Merge branch 'fix/labels-milestones-import' into 'master'

Fix Importing labels and milestones associations - Import/Export

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19510 and https://gitlab.com/gitlab-org/gitlab-ce/issues/19447
- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5426
Signed-off-by: Rémy Coutable <remy@rymai.me>

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.10.3 (unreleased)
+  - Fix Import/Export issue importing milestones and labels not associated properly. !5426
 
 v 8.10.2
   - User can now search branches by name. !5144

app/models/label_link.rb

 class LabelLink < ActiveRecord::Base
+  include Importable
+
   belongs_to :target, polymorphic: true
   belongs_to :label
 
-  validates :target, presence: true
-  validates :label, presence: true
+  validates :target, presence: true, unless: :importing?
+  validates :label, presence: true, unless: :importing?
 end

app/models/project.rb

@@ -1238,6 +1238,16 @@ class Project < ActiveRecord::Base
       authorized_for_user_by_shared_projects?(user, min_access_level)
   end
 
+  def append_or_update_attribute(name, value)
+    old_values = public_send(name.to_s)
+
+    if Project.reflect_on_association(name).try(:macro) == :has_many && old_values.any?
+      update_attribute(name, old_values + value)
+    else
+      update_attribute(name, value)
+    end
+  end
+
   private
 
   def authorized_for_user_by_group?(user, min_access_level)

lib/gitlab/import_export.rb

@@ -2,7 +2,7 @@ module Gitlab
   module ImportExport
     extend self
 
-    VERSION = '0.1.2'
+    VERSION = '0.1.3'
     FILENAME_LIMIT = 50
 
     def export_path(relative_path:)

lib/gitlab/import_export/import_export.yml

@@ -5,8 +5,9 @@ project_tree:
     - notes:
       - :author
       - :events
-  - :labels
-  - milestones:
+    - label_links:
+      - :label
+    - milestone:
       - :events
   - snippets:
     - notes:
@@ -20,6 +21,10 @@ project_tree:
       - :events
     - :merge_request_diff
     - :events
+    - label_links:
+      - :label
+    - milestone:
+      - :events
   - pipelines:
     - notes:
       - :author
@@ -31,6 +36,9 @@ project_tree:
   - :services
   - :hooks
   - :protected_branches
+  - :labels
+  - milestones:
+    - :events
 
 # Only include the following attributes for the models specified.
 included_attributes:
@@ -55,6 +63,10 @@ excluded_attributes:
     - :expired_at
   merge_request_diff:
     - :st_diffs
+  issues:
+    - :milestone_id
+  merge_requests:
+    - :milestone_id
 
 methods:
   statuses:

