color is Raedon?
- - Blue
- Albino
- "*Yellow"


--- 
- What color is Raedon?
- - Blue
  - Albino
  - "*Yellow"






require 'yaml'
require 'set'
set = Set.new([1, 2, 3])
open("set", "w") { |f| YAML.dump(set, f) } 


Bad code -- don't try this!








require 'yaml'
set = open("set") { |f| YAML.load(f) }

#<YAML::Object:0xb7bd8620 @ivars={"hash"=>{1=>true, 2=>true, 3=>true}},
#<Set: {1, 2, 3}>





handle = open('a_file', 'w')
handle.path

"a_file"
"a_file"





handle2 = YAML.load(YAML.dump(handle))

#<File:0xb7bd9a58>
#<File:0xb7bd992c>





handle2.path


IOError: uninitialized stream
...


IOError: uninitialized stream
	from (irb):24:in `path'
	from (irb):24