Class: SyncTools

Inherits:
Object
  • Object
show all
Defined in:
lib/swim/sync_tools.rb

Overview

Tools for syncing a tree of ActiveRecord objects using a JSON file.

Class Method Summary collapse

Class Method Details

.compare(obj, hsh, settings) ⇒ Object 



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# File 'lib/swim/sync_tools.rb', line 56

def self.compare(obj, hsh, settings) 
  @changes = []
  if settings.present? && settings[:include]
    settings[:include].keys.each do |sk|
      compare_array(obj.send(sk), hsh[sk.to_s], settings[sk], sk)
    end      
  elsif settings.present? && settings.keys
    settings.keys.each do |sk|
      compare_array(obj.send(sk), hsh[sk.to_s], settings[sk.to_sym], sk)
    end
  end

  obj.attributes.each_pair do |key, value|
    hsh_value = hsh[key]
    if value.class == Time && hsh_value.class == String
      hsh_value = Time.parse(hsh_value).utc.to_s
      value = value.utc.to_s
    elsif hsh_value.class == Time && value.class == String
      hsh_value = hsh_value.utc.to_s
      value = Time.parse(value).utc.to_s
    elsif hsh_value.class == Time && value.class == Time
      hsh_value = hsh_value.utc.to_s
      value = value.utc.to_s
    end
    unless value == hsh_value
      # p "#{obj.class.to_s} #{obj.id} #{key} #{value} != #{hsh_value}"
      @changes << Swim::Change.new(:obj_class => obj.class.to_s, :obj_id => obj.id, :change_type => :update, :key => key, :old_value => value, :new_value => hsh_value)
    else
      # p "#{obj.class.to_s} #{key} #{value} == #{hsh_value}"
    end
  end
  return @changes
end

.compare_array(arr, hsh, settings, obj_classname) ⇒ Object 



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# File 'lib/swim/sync_tools.rb', line 90

def self.compare_array(arr, hsh, settings, obj_classname)
  if arr.length == 0 && hsh.nil?
    return
  elsif hsh.nil?
    raise ComparisonHashMissing, "Array (#{arr.collect{|ar| ar.class.to_s }}) has no hash for comparison"
  end
  hsh_members = hsh.collect{ |h| h["id"] }
  arr.each do |a|
    x = hsh.select{ |h| h if h["id"] == a.id }[0]
    hsh_members.delete(x["id"])
    if x.nil? || x.empty?
      @changes << Change.new(:obj_class => a.class.to_s.singularize.capitalize, :obj_id => a.id, :change_type => :delete)
    else
      compare(a, x, settings)
    end
  end
  if hsh_members.length > 0
    hsh_members.each do |hm|
      @changes << Change.new(:obj_class => obj_classname.to_s.singularize.capitalize, :obj_id => hm, :change_type => :insert, :new_value => hsh.select{ |h| h if h["id"] == hm }[0].to_json)
    end
  end
end

.compare_json_file(obj) ⇒ Object

compares a tree of ActiveRecord objects to a previously-saved JSON file



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# File 'lib/swim/sync_tools.rb', line 24

def self.compare_json_file(obj)    
  unless obj.methods.include?(:settings_path) || obj.methods.include?('settings_path')
    raise SettingsPathMissing, "#{obj.class.to_s} must define a class method named settings_file."
  end
  json = json_file(File.expand_path(obj.settings_path))
  
  unless obj.class.methods.include?(:sync_settings) || obj.class.methods.include?("sync_settings")
    raise SyncSettingsMissing, "#{obj.class.to_s} must define a class method named sync_settings that returns a hash."
  end
  
  if json[obj.class.to_s.underscore].class.to_s == "Hash"
    return compare(obj, json[obj.class.to_s.underscore], obj.class.sync_settings)
  else
    return compare(obj, json, obj.class.sync_settings)
  end
end

.import_json_file(obj, settings_path) ⇒ Object 



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# File 'lib/swim/sync_tools.rb', line 41

def self.import_json_file(obj, settings_path)
  changes = Swim::SyncTools.compare_json_file(self, settings_path)
  completed = []
  not_completed = []
  changes.each do |ch|
    oc = ch.process
    if oc
      completed << ch
    else
      not_completed << ch
    end
  end
  return { :status => (not_completed.length > 0 ? "incomplete" : "complete"), :changed => completed, :not_completed => not_completed }
end

.json_file(settings_path) ⇒ Object

loads and decodes a specified json_file



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# File 'lib/swim/sync_tools.rb', line 114

def self.json_file(settings_path)
  file = File.open(settings_path, "rb")
  contents = file.read
  ActiveSupport::JSON.decode(contents)
end

.save_settings(obj) ⇒ Object

Save a JSON representaton of the object to a file, specified by



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# File 'lib/swim/sync_tools.rb', line 18

def self.save_settings(obj)
  str = obj.to_json(:include => obj.class.sync_settings )    
  File.open(File.expand_path(obj.settings_path), 'w+') {|f| f.write(str) }
end