lib/gitlab/import_export/json_hash_builder.rb

+module Gitlab
+  module ImportExport
+    # Generates a hash that conforms with http://apidock.com/rails/Hash/to_json
+    # and its peculiar options.
+    class JsonHashBuilder
+      def self.build(model_objects, attributes_finder)
+        new(model_objects, attributes_finder).build
+      end
+
+      def initialize(model_objects, attributes_finder)
+        @model_objects = model_objects
+        @attributes_finder = attributes_finder
+      end
+
+      def build
+        process_model_objects(@model_objects)
+      end
+
+      private
+
+      # Called when the model is actually a hash containing other relations (more models)
+      # Returns the config in the right format for calling +to_json+
+      #
+      # +model_object_hash+ - A model relationship such as:
+      #   {:merge_requests=>[:merge_request_diff, :notes]}
+      def process_model_objects(model_object_hash)
+        json_config_hash = {}
+        current_key = model_object_hash.keys.first
+
+        model_object_hash.values.flatten.each do |model_object|
+          @attributes_finder.parse(current_key) { |hash| json_config_hash[current_key] ||= hash }
+          handle_model_object(current_key, model_object, json_config_hash)
+        end
+
+        json_config_hash
+      end
+
+      # Creates or adds to an existing hash an individual model or list
+      #
+      # +current_key+ main model that will be a key in the hash
+      # +model_object+ model or list of models to include in the hash
+      # +json_config_hash+ the original hash containing the root model
+      def handle_model_object(current_key, model_object, json_config_hash)
+        model_or_sub_model = model_object.is_a?(Hash) ? process_model_objects(model_object) : model_object
+
+        if json_config_hash[current_key]
+          add_model_value(current_key, model_or_sub_model, json_config_hash)
+        else
+          create_model_value(current_key, model_or_sub_model, json_config_hash)
+        end
+      end
+
+      # Constructs a new hash that will hold the configuration for that particular object
+      # It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
+      #
+      # +current_key+ main model that will be a key in the hash
+      # +value+ existing model to be included in the hash
+      # +json_config_hash+ the original hash containing the root model
+      def create_model_value(current_key, value, json_config_hash)
+        parsed_hash = { include: value }
+        parse_hash(value, parsed_hash)
+
+        json_config_hash[current_key] = parsed_hash
+      end
+
+      # Calls attributes finder to parse the hash and add any attributes to it
+      #
+      # +value+ existing model to be included in the hash
+      # +parsed_hash+ the original hash
+      def parse_hash(value, parsed_hash)
+        @attributes_finder.parse(value) do |hash|
+          parsed_hash = { include: hash_or_merge(value, hash) }
+        end
+      end
+
+      # Adds new model configuration to an existing hash with key +current_key+
+      # It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
+      #
+      # +current_key+ main model that will be a key in the hash
+      # +value+ existing model to be included in the hash
+      # +json_config_hash+ the original hash containing the root model
+      def add_model_value(current_key, value, json_config_hash)
+        @attributes_finder.parse(value) { |hash| value = { value => hash } }
+
+        add_to_array(current_key, json_config_hash, value)
+      end
+
+      # Adds new model configuration to an existing hash with key +current_key+
+      # it creates a new array if it was previously a single value
+      #
+      # +current_key+ main model that will be a key in the hash
+      # +value+ existing model to be included in the hash
+      # +json_config_hash+ the original hash containing the root model
+      def add_to_array(current_key, json_config_hash, value)
+        old_values = json_config_hash[current_key][:include]
+
+        json_config_hash[current_key][:include] = ([old_values] + [value]).compact.flatten
+      end
+
+      # Construct a new hash or merge with an existing one a model configuration
+      # This is to fulfil +to_json+ requirements.
+      #
+      # +hash+ hash containing configuration generated mainly from +@attributes_finder+
+      # +value+ existing model to be included in the hash
+      def hash_or_merge(value, hash)
+        value.is_a?(Hash) ? value.merge(hash) : { value => hash }
+      end
+    end
+  end
+end

lib/gitlab/import_export/project_tree_restorer.rb

@@ -47,7 +47,7 @@ module Gitlab
 
           relation_key = relation.is_a?(Hash) ? relation.keys.first : relation
           relation_hash = create_relation(relation_key, @tree_hash[relation_key.to_s])
-          saved << restored_project.update_attribute(relation_key, relation_hash)
+          saved << restored_project.append_or_update_attribute(relation_key, relation_hash)
         end
         saved.all?
       end
@@ -78,7 +78,7 @@ module Gitlab
         relation_key = relation.keys.first.to_s
         return if tree_hash[relation_key].blank?
 
