Class: JSONAPI::RelationshipBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/jsonapi/relationship_builder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(relationship_class, model_class, options) ⇒ RelationshipBuilder

Returns a new instance of RelationshipBuilder.



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# File 'lib/jsonapi/relationship_builder.rb', line 6

def initialize(relationship_class, model_class, options)
  @relationship_class = relationship_class
  @model_class        = model_class
  @resource_class     = options[:parent_resource]
  @options            = options
end

Instance Attribute Details

#model_class ⇒ Object (readonly)

Returns the value of attribute model_class.



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# File 'lib/jsonapi/relationship_builder.rb', line 3

def model_class
  @model_class
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/jsonapi/relationship_builder.rb', line 3

def options
  @options
end

#relationship_class ⇒ Object (readonly)

Returns the value of attribute relationship_class.



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# File 'lib/jsonapi/relationship_builder.rb', line 3

def relationship_class
  @relationship_class
end

Instance Method Details

#build_belongs_to(relationship, foreign_key, associated_records_method_name, relationship_name) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 85

def build_belongs_to(relationship, foreign_key, associated_records_method_name, relationship_name)
  # Calls method matching foreign key name on model instance
  define_on_resource foreign_key do
    @model.method(foreign_key).call
  end

  # Returns instantiated related resource object or nil
  define_on_resource relationship_name do |options = {}|
    relationship = self.class._relationships[relationship_name]

    if relationship.polymorphic?
      associated_model = public_send(associated_records_method_name)
      resource_klass = self.class.resource_for_model(associated_model) if associated_model
      return resource_klass.new(associated_model, @context) if resource_klass
    else
      resource_klass = relationship.resource_klass
      if resource_klass
        associated_model = public_send(associated_records_method_name)
        return associated_model ? resource_klass.new(associated_model, @context) : nil
      end
    end
  end
end

#build_has_one(relationship, foreign_key, associated_records_method_name, relationship_name) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 109

def build_has_one(relationship, foreign_key, associated_records_method_name, relationship_name)
  # Returns primary key name of related resource class
  define_on_resource foreign_key do
    relationship = self.class._relationships[relationship_name]

    record = public_send(associated_records_method_name)
    return nil if record.nil?
    record.public_send(relationship.resource_klass._primary_key)
  end

  # Returns instantiated related resource object or nil
  define_on_resource relationship_name do |options = {}|
    relationship = self.class._relationships[relationship_name]

    if relationship.polymorphic?
      associated_model = public_send(associated_records_method_name)
      resource_klass = self.class.resource_for_model(associated_model) if associated_model
      return resource_klass.new(associated_model, @context) if resource_klass && associated_model
    else
      resource_klass = relationship.resource_klass
      if resource_klass
        associated_model = public_send(associated_records_method_name)
        return associated_model ? resource_klass.new(associated_model, @context) : nil
      end
    end
  end
end

#build_to_many(relationship, foreign_key, associated_records_method_name, relationship_name) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 137

def build_to_many(relationship, foreign_key, associated_records_method_name, relationship_name)
  # Returns array of primary keys of related resource classes
  define_on_resource foreign_key do
    records = public_send(associated_records_method_name)
    return records.collect do |record|
      record.public_send(relationship.resource_klass._primary_key)
    end
  end

  # Returns array of instantiated related resource objects
  define_on_resource relationship_name do |options = {}|
    relationship = self.class._relationships[relationship_name]

    resource_klass = relationship.resource_klass
    records = public_send(associated_records_method_name, options)

    return records.collect do |record|
      if relationship.polymorphic?
        resource_klass = self.class.resource_for_model(record)
      end
      resource_klass.new(record, @context)
    end
  end
end

#define_foreign_key_setter(foreign_key) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 42

def define_foreign_key_setter(foreign_key)
  define_on_resource "#{foreign_key}=" do |value|
    @model.method("#{foreign_key}=").call(value)
  end
  foreign_key
end

#define_on_resource(method_name, &block) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 162

def define_on_resource(method_name, &block)
  return if @resource_class.method_defined?(method_name)
  @resource_class.inject_method_definition(method_name, block)
end

#define_relationship_methods(relationship_name) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 13

def define_relationship_methods(relationship_name)
  # Initialize from an ActiveRecord model's properties
  if model_class && model_class.ancestors.collect{|ancestor| ancestor.name}.include?('ActiveRecord::Base')
    model_association = model_class.reflect_on_association(relationship_name)
    if model_association
      options[:class_name] ||= model_association.class_name
    end
  end

  relationship = register_relationship(
    relationship_name,
    relationship_class.new(relationship_name, options)
  )

  foreign_key = define_foreign_key_setter(relationship.foreign_key)

  case relationship
  when JSONAPI::Relationship::ToOne
    associated = define_resource_relationship_accessor(:one, relationship_name)
    args = [relationship, foreign_key, associated, relationship_name]

    relationship.belongs_to? ? build_belongs_to(*args) : build_has_one(*args)
  when JSONAPI::Relationship::ToMany
    associated = define_resource_relationship_accessor(:many, relationship_name)

    build_to_many(relationship, foreign_key, associated, relationship_name)
  end
end

#define_resource_relationship_accessor(type, relationship_name) ⇒ Object 



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# File 'lib/jsonapi/relationship_builder.rb', line 49

def define_resource_relationship_accessor(type, relationship_name)
  associated_records_method_name = {
    one:  "record_for_#{relationship_name}",
    many: "records_for_#{relationship_name}"
  }
  .fetch(type)

  define_on_resource associated_records_method_name do |options = {}|
    relationship = self.class._relationships[relationship_name]
    relation_name = relationship.relation_name(context: @context)
    records = records_for(relation_name)

    resource_klass = relationship.resource_klass

    filters = options.fetch(:filters, {})
    unless filters.nil? || filters.empty?
      records = resource_klass.apply_filters(records, filters, options)
    end

    sort_criteria =  options.fetch(:sort_criteria, {})
    unless sort_criteria.nil? || sort_criteria.empty?
      order_options = relationship.resource_klass.construct_order_options(sort_criteria)
      records = resource_klass.apply_sort(records, order_options, @context)
    end

    paginator = options[:paginator]
    if paginator
      records = resource_klass.apply_pagination(records, paginator, order_options)
    end

    records
  end

  associated_records_method_name
end