Module: Associatable

Included in:
ModelBase
Defined in:
lib/scaffold/lib/model/associations/associatable.rb

Instance Method Summary collapse

Instance Method Details

#assoc_options ⇒ Object 



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# File 'lib/scaffold/lib/model/associations/associatable.rb', line 35

def assoc_options
  @assoc_options ||= {}
  @assoc_options
end

#belongs_to(name, options = {}) ⇒ Object 



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# File 'lib/scaffold/lib/model/associations/associatable.rb', line 6

def belongs_to(name, options = {})
  options = BelongsToOptions.new(name, options)
  assoc_options[name] = options

  self.define_method(name) do
    validations = self.class.validators
      .map { |validator| [validator.attribute, validator.options[:presence]] }

    unless options.optional || validations.include?([options.foreign_key, true])
      self.class.validates options.foreign_key, presence: true 
    end
    
    options.model_class.find(self.send(options.foreign_key))
  end
end

#has_many(name, options = {}) ⇒ Object 



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# File 'lib/scaffold/lib/model/associations/associatable.rb', line 22

def has_many(name, options = {})
  if options[:through] && options[:source]
    has_many_through(name, options[:through], options[:source])
  else
    options = HasManyOptions.new(name, self.name, options)
    assoc_options[name] = options
  
    self.define_method(name) do 
      options.model_class.where(options.foreign_key => self.send(options.primary_key)).parsed_query
    end
  end
end

#has_many_through(name, through_name, source_name) ⇒ Object 



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# File 'lib/scaffold/lib/model/associations/associatable.rb', line 74

def has_many_through(name, through_name, source_name)
  define_method(name) do
    through_options = self.class.assoc_options[through_name]
    source_options = through_options.model_class.assoc_options[source_name]

    if through_options.is_a?(BelongsToOptions)
      through_self_id = through_options.primary_key
      self_through_id = through_options.foreign_key
    else
      through_self_id = through_options.foreign_key
      self_through_id = through_options.primary_key
    end

    if source_options.is_a?(BelongsToOptions)
      through_source_id = source_options.foreign_key
      source_through_id = source_options.primary_key
    else
      through_source_id = source_options.primary_key
      source_through_id = source_options.foreign_key
    end

    through_table = through_options.table_name
    source_table = source_options.table_name

    key_val = self.send(:id)
    results = DBConnection.execute("      SELECT\n        \#{source_table}.*\n      FROM\n        \#{through_table}\n      JOIN\n        \#{source_table}\n      ON\n        \#{through_table}.\#{through_source_id} = \#{source_table}.\#{source_through_id}\n      JOIN\n        \#{self.class.table_name}\n      ON\n        \#{self.class.table_name}.\#{self_through_id} = \#{through_table}.\#{through_self_id}\n      WHERE\n        \#{self.class.table_name}.id = ?\n    SQL\n\n    source_options.model_class.parse_all(results)\n  end\nend\n", key_val)

#has_one(name, options) ⇒ Object 



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# File 'lib/scaffold/lib/model/associations/associatable.rb', line 40

def has_one(name, options)
  through_name = options[:through]
  source_name = options[:source]

  define_method(name) do
    through_options = self.class.assoc_options[through_name]
    source_options = through_options.model_class.assoc_options[source_name]

    through_table = through_options.table_name
    through_pk = through_options.primary_key
    through_fk = through_options.foreign_key

    source_table = source_options.table_name
    source_pk = source_options.primary_key
    source_fk = source_options.foreign_key

    key_val = self.send(through_fk)
    results = DBConnection.execute("      SELECT\n        \#{source_table}.*\n      FROM\n        \#{through_table}\n      JOIN\n        \#{source_table}\n      ON\n        \#{through_table}.\#{source_fk} = \#{source_table}.\#{source_pk}\n      WHERE\n        \#{through_table}.\#{through_pk} = ?\n    SQL\n\n    source_options.model_class.parse_all(results).first\n  end\nend\n", key_val)