-        tree_hash[relation_key].each do |relation_item|
+        [tree_hash[relation_key]].flatten.each do |relation_item|
           relation.values.flatten.each do |sub_relation|
             # We just use author to get the user ID, do not attempt to create an instance.
             next if sub_relation == :author

lib/gitlab/import_export/reader.rb

@@ -29,87 +29,12 @@ module Gitlab
       def build_hash(model_list)
         model_list.map do |model_objects|
           if model_objects.is_a?(Hash)
-            build_json_config_hash(model_objects)
+            Gitlab::ImportExport::JsonHashBuilder.build(model_objects, @attributes_finder)
           else
             @attributes_finder.find(model_objects)
           end
         end
       end
-
-      # Called when the model is actually a hash containing other relations (more models)
-      # Returns the config in the right format for calling +to_json+
-      # +model_object_hash+ - A model relationship such as:
-      #   {:merge_requests=>[:merge_request_diff, :notes]}
-      def build_json_config_hash(model_object_hash)
-        @json_config_hash = {}
-
-        model_object_hash.values.flatten.each do |model_object|
-          current_key = model_object_hash.keys.first
-
-          @attributes_finder.parse(current_key) { |hash| @json_config_hash[current_key] ||= hash }
-
-          handle_model_object(current_key, model_object)
-          process_sub_model(current_key, model_object) if model_object.is_a?(Hash)
-        end
-        @json_config_hash
-      end
-
-      # If the model is a hash, process the sub_models, which could also be hashes
-      # If there is a list, add to an existing array, otherwise use hash syntax
-      # +current_key+ main model that will be a key in the hash
-      # +model_object+ model or list of models to include in the hash
-      def process_sub_model(current_key, model_object)
-        sub_model_json = build_json_config_hash(model_object).dup
-        @json_config_hash.slice!(current_key)
-
-        if @json_config_hash[current_key] && @json_config_hash[current_key][:include]
-          @json_config_hash[current_key][:include] << sub_model_json
-        else
-          @json_config_hash[current_key] = { include: sub_model_json }
-        end
-      end
-
-      # Creates or adds to an existing hash an individual model or list
-      # +current_key+ main model that will be a key in the hash
-      # +model_object+ model or list of models to include in the hash
-      def handle_model_object(current_key, model_object)
-        if @json_config_hash[current_key]
-          add_model_value(current_key, model_object)
-        else
-          create_model_value(current_key, model_object)
-        end
-      end
-
-      # Constructs a new hash that will hold the configuration for that particular object
-      # It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
-      # +current_key+ main model that will be a key in the hash
-      # +value+ existing model to be included in the hash
-      def create_model_value(current_key, value)
-        parsed_hash = { include: value }
-
-        @attributes_finder.parse(value) do |hash|
-          parsed_hash = { include: hash_or_merge(value, hash) }
-        end
-        @json_config_hash[current_key] = parsed_hash
-      end
-
-      # Adds new model configuration to an existing hash with key +current_key+
-      # It may include exceptions or other attribute detail configuration, parsed by +@attributes_finder+
-      # +current_key+ main model that will be a key in the hash
-      # +value+ existing model to be included in the hash
-      def add_model_value(current_key, value)
-        @attributes_finder.parse(value) { |hash| value = { value => hash } }
-        old_values = @json_config_hash[current_key][:include]
-        @json_config_hash[current_key][:include] = ([old_values] + [value]).compact.flatten
-      end
-
-      # Construct a new hash or merge with an existing one a model configuration
-      # This is to fulfil +to_json+ requirements.
-      # +value+ existing model to be included in the hash
-      # +hash+ hash containing configuration generated mainly from +@attributes_finder+
-      def hash_or_merge(value, hash)
-        value.is_a?(Hash) ? value.merge(hash) : { value => hash }
-      end
     end
   end
 end

lib/gitlab/import_export/relation_factory.rb

@@ -13,6 +13,10 @@ module Gitlab
 
       BUILD_MODELS = %w[Ci::Build commit_status].freeze
 
+      IMPORTED_OBJECT_MAX_RETRIES = 5.freeze
+
+      EXISTING_OBJECT_CHECK = %i[milestone milestones label labels].freeze
+
       def self.create(*args)
         new(*args).create
       end
@@ -22,24 +26,35 @@ module Gitlab
         @relation_hash = relation_hash.except('id', 'noteable_id')
         @members_mapper = members_mapper
         @user = user
+        @imported_object_retries = 0
       end
 
