Class: LegacyData::TableClassNameMapper

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/legacy_data/table_class_name_mapper.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#dictionary ⇒ Object

Returns the value of attribute dictionary.



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 5

def dictionary
  @dictionary
end

#naming_convention ⇒ Object

Returns the value of attribute naming_convention.



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 5

def naming_convention
  @naming_convention
end

Class Method Details

.class_name_for(table_name) ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 42

def self.class_name_for table_name
  instance.lookup_class_name(table_name) || instance.compute_class_name(table_name)
end

.dictionary_file_name ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 23

def self.dictionary_file_name
  instance.dictionary_file_name
end

.load_dictionary ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 17

def self.load_dictionary
  instance.load_dictionary
end

.naming_convention=(value) ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 14

def self.naming_convention= value
  instance.naming_convention = value
end

.save_dictionary ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 20

def self.save_dictionary
  instance.save_dictionary
end

Instance Method Details

#compute_class_name(table_name) ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 50

def compute_class_name table_name
  table_name =~ /#{naming_convention}/i
  stripped_table_name = $1 || table_name
  dictionary[table_name] = ActiveRecord::Base.class_name(stripped_table_name.downcase.pluralize)
end

#dictionary_file_name ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 38

def dictionary_file_name
  File.join(RAILS_ROOT, 'app', 'models', 'table_mappings.yml')
end

#load_dictionary ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 27

def load_dictionary
  @dictionary = nil
  File.exists?(dictionary_file_name) ? YAML.load_file(dictionary_file_name) : {}
end

#lookup_class_name(table_name) ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 46

def lookup_class_name table_name
  dictionary[table_name]
end

#save_dictionary ⇒ Object 



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# File 'lib/legacy_data/table_class_name_mapper.rb', line 32

def save_dictionary
  File.open(dictionary_file_name, 'w') do |out|
    YAML.dump(dictionary, out)
  end
end