### Home Classes Methods

### In Files

- lib/sequel/plugins/composition.rb

### Methods

- #composition
- #define_composition_accessor
- #inherited

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.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
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class Index

Quicksearch

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- Sequel::Plugins::RcteTree
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- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
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- Sequel::Plugins::Subclasses::ClassMethods
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- String
- String::Inflections
- Array
- FalseClass
- Hash
- NilClass
- Numeric
- Object
- PGconn
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- Proc
- Symbol
- TrueClass

No matching classes.

# Sequel::Plugins::Composition::ClassMethods

### Attributes

compositions[R]

A hash with composition name keys and composition reflection hash values.

composition_module[R]

A module included in the class holding the composition getter and setter methods.

### Public Instance Methods

composition(name, opts={}) click to toggle source

Define a composition for this model, with name being the name of the composition. You must provide either a :mapping option or both the :composer and :decomposer options.

Options:

- :class - if using the :mapping option, the class to use, as a Class, String or Symbol.

- :composer - A proc that is instance evaled when the composition getter method is called to create the composition.

- :decomposer - A proc that is instance evaled before saving the model object, if the composition object exists, which sets the columns in the model object based on the value of the composition object.

- :mapping - An array where each element is either a symbol or an array of two symbols. A symbol is treated like an array of two symbols where both symbols are the same. The first symbol represents the getter method in the model, and the second symbol represents the getter method in the composition object. Example:

        # Uses columns year, month, and day in the current model
        # Uses year, month, and day methods in the composition object
        :mapping=>[:year, :month, :day]
        # Uses columns year, month, and day in the current model
        # Uses y, m, and d methods in the composition object where
        # for example y in the composition object represents year
        # in the model object.
        :mapping=>[[:year, :y], [:month, :m], [:day, :d]]

         # File lib/sequel/plugins/composition.rb, line 93
     93:         def composition(name, opts={})
     94:           opts = opts.dup
     95:           compositions[name] = opts
     96:           if mapping = opts[:mapping]
     97:             keys = mapping.map{|k| k.is_a?(Array) ? k.first : k}
     98:             if !opts[:composer]
     99:               late_binding_class_option(opts, name)
    100:               klass = opts[:class]
    101:               class_proc = proc{klass || constantize(opts[:class_name])}
    102:               opts[:composer] = proc do
    103:                 if values = keys.map{|k| send(k)} and values.any?{|v| !v.nil?}
    104:                   class_proc.call.new(*values)
    105:                 else
    106:                   nil
    107:                 end
    108:               end
    109:             end
    110:             if !opts[:decomposer]
    111:               setter_meths = keys.map{|k| :"#{k}="}
    112:               cov_methods = mapping.map{|k| k.is_a?(Array) ? k.last : k}
    113:               setters = setter_meths.zip(cov_methods)
    114:               opts[:decomposer] = proc do
    115:                 if (o = compositions[name]).nil?
    116:                   setter_meths.each{|sm| send(sm, nil)}
    117:                 else
    118:                   setters.each{|sm, cm| send(sm, o.send(cm))}
    119:                 end
    120:               end
    121:             end
    122:           end
    123:           raise(Error, "Must provide :composer and :decomposer options, or :mapping option") unless opts[:composer] && opts[:decomposer]
    124:           define_composition_accessor(name, opts)
    125:         end

define_composition_accessor(name, opts={}) click to toggle source

Define getter and setter methods for the composition object.

         # File lib/sequel/plugins/composition.rb, line 135
    135:         def define_composition_accessor(name, opts={})
    136:           include(@composition_module ||= Module.new) unless composition_module
    137:           composer = opts[:composer]
    138:           composition_module.class_eval do
    139:             define_method(name) do
    140:               compositions.include?(name) ? compositions[name] : (compositions[name] = instance_eval(&composer))
    141:             end
    142:             define_method("#{name}=") do |v|
    143:               modified!
    144:               compositions[name] = v
    145:             end
    146:           end
    147:         end

inherited(subclass) click to toggle source

Copy the necessary class instance variables to the subclass.

         # File lib/sequel/plugins/composition.rb, line 128
    128:         def inherited(subclass)
    129:           super
    130:           c = compositions.dup
    131:           subclass.instance_eval{@compositions = c}
    132:         end

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