Class: DataMapper::Associations::HasNAssociation

Inherits:
Object
  • Object
show all
Defined in:
lib/data_mapper/associations/has_n_association.rb

Direct Known Subclasses

BelongsToAssociation, HasManyAssociation

Constant Summary collapse

OPTIONS = 
[
  :class,
  :class_name,
  :foreign_key
]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, association_name, options) ⇒ HasNAssociation

Returns a new instance of HasNAssociation.



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# File 'lib/data_mapper/associations/has_n_association.rb', line 17

def initialize(klass, association_name, options)
  @constant = klass
  @adapter = database.adapter
  @table = @adapter.table(klass)
  @association_name = association_name.to_sym
  @options = options || Hash.new
  
  define_accessor(klass)
  
  Persistence::dependencies.add(associated_constant_name) do |klass|
    @foreign_key_column = associated_table[foreign_key_name]
    
    unless @foreign_key_column
      associated_constant.property(foreign_key_name, foreign_key_type)
    
      @foreign_key_column = associated_table[foreign_key_name]
    
      if @foreign_key_column.nil?
        raise ForeignKeyNotFoundError.new(<<-EOS.compress_lines)
          key_table => #{key_table.inspect},
          association_table => #{associated_table.inspect},
          association_name => #{name},
          foreign_key_name => #{foreign_key_name.inspect},
          foreign_key_type => #{foreign_key_type.inspect},
          constant => #{constant.inspect},
          associated_constant => #{associated_constant.inspect}
        EOS
      end
    end
  end
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/data_mapper/associations/has_n_association.rb', line 9

def options
  @options
end

Instance Method Details

#activate! ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 117

def activate!
  foreign_key_column
end

#associated_columns ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 105

def associated_columns
  associated_table.columns.reject { |column| column.lazy? }
end

#associated_constant ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 57

def associated_constant
  @associated_constant || @associated_constant = Kernel.const_get(associated_constant_name)
end

#associated_constant_name ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 61

def associated_constant_name
  @associated_constant_name || begin
    
    if @options.has_key?(:class) || @options.has_key?(:class_name)
      @associated_constant_name = (@options[:class] || @options[:class_name])
      
      if @associated_constant_name.kind_of?(String)
        @associated_constant_name = Inflector.classify(@associated_constant_name)
      elsif @associated_constant_name.kind_of?(Class)
        @associated_constant_name = @associated_constant_name.name
      end  
    else
      @associated_constant_name = Inflector.classify(@association_name)
    end
    
    @associated_constant_name
  end
  
end

#associated_table ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 101

def associated_table
  @association_table || @association_table = @adapter.table(associated_constant)
end

#constant ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 53

def constant
  @constant
end

#finder_options ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 109

def finder_options
  @finder_options || @finder_options = @options.reject { |k,v| self.class::OPTIONS.include?(k) }
end

#foreign_key_column ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 85

def foreign_key_column
  @foreign_key_column
end

#foreign_key_name ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 89

def foreign_key_name
  @foreign_key_name || @foreign_key_name = (@options[:foreign_key] || key_table.default_foreign_key)
end

#foreign_key_type ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 93

def foreign_key_type
  @foreign_key_type || @foreign_key_type = key_table.key.type
end

#key_table ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 97

def key_table
  @key_table || @key_table = @adapter.table(constant)
end

#name ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 49

def name
  @association_name
end

#primary_key_column ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 81

def primary_key_column
  @primary_key_column || @primary_key_column = key_table.key
end

#to_sql ⇒ Object 



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# File 'lib/data_mapper/associations/has_n_association.rb', line 113

def to_sql
  "JOIN #{associated_table.to_sql} ON #{foreign_key_column.to_sql(true)} = #{primary_key_column.to_sql(true)}"
end