### Home Classes Methods

### In Files

- lib/sequel/plugins/class_table_inheritance.rb

### Methods

- #inherited
- #primary_key
- #table_name

### Files

- CHANGELOG
- COPYING
- README.rdoc
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- reflection.rdoc
- 1.0.txt
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- 3.11.0.txt
- 3.12.0.txt
- 3.2.0.txt
- 3.3.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- sharding.rdoc
- sql.rdoc
- virtual_rows.rdoc

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No matching classes.

# Sequel::Plugins::ClassTableInheritance::ClassMethods

### Attributes

cti_base_model[R]

The parent/root/base model for this class table inheritance hierarchy. This is the only model in the hierarchy that load the class_table_inheritance plugin.

cti_columns[R]

Hash with table name symbol keys and arrays of column symbol values, giving the columns to update in each backing database table.

cti_key[R]

The column containing the class name as a string. Used to return instances of subclasses when calling the superclass’s load method.

cti_table_map[R]

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.

cti_tables[R]

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.

### Public Instance Methods

inherited(subclass) click to toggle source

Add the appropriate data structures to the subclass. Does not allow anonymous subclasses to be created, since they would not be mappable to a table.

    # File lib/sequel/plugins/class_table_inheritance.rb, line 124
    def inherited(subclass)
      cc = cti_columns
      ck = cti_key
      ct = cti_tables.dup
      ctm = cti_table_map.dup
      cbm = cti_base_model
      pk = primary_key
      ds = dataset
      subclass.instance_eval do
        raise(Error, "cannot create anonymous subclass for model class using class_table_inheritance") if !(n = name) || n.empty?
        table = ctm[n.to_sym] || implicit_table_name
        columns = db.from(table).columns
        @cti_key = ck
        @cti_tables = ct + [table]
        @cti_columns = cc.merge(table=>columns)
        @cti_table_map = ctm
        @cti_base_model = cbm
        # Need to set dataset and columns before calling super so that
        # the main column accessor module is included in the class before any
        # plugin accessor modules (such as the lazy attributes accessor module).
        set_dataset(ds.join(table, [pk]))
        set_columns(self.columns)
      end
      super
      subclass.instance_eval do
        m = method(:constantize)
        dataset.row_proc = lambda{|r| (m.call(r[ck]) rescue subclass).load(r)}
        (columns - [cbm.primary_key]).each{|a| define_lazy_attribute_getter(a)}
        cti_tables.reverse.each do |table|
          db.schema(table).each{|k,v| db_schema[k] = v}
        end
      end
    end

primary_key() click to toggle source

The primary key in the parent/base/root model, which should have a foreign key with the same name referencing it in each model subclass.

    # File lib/sequel/plugins/class_table_inheritance.rb, line 160
    def primary_key
      return super if self == cti_base_model
      cti_base_model.primary_key
    end

table_name() click to toggle source

The table name for the current model class’s main table (not used by any superclasses).

    # File lib/sequel/plugins/class_table_inheritance.rb, line 167
    def table_name
      self == cti_base_model ? super : cti_tables.last
    end

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