Module: JSONAPI::Serializer

Defined in:
lib/jsonapi-serializers.rb,
lib/jsonapi-serializers/version.rb,
lib/jsonapi-serializers/serializer.rb

Defined Under Namespace

Modules: ClassMethods, InstanceMethods Classes: AmbiguousCollectionError, Error, InvalidIncludeError

Constant Summary collapse

VERSION = 
'1.0.1'

Class Method Summary collapse

Class Method Details

.activemodel_errors(raw_errors) ⇒ Object 



377
378
379
380
381
 
# File 'lib/jsonapi-serializers/serializer.rb', line 377

def self.activemodel_errors(raw_errors)
  raw_errors.to_hash(full_messages: true).inject([]) do |result, (attribute, messages)|
    result += messages.map { |message| single_error(attribute.to_s, message) }
  end
end

.find_recursive_relationships(root_object, root_inclusion_tree, results, options) ⇒ Object

Recursively find object relationships and returns a tree of related objects. Example return: 

['comments', '1'] => {object: <Comment>, include_linkages: ['author'],
['users', '1'] => <User>, include_linkages: [],
['users', '2'] => <User>, include_linkages: [],

}



449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
 
# File 'lib/jsonapi-serializers/serializer.rb', line 449

def self.find_recursive_relationships(root_object, root_inclusion_tree, results, options)
  root_inclusion_tree.each do |attribute_name, child_inclusion_tree|
    # Skip the sentinal value, but we need to preserve it for siblings.
    next if attribute_name == :_include

    serializer = JSONAPI::Serializer.find_serializer(root_object, options)
    unformatted_attr_name = serializer.unformat_name(attribute_name).to_sym

    # We know the name of this relationship, but we don't know where it is stored internally.
    # Check if it is a has_one or has_many relationship.
    object = nil
    is_collection = false
    is_valid_attr = false
    if serializer.has_one_relationships.has_key?(unformatted_attr_name)
      is_valid_attr = true
      attr_data = serializer.has_one_relationships[unformatted_attr_name]
      object = serializer.has_one_relationship(unformatted_attr_name, attr_data)
    elsif serializer.has_many_relationships.has_key?(unformatted_attr_name)
      is_valid_attr = true
      is_collection = true
      attr_data = serializer.has_many_relationships[unformatted_attr_name]
      object = serializer.has_many_relationship(unformatted_attr_name, attr_data)
    end

    if !is_valid_attr
      raise JSONAPI::Serializer::InvalidIncludeError.new(
        "'#{attribute_name}' is not a valid include.")
    end

    if attribute_name != serializer.format_name(attribute_name)
      expected_name = serializer.format_name(attribute_name)

      raise JSONAPI::Serializer::InvalidIncludeError.new(
        "'#{attribute_name}' is not a valid include.  Did you mean '#{expected_name}' ?"
      )
    end

    # We're finding relationships for compound documents, so skip anything that doesn't exist.
    next if object.nil?

    # Full linkage: a request for comments.author MUST automatically include comments
    # in the response.
    objects = is_collection ? object : [object]
    if child_inclusion_tree[:_include] == true
      # Include the current level objects if the _include attribute exists.
      # If it is not set, that indicates that this is an inner path and not a leaf and will
      # be followed by the recursion below.
      objects.each do |obj|
        obj_serializer = JSONAPI::Serializer.find_serializer(obj, options)
        # Use keys of ['posts', '1'] for the results to enforce uniqueness.
        # Spec: A compound document MUST NOT include more than one resource object for each
        # type and id pair.
        # http://jsonapi.org/format/#document-structure-compound-documents
        key = [obj_serializer.type, obj_serializer.id]

        # This is special: we know at this level if a child of this parent will also been
        # included in the compound document, so we can compute exactly what linkages should
        # be included by the object at this level. This satisfies this part of the spec:
        #
        # Spec: Resource linkage in a compound document allows a client to link together
        # all of the included resource objects without having to GET any relationship URLs.
        # http://jsonapi.org/format/#document-structure-resource-relationships
        current_child_includes = []
        inclusion_names = child_inclusion_tree.keys.reject { |k| k == :_include }
        inclusion_names.each do |inclusion_name|
          if child_inclusion_tree[inclusion_name][:_include]
            current_child_includes << inclusion_name
          end
        end

        # Special merge: we might see this object multiple times in the course of recursion,
        # so merge the include_linkages each time we see it to load all the relevant linkages.
        current_child_includes += results[key] && results[key][:include_linkages] || []
        current_child_includes.uniq!
        results[key] = {object: obj, include_linkages: current_child_includes}
      end
    end

    # Recurse deeper!
    if !child_inclusion_tree.empty?
      # For each object we just loaded, find all deeper recursive relationships.
      objects.each do |obj|
        find_recursive_relationships(obj, child_inclusion_tree, results, options)
      end
    end
  end
  nil
end

.find_serializer(object, options) ⇒ Object 



251
252
253
 
# File 'lib/jsonapi-serializers/serializer.rb', line 251

def self.find_serializer(object, options)
  find_serializer_class(object, options).new(object, options)
end

