Class: Mapping::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/mapping/model.rb

Direct Known Subclasses

ObjectModel

Constant Summary collapse

PREFIX = 
"map_".freeze

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.map(*klasses, &block) ⇒ Object

Add a mapping from a given input class to a specific block.



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# File 'lib/mapping/model.rb', line 21

def self.map(*klasses, &block)
  klasses.each do |klass|
    method_name = self.method_for_mapping(klass)
    define_method(method_name, &block)
  end
end

.map_identity(*klasses) ⇒ Object

Sometimes you just want to map things to themselves (the identity function). This makes it convenient to specify a lot of identity mappings.



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# File 'lib/mapping/model.rb', line 29

def self.map_identity(*klasses)
  self.map(*klasses) {|value| value}
end

.method_for_mapping(klass) ⇒ Object

This function generates mapping names like map_Array and map_Hash which while a bit non-standard are perfectly fine for our purposes and this never really needs to leak.



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# File 'lib/mapping/model.rb', line 11

def self.method_for_mapping(klass)
  PREFIX + klass.name.gsub(/::/, "_")
end

.unmap(*klasses) ⇒ Object

Remove a mapping, usually an inherited one, which you don't want.



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# File 'lib/mapping/model.rb', line 34

def self.unmap(*klasses)
  klasses.each do |klass|
    method_name = self.method_for_mapping(klass)
    undef_method(method_name)
  end
end

Instance Method Details

#map(root, *arguments, **options) ⇒ Object

The primary function, which maps an input object to an output object.



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# File 'lib/mapping/model.rb', line 42

def map(root, *arguments, **options)
  method_name = self.method_for_mapping(root)
  
  self.send(method_name, root, *arguments, **options)
end

#method_for_mapping(object) ⇒ Object

Get the name of the method for mapping the given object.



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# File 'lib/mapping/model.rb', line 16

def method_for_mapping(object)
  self.class.method_for_mapping(object.class)
end