SknUtils
Rails Gem containing a Ruby PORO (Plain Old Ruby Object) that can be instantiated at runtime with an input hash. This library creates an Object with instance variables and associated getters and setters for Dot or Hash notational access to each instance variable. Additional instance variables can be added post-create by 'obj.my_new_var = "some value"', or simply assigning it.
The intent of this gem is to be a container of data results, with easy access to its contents with on-demand transformation to hash, xml, or json.
- If the key's value is also a hash, it too can optionally become an Object.
- if the key's value is a Array of Hashes, each element of the Array can optionally become an Object.
This nesting action is controlled by the value of the options key ':depth'. The key :depth defaults to :multi, an has options of :single, :multi, or :multi_with_arrays
The ability of the resulting Object to be Marshalled(dump/load) can be preserved by merging configuration options into the input params key ':enable_serialization' set to true. It defaults to false for speed purposes
Configuration Options
:enable_serialization = false -- [ true | false ], for speed, omits creation of attr_accessor
:depth = :multi -- [ :single | :multi | :multi_with_arrays ]
Public Components
Inherit from NestedResultBase or instantiate an pre-built Class:
SknUtils::GenericBean # => Serializable, includes attr_accessors, and follows hash values only.
SknUtils::PageControls # => Serializable, includes attr_accessors, and follows hash values and arrays of hashes.
SknUtils::ResultBean # => Not Serializable, includes attr_accessors, and follows hash values only.
SknUtils::ResultsBeanWithErrors # => Same as ResultBean with addition of ActiveModel::Errors object.
or Include AttributeHelpers # => Add getter/setters, and hash notation access to instance vars of any object.
Basic features include:
- provides the hash or dot notation methods of accessing values from object created; i.e
'obj = ResultBean.new({value1: "some value", value2: {one: 1, two: "two"}})
'x = obj.value1' or 'x = obj.value2.one'
'x = obj["value1"]'
'x = obj[:value1]'
- enables serialization by avoiding the use of ''singleton_class'' methods which breaks Serializers:
Serializer supports xml, json, hash, and standard Marshall''ing
person = PageControls.new({name: "Bob"})
person.attributes # => {"name"=>"Bob"}
person.serializable_hash # => {"name"=>"Bob"}
person.to_hash # => {"name"=>"Bob"}
person.to_json # => "{\"name\":\"Bob\"}"
person.to_xml # => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<page-controls>\n <name>Bob</name>\n</page-controls>\n"
dmp = Marshal.dump(person) # => "\x04\bo:\x1ASknUtils::PageControls\x06:\n@nameI\"\bBob\x06:\x06ET"
person = Marshal.load(dmp) # => #<SknUtils::PageControls:0x007faede906d40 @name="Bob">
***GenericBean designed to automatically handle the setup for serialization and multi level without arrays
- post create additions:
'obj = ResultBean.new({value1: "some value", value2: {one: 1, two: "two"}})
'x = obj.one' --causes NoMethodError
'x = obj.one = 'some other value' --creates a new instance value with accessors
'x = obj.one = {key1: 1, two: "two"}' --creates a new ***bean as the value of obj.one
'y = obj.one.two' --returns "two"
'y = obj.one[:two] --returns "two"
'y = obj.one['two'] --returns "two"
- supports predicates <attr>? and clear_<attr>? method patterns:
'obj = PageControls.new({name: "Something", phone: "2609998888"})'
'obj.name?' # => true true or false, like obj.name.present?
