Module: Sequel::Plugins::ClassTableInheritance::ClassMethods
- Defined in:
- lib/sequel/plugins/class_table_inheritance.rb
Instance Attribute Summary collapse
-
#cti_base_model ⇒ Object
readonly
The parent/root/base model for this class table inheritance hierarchy.
-
#cti_columns ⇒ Object
readonly
Hash with table name symbol keys and arrays of column symbol values, giving the columns to update in each backing database table.
-
#cti_key ⇒ Object
readonly
The column containing the class name as a string.
-
#cti_table_map ⇒ Object
readonly
A hash with class name symbol keys and table name symbol values.
-
#cti_tables ⇒ Object
readonly
An array of table symbols that back this model.
Instance Method Summary collapse
-
#inherited(subclass) ⇒ Object
Add the appropriate data structures to the subclass.
-
#primary_key ⇒ Object
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.
-
#table_name ⇒ Object
The table name for the current model class’s main table (not used by any superclasses).
Instance Attribute Details
#cti_base_model ⇒ Object (readonly)
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.
104 105 106 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 104 def cti_base_model @cti_base_model end |
#cti_columns ⇒ Object (readonly)
Hash with table name symbol keys and arrays of column symbol values, giving the columns to update in each backing database table.
108 109 110 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 108 def cti_columns @cti_columns end |
#cti_key ⇒ Object (readonly)
The column containing the class name as a string. Used to return instances of subclasses when calling the superclass’s load method.
113 114 115 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 113 def cti_key @cti_key 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.
123 124 125 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 123 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.
118 119 120 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 118 def cti_tables @cti_tables end |
Instance Method Details
#inherited(subclass) ⇒ Object
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.
128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 128 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 = if cti_key lambda{|r| (m.call(r[ck]) rescue subclass).load(r)} else lambda{|r| subclass.load(r)} end (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 ⇒ Object
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.
168 169 170 171 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 168 def primary_key return super if self == cti_base_model cti_base_model.primary_key end |
#table_name ⇒ Object
The table name for the current model class’s main table (not used by any superclasses).
175 176 177 |
# File 'lib/sequel/plugins/class_table_inheritance.rb', line 175 def table_name self == cti_base_model ? super : cti_tables.last end |