Module: Sequel::Plugins::SingleTableInheritance::ClassMethods

Defined in:
lib/sequel/plugins/single_table_inheritance.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#sti_dataset ⇒ Object (readonly)

The base dataset for STI, to which filters are added to get only the models for the specific STI subclass.



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# File 'lib/sequel/plugins/single_table_inheritance.rb', line 32

def sti_dataset
  @sti_dataset
end

#sti_key ⇒ Object (readonly)

The column name holding the STI key for this model



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# File 'lib/sequel/plugins/single_table_inheritance.rb', line 35

def sti_key
  @sti_key
end

Instance Method Details

#inherited(subclass) ⇒ Object

Copy the sti_key and sti_dataset to the subclasses, and filter the subclass’s dataset so it is restricted to rows where the key column matches the subclass’s name.



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# File 'lib/sequel/plugins/single_table_inheritance.rb', line 40

def inherited(subclass)
  super
  sk = sti_key
  sd = sti_dataset
  subclass.set_dataset(sd.filter(SQL::QualifiedIdentifier.new(table_name, sk)=>subclass.name.to_s), :inherited=>true)
  subclass.instance_eval do
    @sti_key = sk
    @sti_dataset = sd
    @simple_table = nil
  end
end

#sti_load(r) ⇒ Object

Return an instance of the class specified by sti_key, used by the row_proc.



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# File 'lib/sequel/plugins/single_table_inheritance.rb', line 54

def sti_load(r)
  v = r[sti_key]
  model = if (v && v != '')
    constantize(v) rescue self
  else
    self
  end
  model.load(r)
end