StructureMapper
Structure mapper is a generic mapper of nested data structures (Hash, Array, ...) to ruby objects using very simple but powerful syntax. Unlike other mappers that are tightly coupled with persistence (ActiceRecord, Mongomapper), StructureMapper does only one thing, but does it well.
Installation
Add this line to your application's Gemfile:
gem 'structure_mapper'
And then execute:
$ bundle
Or install it yourself as:
$ gem install structure_mapper
Usage
require 'structure_mapper'
class MappedObject
include StructureMapper::Hash
attribute test: String
end
mapped=MappedObject.from_structure({'test' => 'some value'})
mapped.test # 'some value'
mapped.to_structure # {'test' => 'some value'}
Example for Parsing JSON and Mapping to Objects
require 'json'
require 'structure_mapper'
require 'pp'
data = '''
{
"name": "rails",
"downloads": 32904409,
"version": "4.0.3",
"version_downloads": 154351,
"platform": "ruby",
"authors": "David Heinemeier Hansson",
"info": "Ruby on Rails is a full-stack web framework optimized for programmer happiness and sustainable productivity. It encourages beautiful code by favoring convention over configuration.",
"licenses": [
"MIT"
],
"project_uri": "http://rubygems.org/gems/rails",
"gem_uri": "http://rubygems.org/gems/rails-4.0.3.gem",
"homepage_uri": "http://www.rubyonrails.org",
"wiki_uri": "http://wiki.rubyonrails.org",
"documentation_uri": "http://api.rubyonrails.org",
"mailing_list_uri": "http://groups.google.com/group/rubyonrails-talk",
"source_code_uri": "http://github.com/rails/rails",
"bug_tracker_uri": "http://github.com/rails/rails/issues",
"dependencies": {
"development": [],
"runtime": [
{
"name": "actionmailer",
"requirements": "= 4.0.3"
},
{
"name": "actionpack",
"requirements": "= 4.0.3"
},
{
"name": "activerecord",
"requirements": "= 4.0.3"
},
{
"name": "activesupport",
"requirements": "= 4.0.3"
},
{
"name": "bundler",
"requirements": "< 2.0, >= 1.3.0"
},
{
"name": "railties",
"requirements": "= 4.0.3"
},
{
"name": "sprockets-rails",
"requirements": "~> 2.0.0"
}
]
}
}
'''
class Dependency
include StructureMapper::Hash
attribute name: String
attribute requirements: String
end
class RubyGemInfo
include StructureMapper::Hash
attribute name: String
attribute downloads: Fixnum
attribute version: String
attribute version_downloads: Fixnum
attribute platform: String
attribute authors: String
attribute info: String
attribute licenses: []
attribute project_uri: String
attribute gem_uri: String
attribute homepage_uri: String
attribute wiki_uri: String
attribute documentation_uri: String
attribute mailing_list_uri: String
attribute source_code_uri: String
attribute bug_tracker_uri: String
attribute dependencies: {String => [Dependency]}
end
info=RubyGemInfo.from_structure(JSON.parse data)
Contributing
- Fork it ( http://github.com/
/structure_mapper/fork ) - 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 new Pull Request