       # Creates an object from an actual model with name "relation_sym" with params from
       # the relation_hash, updating references with new object IDs, mapping users using
       # the "members_mapper" object, also updating notes if required.
       def create
-        set_note_author if @relation_name == :notes
+        setup_models
+
+        generate_imported_object
+      end
+
+      private
+
+      def setup_models
+        if @relation_name == :notes
+          set_note_author
+
+          # TODO: note attatchments not supported yet
+          @relation_hash['attachment'] = nil
+        end
+
         update_user_references
         update_project_references
         reset_ci_tokens if @relation_name == 'Ci::Trigger'
         @relation_hash['data'].deep_symbolize_keys! if @relation_name == :events && @relation_hash['data']
         set_st_diffs if @relation_name == :merge_request_diff
-
-        generate_imported_object
       end
 
-      private
-
       def update_user_references
         USER_REFERENCES.each do |reference|
           if @relation_hash[reference]
@@ -112,10 +127,14 @@ module Gitlab
       end
 
       def imported_object
-        imported_object = relation_class.new(parsed_relation_hash)
-        yield(imported_object) if block_given?
-        imported_object.importing = true if imported_object.respond_to?(:importing)
-        imported_object
+        yield(existing_or_new_object) if block_given?
+        existing_or_new_object.importing = true if existing_or_new_object.respond_to?(:importing)
+        existing_or_new_object
+      rescue ActiveRecord::RecordNotUnique
+        # as the operation is not atomic, retry in the unlikely scenario an INSERT is
+        # performed on the same object between the SELECT and the INSERT
+        @imported_object_retries += 1
+        retry if @imported_object_retries < IMPORTED_OBJECT_MAX_RETRIES
       end
 
       def update_note_for_missing_author(author_name)
@@ -134,6 +153,20 @@ module Gitlab
       def set_st_diffs
         @relation_hash['st_diffs'] = @relation_hash.delete('utf8_st_diffs')
       end
+
+      def existing_or_new_object
+        # Only find existing records to avoid mapping tables such as milestones
+        # Otherwise always create the record, skipping the extra SELECT clause.
+        @existing_or_new_object ||= begin
+          if EXISTING_OBJECT_CHECK.include?(@relation_name)
+            existing_object = relation_class.find_or_initialize_by(parsed_relation_hash.slice('title', 'project_id'))
+            existing_object.assign_attributes(parsed_relation_hash)
+            existing_object
+          else
+            relation_class.new(parsed_relation_hash)
+          end
+        end
+      end
     end
   end
 end

