Class: Graphoid::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/graphoid/operators/relation.rb

Direct Known Subclasses

BelongsTo, EmbedsMany, EmbedsOne, HasMany, HasOne, ManyToMany

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relation) ⇒ Relation 



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# File 'lib/graphoid/operators/relation.rb', line 7

def initialize(relation)
  @name = relation.name.to_s
  @camel_name = Utils.camelize(@name)
  @inverse_name = Graphoid.driver.inverse_name_of(relation)
  @klass = relation.class_name.constantize
  @type = Graphoid.driver.relation_type(relation)
end

Instance Attribute Details

#inverse_name ⇒ Object (readonly)

Returns the value of attribute inverse_name.



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# File 'lib/graphoid/operators/relation.rb', line 5

def inverse_name
  @inverse_name
end

#klass ⇒ Object (readonly)

Returns the value of attribute klass.



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# File 'lib/graphoid/operators/relation.rb', line 5

def klass
  @klass
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/graphoid/operators/relation.rb', line 5

def name
  @name
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/graphoid/operators/relation.rb', line 5

def type
  @type
end

Class Method Details

.relations_of(model) ⇒ Object 



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# File 'lib/graphoid/operators/relation.rb', line 62

def relations_of(model)
  # return a list of relation objects
  # Graphoid.driver.relations_of(model).map { |_, relation| Relation.new(relation) }
  Graphoid.driver.relations_of(model)
end

Instance Method Details

#belongs? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 35

def belongs?
  belongs_to? || embedded_in?
end

#create(_, _, _) ⇒ Object 



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# File 'lib/graphoid/operators/relation.rb', line 49

def create(_, _, _); end

#embedded? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 43

def embedded?
  embeds_one? || embeds_many? || embedded_in?
end

#many? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 30

def many?
  # TODO: "through" can be one or many, we only support many at the moment.
  has_many? || has_and_belongs_to_many? || through? || embeds_many?
end

#many_to_many? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 39

def many_to_many?
  has_and_belongs_to_many? || through?
end

#one? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 26

def one?
  belongs_to? || has_one? || embeds_one?
end

#precreate(_) ⇒ Object 



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# File 'lib/graphoid/operators/relation.rb', line 47

def precreate(_); end

#relation? ⇒ Boolean 



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# File 'lib/graphoid/operators/relation.rb', line 22

def relation?
  true
end

#resolve(operation) ⇒ Object 



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# File 'lib/graphoid/operators/relation.rb', line 51

def resolve(operation)
  if one? || operation.operand.embedded?
    return operation.operand.exec(operation.scope, operation.value)
  end

  if many?
    return Graphoid.driver.relate_many(operation.scope, operation.operand, operation.value, operation.operator)
  end
end