.find_serializer_class(object, options) ⇒ Object 



246
247
248
249
 
# File 'lib/jsonapi-serializers/serializer.rb', line 246

def self.find_serializer_class(object, options)
  class_name = find_serializer_class_name(object, options)
  class_name.constantize
end

.find_serializer_class_name(object, options) ⇒ Object 



236
237
238
239
240
241
242
243
244
 
# File 'lib/jsonapi-serializers/serializer.rb', line 236

def self.find_serializer_class_name(object, options)
  if options[:namespace]
    return "#{options[:namespace]}::#{object.class.name}Serializer"
  end
  if object.respond_to?(:jsonapi_serializer_class_name)
    return object.jsonapi_serializer_class_name.to_s
  end
  "#{object.class.name}Serializer"
end

.included(target) ⇒ Object 



6
7
8
9
10
11
12
 
# File 'lib/jsonapi-serializers/serializer.rb', line 6

def self.included(target)
  target.send(:include, InstanceMethods)
  target.extend ClassMethods
  target.class_eval do
    include JSONAPI::Attributes
  end
end

.is_activemodel_errors?(raw_errors) ⇒ Boolean

Returns:

  • (Boolean) 


383
384
385
 
# File 'lib/jsonapi-serializers/serializer.rb', line 383

def self.is_activemodel_errors?(raw_errors)
  raw_errors.respond_to?(:to_hash) && raw_errors.respond_to?(:full_messages)
end

.merge_relationship_path(path, data) ⇒ Object 



556
557
558
559
560
561
562
563
564
565
 
# File 'lib/jsonapi-serializers/serializer.rb', line 556

def self.merge_relationship_path(path, data)
  parts = path.split('.', 2)
  current_level = parts[0].strip
  data[current_level] ||= {_include: true}

  if parts.length == 2
    # Need to recurse more.
    merge_relationship_path(parts[1], data[current_level])
  end
end

.parse_relationship_paths(paths) ⇒ Object

Takes a list of relationship paths and returns a hash as deep as the given paths. The _include: true is a sentinal value that specifies whether the parent level should be included.

Example:

Given: ['author', 'comments', 'comments.user']
Returns: {
  'author' => {_include: true},
  'comments' => {_include: true, 'user' => {_include: true}},
}



549
550
551
552
553
 
# File 'lib/jsonapi-serializers/serializer.rb', line 549

def self.parse_relationship_paths(paths)
  relationships = {}
  paths.each { |path| merge_relationship_path(path, relationships) }
  relationships
end

.serialize(objects, options = {}) ⇒ Object 



255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
 
# File 'lib/jsonapi-serializers/serializer.rb', line 255

def self.serialize(objects, options = {})
  # Normalize option strings to symbols.
  options[:is_collection] = options.delete('is_collection') || options[:is_collection] || false
  options[:include] = options.delete('include') || options[:include]
  options[:serializer] = options.delete('serializer') || options[:serializer]
  options[:namespace] = options.delete('namespace') || options[:namespace]
  options[:context] = options.delete('context') || options[:context] || {}
  options[:skip_collection_check] = options.delete('skip_collection_check') || options[:skip_collection_check] || false
  options[:base_url] = options.delete('base_url') || options[:base_url]
  options[:jsonapi] = options.delete('jsonapi') || options[:jsonapi]
  options[:meta] = options.delete('meta') || options[:meta]
  options[:links] = options.delete('links') || options[:links]
  options[:fields] = options.delete('fields') || options[:fields] || {}

  # Deprecated: use serialize_errors method instead
  options[:errors] = options.delete('errors') || options[:errors]

  # Normalize includes.
  includes = options[:include]
  includes = (includes.is_a?(String) ? includes.split(',') : includes).uniq if includes

  # Transforms input so that the comma-separated fields are separate symbols in array
  # and keys are stringified
  # Example:
  # {posts: 'title,author,long_comments'} => {'posts' => [:title, :author, :long_comments]}
  # {posts: ['title', 'author', 'long_comments'} => {'posts' => [:title, :author, :long_comments]}
  #
  fields = {}
  # Normalize fields to accept a comma-separated string or an array of strings.
  options[:fields].map do |type, whitelisted_fields|
    whitelisted_fields = [whitelisted_fields] if whitelisted_fields.is_a?(Symbol)
    whitelisted_fields = whitelisted_fields.split(',') if whitelisted_fields.is_a?(String)
    fields[type.to_s] = whitelisted_fields.map(&:to_sym)
  end

  # An internal-only structure that is passed through serializers as they are created.
  passthrough_options = {
    context: options[:context],
    serializer: options[:serializer],
    namespace: options[:namespace],
    include: includes,
    fields: fields,
    base_url: options[:base_url]
  }

  if !options[:skip_collection_check] && options[:is_collection] && !objects.respond_to?(:each)
    raise JSONAPI::Serializer::AmbiguousCollectionError.new(
      'Attempted to serialize a single object as a collection.')
  end

  # Automatically include linkage data for any relation that is also included.
  if includes
    include_linkages = includes.map { |key| key.to_s.split('.').first }
    passthrough_options[:include_linkages] = include_linkages
  end

