Class: Stone::DataStore

Inherits:
Object
  • Object
show all
Defined in:
lib/stone/data_store.rb

Overview

An in-memory representation of the file-based datastore

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DataStore

self



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# File 'lib/stone/data_store.rb', line 71

def initialize
  @resources = {}
end

Class Method Details

.delete(id, klass_dir) ⇒ Object

Removes object’s yaml file

Parameters

id

id of the object to be removed

klass_dir

directory in which object resides



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# File 'lib/stone/data_store.rb', line 62

def delete(id, klass_dir)
  raise "Object could not be found" \
    unless File.exists?(self.local_dir/klass_dir/"#{id}.yml")
      
  FileUtils.remove_file(self.local_dir/klass_dir/"#{id}.yml")
  true
end

.determine_save_method(obj, store) ⇒ Object

If the object already exists (id was found), this returns put(update), else post(create)

Parameters

obj

The instantiated resource to be saved

store

DataStore object



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# File 'lib/stone/data_store.rb', line 41

def determine_save_method(obj, store)
  store.resources[obj.class.to_s.make_key].each do |o|
    return :put if o[0] == obj.id
  end
  :post
end

.load_data(sym) ⇒ Object

Loads yaml files specific to the resource represented by sym

Parameters

sym

Symbol representing resource data to load



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# File 'lib/stone/data_store.rb', line 21

def load_data(sym)
  dir = self.local_dir
  ymls = Dir.glob(dir/sym.to_s.pluralize/"*.yml")
  objs = []
  unless ymls.empty?
    ymls.each do |yml|
      obj = YAML.load_file yml
      objs << [obj.id, obj]
    end
  end
  return objs
end

.local_dir ⇒ Object

Provides the directory path to the local (app-specific) datastore



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# File 'lib/stone/data_store.rb', line 13

def local_dir
  @dir || Dir.pwd/"datastore"
end

.local_dir=(value) ⇒ Object

:nodoc:



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# File 'lib/stone/data_store.rb', line 8

def local_dir=(value) #:nodoc:
  @dir = value
end

.write_yaml(obj) ⇒ Object

Persist the object via YAML

Parameters

obj

The object to be persisted



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# File 'lib/stone/data_store.rb', line 51

def write_yaml(obj)
  path = self.local_dir/obj.class.to_s.downcase.pluralize/"#{obj.id}.yml"
  File.open(path, 'w') do |out|
    YAML.dump(obj, out)
  end
end

Instance Method Details

#resources ⇒ Object 



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# File 'lib/stone/data_store.rb', line 75

def resources
  @resources
end