spec/lib/gitlab/import_export/project.json

@@ -18,7 +18,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Aliquam enim illo et possimus.",
-      "milestone_id": 18,
       "state": "opened",
       "iid": 10,
       "updated_by_id": null,
@@ -27,6 +26,52 @@
       "due_date": null,
       "moved_to_id": null,
       "test_ee_field": "test",
+      "milestone": {
+        "id": 1,
+        "title": "v0.0",
+        "project_id": 8,
+        "description": "test milestone",
+        "due_date": null,
+        "created_at": "2016-06-14T15:02:04.415Z",
+        "updated_at": "2016-06-14T15:02:04.415Z",
+        "state": "active",
+        "iid": 1,
+        "events": [
+          {
+            "id": 487,
+            "target_type": "Milestone",
+            "target_id": 1,
+            "title": null,
+            "data": null,
+            "project_id": 46,
+            "created_at": "2016-06-14T15:02:04.418Z",
+            "updated_at": "2016-06-14T15:02:04.418Z",
+            "action": 1,
+            "author_id": 18
+          }
+        ]
+      },
+      "label_links": [
+        {
+          "id": 2,
+          "label_id": 2,
+          "target_id": 3,
+          "target_type": "Issue",
+          "created_at": "2016-07-22T08:57:02.840Z",
+          "updated_at": "2016-07-22T08:57:02.840Z",
+          "label": {
+            "id": 2,
+            "title": "test2",
+            "color": "#428bca",
+            "project_id": 8,
+            "created_at": "2016-07-22T08:55:44.161Z",
+            "updated_at": "2016-07-22T08:55:44.161Z",
+            "template": false,
+            "description": "",
+            "priority": null
+          }
+        }
+      ],
       "notes": [
         {
           "id": 351,
@@ -233,7 +278,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Voluptate vel reprehenderit facilis omnis voluptas magnam tenetur.",
-      "milestone_id": 16,
       "state": "opened",
       "iid": 9,
       "updated_by_id": null,
@@ -447,7 +491,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Ea recusandae neque autem tempora.",
-      "milestone_id": 16,
       "state": "closed",
       "iid": 8,
       "updated_by_id": null,
@@ -661,7 +704,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Maiores architecto quos in dolorem.",
-      "milestone_id": 17,
       "state": "opened",
       "iid": 7,
       "updated_by_id": null,
@@ -875,7 +917,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Ut aut ut et tenetur velit aut id modi.",
-      "milestone_id": 16,
       "state": "opened",
       "iid": 6,
       "updated_by_id": null,
@@ -1089,7 +1130,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Dicta nisi nihil non ipsa velit.",
-      "milestone_id": 20,
       "state": "closed",
       "iid": 5,
       "updated_by_id": null,
@@ -1303,7 +1343,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Ut et explicabo vel voluptatem consequuntur ut sed.",
-      "milestone_id": 19,
       "state": "closed",
       "iid": 4,
       "updated_by_id": null,
@@ -1517,7 +1556,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Non asperiores velit accusantium voluptate.",
-      "milestone_id": 18,
       "state": "closed",
       "iid": 3,
       "updated_by_id": null,
@@ -1731,7 +1769,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Molestiae corporis magnam et fugit aliquid nulla quia.",
-      "milestone_id": 17,
       "state": "closed",
       "iid": 2,
       "updated_by_id": null,
@@ -1945,7 +1982,6 @@
       "position": 0,
       "branch_name": null,
       "description": "Quod ad architecto qui est sed quia.",
-      "milestone_id": 20,
       "state": "closed",
       "iid": 1,
       "updated_by_id": null,
@@ -2259,117 +2295,6 @@
           "author_id": 25
         }
       ]
-    },
-    {
-      "id": 18,
-      "title": "v2.0",
-      "project_id": 5,
-      "description": "Error dolorem rerum aut nulla.",
-      "due_date": null,
-      "created_at": "2016-06-14T15:02:04.576Z",
-      "updated_at": "2016-06-14T15:02:04.576Z",
-      "state": "active",
-      "iid": 3,
-      "events": [
-        {
-          "id": 242,
-          "target_type": "Milestone",
-          "target_id": 18,
-          "title": null,
-          "data": null,
-          "project_id": 36,
-          "created_at": "2016-06-14T15:02:04.579Z",
-          "updated_at": "2016-06-14T15:02:04.579Z",
-          "action": 1,
-          "author_id": 1
-        },
-        {
-          "id": 58,
-          "target_type": "Milestone",
-          "target_id": 18,
-          "title": null,
-          "data": null,
-          "project_id": 5,
-          "created_at": "2016-06-14T15:02:04.579Z",
