Class: Amalgam::ContentPersistence

Inherits:
Object
  • Object
show all
Defined in:
lib/amalgam/content_persistence.rb

Class Method Summary collapse

Class Method Details

.prepare_records(content) ⇒ Object 



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# File 'lib/amalgam/content_persistence.rb', line 24

def self.prepare_records(content)
  records = {}
  content.each do |content_key,content_value|
    klass,id,field = sanitize_content_key(content_key)
    record = records["#{klass}/#{id}"] ||= {
      :class => klass,
      :id => id,
      :attributes => {}
    }
    # convert form 'field.sub1.sub2 = value' to '{field:{sub1:{sub2:value}}'
    attribute = (field.split('.') << content_value['value']).reverse.reduce{|value,key| {key => value} }
    record[:attributes].deep_merge!(attribute)
  end
  records
end

.sanitize_content_key(key) ⇒ Object 



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# File 'lib/amalgam/content_persistence.rb', line 14

def self.sanitize_content_key(key)
  if r = %r{\A(?<type>[a-z_]+)/(?<id>[0-9a-z]+)\.(?<field>[0-9a-z_]+(\.[0-9a-z_]+)*)\z}.match(key.chomp.downcase)
    cls = r[:type].classify
    raise %{Illegal type "#{cls}"} unless Amalgam.type_whitelist.include?(cls)
    [cls,r[:id],r[:field]]
  else
    raise %{Illegal content key "#{key}"}
  end
end

.save(content) ⇒ Object 



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# File 'lib/amalgam/content_persistence.rb', line 4

def self.save(content)
  records = prepare_records(content)
  records.each do |key,record|
    instance = record[:class].constantize.find(record[:id])
    # merge only changed field of model
    attrs = instance.attributes.slice(*record[:attributes].keys).deep_merge(record[:attributes])
    instance.update_attributes(attrs)
  end
end