Module: Sequel::Plugins::HybridTableInheritance::ClassMethods

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#cti_instance_dataset ⇒ Object (readonly)

The dataset that table instance datasets are based on. Used for database modifications



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 246

def cti_instance_dataset
  @cti_instance_dataset
end

#cti_models ⇒ Object (readonly)

An array of each model in the inheritance hierarchy that uses an backed by a new table.



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 208

def cti_models
  @cti_models
end

#cti_subclass_datasets ⇒ Object (readonly)

A hash with subclass models keys and datasets to load that subclass assuming the current model has already been loaded. Used for eager loading



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 226

def cti_subclass_datasets
  @cti_subclass_datasets
end

#cti_subclass_load ⇒ Object (readonly)

Eager loading option



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 229

def cti_subclass_load
  @cti_subclass_load
end

#cti_table_columns ⇒ Object (readonly)

An array of column symbols for the backing database table, giving the columns to update in each backing database table.



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 242

def cti_table_columns
  @cti_table_columns
end

#cti_table_map ⇒ Object (readonly)

A hash with class name symbol keys and table name symbol values. Specified with the :table_map option to the plugin, and used if the implicit naming is incorrect.



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 256

def cti_table_map
  @cti_table_map
end

#cti_tables ⇒ Object (readonly)

An array of table symbols that back this model. The first is cti_base_model table symbol, and the last is the current model table symbol.



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 251

def cti_tables
  @cti_tables
end

Instance Method Details

#cti_base_model ⇒ Object

The parent/root/base model for this class table inheritance hierarchy. This is the only model in the hierarchy that loads the class_table_inheritance plugin. Only needed to be compatible with class_table_inheritance plugin



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 214

def cti_base_model
  @cti_models.first
end

#cti_columns ⇒ Object

Hash with table name symbol keys and arrays of column symbol values, giving the columns to update in each backing database table. Only needed to be compatible with class_table_inheritance plugin



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 234

def cti_columns
  h = {}
  cti_models.each { |m| h[m.table_name] = m.cti_table_columns }
  h
end

#cti_table_model ⇒ Object

Last model in the inheritance hierarchy to use a new table



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 219

def cti_table_model
  @cti_models.last
end

#inherited(subclass) ⇒ Object 



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 258

def inherited(subclass)
  ds = sti_dataset

  # Prevent inherited in model/base.rb from setting the dataset
  subclass.instance_eval { @dataset = nil }

  @cti_tables.push ds.first_source_alias # Kludge to change filter to use root table
  super # Call single_table_inheritance
  @cti_tables.pop

  cm = cti_models
  ctm = cti_table_map
  ct = cti_tables
  ctc = cti_table_columns
  cid = cti_instance_dataset
  pk = primary_key
  csl = cti_subclass_load

  # Set table if this is a class table inheritance
  table = nil
  columns = nil
  if (n = subclass.name) && !n.empty?
    if table = ctm[n.to_sym]
      columns = db.from(table).columns
    else
      table = subclass.implicit_table_name
      columns = db.from(table).columns rescue nil
      table = nil if !columns || columns.empty?
    end
  end
  table = nil if table && (table == table_name)

  subclass.instance_eval do
    @cti_table_map = ctm
    @cti_subclass_load = csl
    @cti_subclass_datasets = {}

    if table
      if ct.length == 1
        ds = ds.select(*self.columns.map{|cc| Sequel.qualify(table_name, Sequel.identifier(cc))})
      end
      sel_app = (columns - [pk]).map{|cc| Sequel.qualify(table, Sequel.identifier(cc))}
      @sti_dataset = ds.join(table, pk=>pk).select_append(*sel_app)
      set_dataset(@sti_dataset)
      set_columns(self.columns)
      dataset.row_proc = lambda{|r| subclass.sti_load(r)}

      @cti_models = cm + [self]
      @cti_tables = ct + [table]
      @cti_table_columns = columns
      @cti_instance_dataset = db.from(table_name)

      unless csl == :lazy_only
        cm.each do |model|
          sd = model.instance_variable_get(:@cti_subclass_datasets)
          unless d = sd[cm.last]
            sd[self] = db.from(table).select(*columns.map{|cc| Sequel.qualify(table_name, Sequel.identifier(cc))})
          else
            sd[self] = d.join(table, pk=>pk).select_append(*sel_app)
          end
        end
      end
      unless csl == :eager_only
        (columns - [pk]).each{|a| define_lazy_attribute_getter(a, :dataset=>dataset, :table=>table)}
      end
      cti_tables.reverse.each do |ct|
        db.schema(ct).each{|sk,v| db_schema[sk] = v}
      end
    else
      @cti_models = cm
      @cti_tables = ct
      @cti_table_columns = ctc
      @cti_instance_dataset = cid
    end
  end
end

#sti_class_from_key(key) ⇒ Object 



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 340

def sti_class_from_key(key)
  sti_class(sti_model_map[key])
end

#table_name ⇒ Object

The table name for the current model class’s main table.



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# File 'lib/sequel/plugins/hybrid_table_inheritance.rb', line 336

def table_name
  cti_tables ? cti_tables.last : super
end