-          "updated_at": "2016-06-14T15:02:04.579Z",
-          "action": 1,
-          "author_id": 22
-        }
-      ]
-    },
-    {
-      "id": 17,
-      "title": "v1.0",
-      "project_id": 5,
-      "description": "Molestiae perspiciatis voluptates doloremque commodi veniam consequatur.",
-      "due_date": null,
-      "created_at": "2016-06-14T15:02:04.569Z",
-      "updated_at": "2016-06-14T15:02:04.569Z",
-      "state": "active",
-      "iid": 2,
-      "events": [
-        {
-          "id": 243,
-          "target_type": "Milestone",
-          "target_id": 17,
-          "title": null,
-          "data": null,
-          "project_id": 36,
-          "created_at": "2016-06-14T15:02:04.570Z",
-          "updated_at": "2016-06-14T15:02:04.570Z",
-          "action": 1,
-          "author_id": 1
-        },
-        {
-          "id": 57,
-          "target_type": "Milestone",
-          "target_id": 17,
-          "title": null,
-          "data": null,
-          "project_id": 5,
-          "created_at": "2016-06-14T15:02:04.570Z",
-          "updated_at": "2016-06-14T15:02:04.570Z",
-          "action": 1,
-          "author_id": 20
-        }
-      ]
-    },
-    {
-      "id": 16,
-      "title": "v0.0",
-      "project_id": 5,
-      "description": "Velit numquam et sed sit.",
-      "due_date": null,
-      "created_at": "2016-06-14T15:02:04.561Z",
-      "updated_at": "2016-06-14T15:02:04.561Z",
-      "state": "closed",
-      "iid": 1,
-      "events": [
-        {
-          "id": 244,
-          "target_type": "Milestone",
-          "target_id": 16,
-          "title": null,
-          "data": null,
-          "project_id": 36,
-          "created_at": "2016-06-14T15:02:04.563Z",
-          "updated_at": "2016-06-14T15:02:04.563Z",
-          "action": 1,
-          "author_id": 26
-        },
-        {
-          "id": 56,
-          "target_type": "Milestone",
-          "target_id": 16,
-          "title": null,
-          "data": null,
-          "project_id": 5,
-          "created_at": "2016-06-14T15:02:04.563Z",
-          "updated_at": "2016-06-14T15:02:04.563Z",
-          "action": 1,
-          "author_id": 26
-        }
-      ]
     }
   ],
   "snippets": [
@@ -2471,7 +2396,6 @@
       "title": "Cannot be automatically merged",
       "created_at": "2016-06-14T15:02:36.568Z",
       "updated_at": "2016-06-14T15:02:56.815Z",
-      "milestone_id": null,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -2909,7 +2833,6 @@
       "title": "Can be automatically merged",
       "created_at": "2016-06-14T15:02:36.418Z",
       "updated_at": "2016-06-14T15:02:57.013Z",
-      "milestone_id": null,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -3194,7 +3117,6 @@
       "title": "Qui accusantium et inventore facilis doloribus occaecati officiis.",
       "created_at": "2016-06-14T15:02:25.168Z",
       "updated_at": "2016-06-14T15:02:59.521Z",
-      "milestone_id": 17,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -3479,7 +3401,6 @@
       "title": "In voluptas aut sequi voluptatem ullam vel corporis illum consequatur.",
       "created_at": "2016-06-14T15:02:24.760Z",
       "updated_at": "2016-06-14T15:02:59.749Z",
-      "milestone_id": 20,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -4170,7 +4091,6 @@
       "title": "Voluptates consequatur eius nemo amet libero animi illum delectus tempore.",
       "created_at": "2016-06-14T15:02:24.415Z",
       "updated_at": "2016-06-14T15:02:59.958Z",
-      "milestone_id": 17,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -4719,7 +4639,6 @@
       "title": "In a rerum harum nihil accusamus aut quia nobis non.",
       "created_at": "2016-06-14T15:02:24.000Z",
       "updated_at": "2016-06-14T15:03:00.225Z",
-      "milestone_id": 19,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -5219,7 +5138,6 @@
       "title": "Corporis provident similique perspiciatis dolores eos animi.",
       "created_at": "2016-06-14T15:02:23.767Z",
       "updated_at": "2016-06-14T15:03:00.475Z",
-      "milestone_id": 18,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -5480,7 +5398,6 @@
       "title": "Eligendi reprehenderit doloribus quia et sit id.",
       "created_at": "2016-06-14T15:02:23.014Z",
       "updated_at": "2016-06-14T15:03:00.685Z",
-      "milestone_id": 20,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,
@@ -6171,7 +6088,6 @@
       "title": "Et ipsam voluptas velit sequi illum ut.",
       "created_at": "2016-06-14T15:02:22.825Z",
       "updated_at": "2016-06-14T15:03:00.904Z",
-      "milestone_id": 16,
       "state": "opened",
       "merge_status": "unchecked",
       "target_project_id": 5,

