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 118
118:         def inherited(subclass)
119:           cc = cti_columns
120:           ck = cti_key
121:           ct = cti_tables.dup
122:           ctm = cti_table_map.dup
123:           cbm = cti_base_model
124:           pk = primary_key
125:           ds = dataset
126:           subclass.instance_eval do
127:             raise(Error, "cannot create anonymous subclass for model class using class_table_inheritance") if !(n = name) || n.empty?
128:             table = ctm[n.to_sym] || implicit_table_name
129:             columns = db.from(table).columns
130:             @cti_key = ck 
131:             @cti_tables = ct + [table]
132:             @cti_columns = cc.merge(table=>columns)
133:             @cti_table_map = ctm
134:             @cti_base_model = cbm
135:             # Need to set dataset and columns before calling super so that
136:             # the main column accessor module is included in the class before any
137:             # plugin accessor modules (such as the lazy attributes accessor module).
138:             set_dataset(ds.join(table, [pk]))
139:             set_columns(self.columns)
140:           end
141:           super
142:           subclass.instance_eval do
143:             m = method(:constantize)
144:             dataset.row_proc = lambda{|r| (m.call(r[ck]) rescue subclass).load(r)}
145:             (columns - [cbm.primary_key]).each{|a| define_lazy_attribute_getter(a)}
146:             cti_tables.reverse.each do |table|
147:               db.schema(table).each{|k,v| db_schema[k] = v}
148:             end
149:           end
150:         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 154
154:         def primary_key
155:           return super if self == cti_base_model
156:           cti_base_model.primary_key
157:         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 161
161:         def table_name
162:           self == cti_base_model ? super : cti_tables.last
163:         end

[Validate]