  # Spec: Primary data MUST be either:
  # - a single resource object or null, for requests that target single resources.
  # - an array of resource objects or an empty array ([]), for resource collections.
  # http://jsonapi.org/format/#document-structure-top-level
  if options[:is_collection] && !objects.any?
    primary_data = []
  elsif !options[:is_collection] && objects.nil?
    primary_data = nil
  elsif options[:is_collection]
    # Have object collection.
    primary_data = serialize_primary_multi(objects, passthrough_options)
  else
    # Duck-typing check for a collection being passed without is_collection true.
    # We always must be told if serializing a collection because the JSON:API spec distinguishes
    # how to serialize null single resources vs. empty collections.
    if !options[:skip_collection_check] && objects.respond_to?(:each)
      raise JSONAPI::Serializer::AmbiguousCollectionError.new(
        'Must provide `is_collection: true` to `serialize` when serializing collections.')
    end
    # Have single object.
    primary_data = serialize_primary(objects, passthrough_options)
  end
  result = {
    'data' => primary_data,
  }
  result['jsonapi'] = options[:jsonapi] if options[:jsonapi]
  result['meta'] = options[:meta] if options[:meta]
  result['links'] = options[:links] if options[:links]
  result['errors'] = options[:errors] if options[:errors]

  # If 'include' relationships are given, recursively find and include each object.
  if includes
    relationship_data = {}
    inclusion_tree = parse_relationship_paths(includes)

    # Given all the primary objects (either the single root object or collection of objects),
    # recursively search and find related associations that were specified as includes.
    objects = options[:is_collection] ? objects.to_a : [objects]
    objects.compact.each do |obj|
      # Use the mutability of relationship_data as the return datastructure to take advantage
      # of the internal special merging logic.
      find_recursive_relationships(obj, inclusion_tree, relationship_data, passthrough_options)
    end

    result['included'] = relationship_data.map do |_, data|
      included_passthrough_options = {}
      included_passthrough_options[:base_url] = passthrough_options[:base_url]
      included_passthrough_options[:context] = passthrough_options[:context]
      included_passthrough_options[:fields] = passthrough_options[:fields]
      included_passthrough_options[:serializer] = find_serializer_class(data[:object], options)
      included_passthrough_options[:namespace] = passthrough_options[:namespace]
      included_passthrough_options[:include_linkages] = data[:include_linkages]
      serialize_primary(data[:object], included_passthrough_options)
    end
  end
  result
end

.serialize_errors(raw_errors) ⇒ Object 



369
370
371
372
373
374
375
 
# File 'lib/jsonapi-serializers/serializer.rb', line 369

def self.serialize_errors(raw_errors)
  if is_activemodel_errors?(raw_errors)
    {'errors' => activemodel_errors(raw_errors)}
  else
    {'errors' => raw_errors}
  end
end

.serialize_primary(object, options = {}) ⇒ Object 



396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
 
# File 'lib/jsonapi-serializers/serializer.rb', line 396

def self.serialize_primary(object, options = {})
  serializer_class = options[:serializer] || find_serializer_class(object, options)

  # Spec: Primary data MUST be either:
  # - a single resource object or null, for requests that target single resources.
  # http://jsonapi.org/format/#document-structure-top-level
  return if object.nil?

  serializer = serializer_class.new(object, options)
  data = {
    'type' => serializer.type.to_s,
  }

  # "The id member is not required when the resource object originates at the client
  #  and represents a new resource to be created on the server."
  # http://jsonapi.org/format/#document-resource-objects
  # We'll assume that if the id is blank, it means the resource is to be created.
  data['id'] = serializer.id.to_s if serializer.id && !serializer.id.empty?

  # Merge in optional top-level members if they are non-nil.
  # http://jsonapi.org/format/#document-structure-resource-objects
  # Call the methods once now to avoid calling them twice when evaluating the if's below.
  attributes = serializer.attributes
  links = serializer.links
  relationships = serializer.relationships
  jsonapi = serializer.jsonapi
  meta = serializer.meta
  data['attributes'] = attributes if !attributes.empty?
  data['links'] = links if !links.empty?
  data['relationships'] = relationships if !relationships.empty?
  data['jsonapi'] = jsonapi if !jsonapi.nil?
  data['meta'] = meta if !meta.nil?
  data
end

.serialize_primary_multi(objects, options = {}) ⇒ Object 



432
433
434
435
436
437
438
439
 
# File 'lib/jsonapi-serializers/serializer.rb', line 432

def self.serialize_primary_multi(objects, options = {})
  # Spec: Primary data MUST be either:
  # - an array of resource objects or an empty array ([]), for resource collections.
  # http://jsonapi.org/format/#document-structure-top-level
  return [] if !objects.any?

  objects.map { |obj| serialize_primary(obj, options) }
end

.single_error(attribute, message) ⇒ Object 



387
388
389
390
391
392
393
394
 
# File 'lib/jsonapi-serializers/serializer.rb', line 387

def self.single_error(attribute, message)
  {
    'source' => {
      'pointer' => "/data/attributes/#{attribute.dasherize}"
    },
    'detail' => message
  }
end