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -60,6 +60,18 @@ describe Gitlab::ImportExport::ProjectTreeRestorer, services: true do
 
         expect { restored_project_json }.to change(MergeRequestDiff.where.not(st_diffs: nil), :count).by(9)
       end
+
+      it 'has labels associated to label links, associated to issues' do
+        restored_project_json
+
+        expect(Label.first.label_links.first.target).not_to be_nil
+      end
+
+      it 'has milestones associated to issues' do
+        restored_project_json
+
+        expect(Milestone.find_by_description('test milestone').issues).not_to be_empty
+      end
     end
   end
 end

spec/lib/gitlab/import_export/project_tree_saver_spec.rb

@@ -31,10 +31,6 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
         expect(saved_project_json).to include({ "visibility_level" => 20 })
       end
 
-      it 'has events' do
-        expect(saved_project_json['milestones'].first['events']).not_to be_empty
-      end
-
       it 'has milestones' do
         expect(saved_project_json['milestones']).not_to be_empty
       end
@@ -43,8 +39,12 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
         expect(saved_project_json['merge_requests']).not_to be_empty
       end
 
-      it 'has labels' do
-        expect(saved_project_json['labels']).not_to be_empty
+      it 'has merge request\'s milestones' do
+        expect(saved_project_json['merge_requests'].first['milestone']).not_to be_empty
+      end
+
+      it 'has events' do
+        expect(saved_project_json['merge_requests'].first['milestone']['events']).not_to be_empty
       end
 
       it 'has snippets' do
@@ -103,6 +103,14 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
         expect(saved_project_json['pipelines'].first['notes']).not_to be_empty
       end
 
+      it 'has labels with no associations' do
+        expect(saved_project_json['labels']).not_to be_empty
+      end
+
+      it 'has labels associated to records' do
+        expect(saved_project_json['issues'].first['label_links'].first['label']).not_to be_empty
+      end
+
       it 'does not complain about non UTF-8 characters in MR diffs' do
         ActiveRecord::Base.connection.execute("UPDATE merge_request_diffs SET st_diffs = '---\n- :diff: !binary |-\n    LS0tIC9kZXYvbnVsbAorKysgYi9pbWFnZXMvbnVjb3IucGRmCkBAIC0wLDAg\n    KzEsMTY3OSBAQAorJVBERi0xLjUNJeLjz9MNCisxIDAgb2JqDTw8L01ldGFk\n    YXR'")
 
@@ -113,19 +121,19 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
 
   def setup_project
     issue = create(:issue, assignee: user)
-    label = create(:label)
     snippet = create(:project_snippet)
     release = create(:release)
 
     project = create(:project,
                      :public,
                      issues: [issue],
-                     labels: [label],
                      snippets: [snippet],
                      releases: [release]
                     )
-
-    merge_request = create(:merge_request, source_project: project)
+    label = create(:label, project: project)
+    create(:label_link, label: label, target: issue)
+    milestone = create(:milestone, project: project)
+    merge_request = create(:merge_request, source_project: project, milestone: milestone)
     commit_status = create(:commit_status, project: project)
 
     ci_pipeline = create(:ci_pipeline,
@@ -135,7 +143,7 @@ describe Gitlab::ImportExport::ProjectTreeSaver, services: true do
                        statuses: [commit_status])
 
     create(:ci_build, pipeline: ci_pipeline, project: project)
-    milestone = create(:milestone, project: project)
+    create(:milestone, project: project)
     create(:note, noteable: issue, project: project)
     create(:note, noteable: merge_request, project: project)
     create(:note, noteable: snippet, project: project)