Module Sequel::Plugins::ClassTableInheritance::ClassMethods
In: lib/sequel/plugins/class_table_inheritance.rb

Methods

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

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.

[Source]

     # File lib/sequel/plugins/class_table_inheritance.rb, line 124
124:         def inherited(subclass)
125:           cc = cti_columns
126:           ck = cti_key
127:           ct = cti_tables.dup
128:           ctm = cti_table_map.dup
129:           cbm = cti_base_model
130:           pk = primary_key
131:           ds = dataset
132:           subclass.instance_eval do
133:             raise(Error, "cannot create anonymous subclass for model class using class_table_inheritance") if !(n = name) || n.empty?
134:             table = ctm[n.to_sym] || implicit_table_name
135:             columns = db.from(table).columns
136:             @cti_key = ck 
137:             @cti_tables = ct + [table]
138:             @cti_columns = cc.merge(table=>columns)
139:             @cti_table_map = ctm
140:             @cti_base_model = cbm
141:             # Need to set dataset and columns before calling super so that
142:             # the main column accessor module is included in the class before any
143:             # plugin accessor modules (such as the lazy attributes accessor module).
144:             set_dataset(ds.join(table, [pk]))
145:             set_columns(self.columns)
146:           end
147:           super
148:           subclass.instance_eval do
149:             m = method(:constantize)
150:             dataset.row_proc = lambda{|r| (m.call(r[ck]) rescue subclass).load(r)}
151:             (columns - [cbm.primary_key]).each{|a| define_lazy_attribute_getter(a)}
152:             cti_tables.reverse.each do |table|
153:               db.schema(table).each{|k,v| db_schema[k] = v}
154:             end
155:           end
156:         end

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.

[Source]

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

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

[Source]

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

[Validate]