'obj.clear_name' # => nil sets :name to nil
The combination of this NestedResultBase(dot notation class) and AttributeHelpers(hash notation module), produces this effect given the same params hash:
SknUtils::ResultBean.new(params) Basic dot notation: effect of :depth
---------------------------------------------------- -----------------------------------------------------------------
(DOES NOT FOLLOW Values) :depth => :single
* params = {one: 1, drb.one = 1
two: { one: 1, drb.two = {one: 1, two: 'two}
two: "two" drb.two.two = NoMethodError
},
three: [ {one: 'one', two: 2}, drb.three = [{one: 'one', two: 2},{three: 'three', four: 4}]
{three: 'three', four: 4} drb.three[1] = {three: 'three', four: 4}
] drb.three[1].four = NoMethodError
}
(Follow VALUES that are Hashes only.) :depth => :multi
* params = {one: 1, drb.one = 1
two: { one: 1, drb.two = <SknUtils::ResultBean>
two: "two" drb.two.two = 'two'
},
three: [ {one: 'one', two: 2}, drb.three = [{one: 'one', two: 2},{three: 'three', four: 4}]
{three: 'three', four: 4} drb.three[1] = {three: 'three', four: 4}
] drb.three[1].four = NoMethodError
}
(Follow VALUES that are Hashes and/or Arrays of Hashes) :depth => :multi_with_arrays
* params = {one: 1, drb.one = 1
two: { one: 1, drb.two = <SknUtils::ResultBean>
two: "two" drb.two.two = 'two'
},
three: [ {one: 'one', two: 2}, drb.three = [<SknUtils::ResultBean>,<SknUtils::ResultBean>]
{three: 'three', four: 4} drb.three[1] = <SknUtils::ResultBean>
] drb.three[1].four = 4
}
Usage:
(DOES NOT FOLLOW Values)
class SmallPackage < SknUtils::NestedResultBase
def initialize(params={})
super( params.merge({depth: :single}) ) # override default of :multi level
end
end
(Follow VALUES that are Hashes only.)
class ResultBean < SknUtils::NestedResultBase
# defaults to :multi level
end
-- or --
class ResultBean < SknUtils::NestedResultBase
def initialize(params={})
# your other init stuff here
super(params) # default taken
end
end
-- or --
class ResultBean < SknUtils::NestedResultBase
def initialize(params={})
# your other init stuff here
super( params.merge({depth: :multi}) ) # Specified
end
end
** - or -- enable serialization and default to multi
class GenericBean < SknUtils::NestedResultBase
def initialize(params={})
super( params.merge({enable_serialization: true}) ) # Specified with Serialization Enabled
end
end
(Follow VALUES that are Hashes and/or Arrays of Hashes, and enable Serializers)
class PageControl < SknUtils::NestedResultBase
def initialize(params={})
super( params.merge({depth: :multi_with_arrays, enable_serialization: true}) ) # override defaults
end
end
NOTE: Cannot be Marshalled/Serialized unless input params.merge(true) -- default is false Use GenericBean or PageControls if serialization is needed, they initialize with this value true.
Installation
runtime prereqs: gem 'active_model', '~> 3.0'
Add this line to your application's Gemfile:
gem 'skn_utils'
And then execute:
$ bundle
Or install it yourself as:
$ gem install skn_utils
Build
- $ git clone [email protected]:skoona/skn_utils.git
- $ cd skn_utils
- $ gem install bundler
- $ bundle install
- $ bundle exec rspec
- $ gem build skn_utils.gemspec
- $ gem install skn_utils
- Done
Console Workout
Start with building gem first.
$ cd skn_utils
$ bundle exec pry
[1] pry(main)> require 'active_model'
[2] pry(main)> require 'skn_utils'
[3] pry(main)> rb = SknUtils::ResultBean.new({sample: [{one: "one", two: "two"},{one: 1, two: 2}] })
[4] pry(main)> pg = SknUtils::PageControls.new({sample: [{one: "one", two: "two"},{one: 1, two: 2}] })
[5] pry(main)> pg.sample.first.one # Tip :multi_with_arrays
[6] pry(main)> rb.sample.first.one # Tip :multi without arrays you will get a NoMethodError
[7] pry(main)> rb.sample.first[:one]
[n] pry(main)> exit
* Done
Contributing
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create a new Pull Request
License
MIT. See LICENSE.