From 44f14a07dadddf843610a4c25d03a3aef323d79a Mon Sep 17 00:00:00 2001
From: "Jeferson S. Brito" <jefersonsilva4k@hotmail.com>
Date: Sun, 15 Sep 2024 13:46:07 -0300
Subject: [PATCH] feat: add MindMap, Node and Edges

---
 api/app/controllers/mindmaps_controller.rb    |  17 +
 api/app/models/edge.rb                        |  11 +
 api/app/models/mind_map.rb                    |  20 +
 api/app/models/node.rb                        |  14 +
 api/app/models/user.rb                        |   1 +
 api/app/views/mindmaps/index.jbuilder         |   8 +
 api/app/views/mindmaps/show.jbuilder          |   6 +
 api/config/routes.rb                          |   1 +
 .../20240907184721_create_mind_maps.rb        |  13 +
 api/db/migrate/20240907184819_create_nodes.rb |  14 +
 api/db/migrate/20240907184914_create_edges.rb |  14 +
 .../20240915162642_add_graph_id_to_nodes.rb   |   5 +
 api/db/schema.rb                              | 366 ++++++++++--------
 api/spec/factories/edges.rb                   |   6 +
 api/spec/factories/mind_maps.rb               |   6 +
 api/spec/factories/nodes.rb                   |   6 +
 api/spec/models/edge_spec.rb                  |   7 +
 api/spec/models/mind_map_spec.rb              |   7 +
 api/spec/models/node_spec.rb                  |   7 +
 api/spec/requests/mind_map_spec.rb            |   9 +
 20 files changed, 371 insertions(+), 167 deletions(-)
 create mode 100644 api/app/controllers/mindmaps_controller.rb
 create mode 100644 api/app/models/edge.rb
 create mode 100644 api/app/models/mind_map.rb
 create mode 100644 api/app/models/node.rb
 create mode 100644 api/app/views/mindmaps/index.jbuilder
 create mode 100644 api/app/views/mindmaps/show.jbuilder
 create mode 100644 api/db/migrate/20240907184721_create_mind_maps.rb
 create mode 100644 api/db/migrate/20240907184819_create_nodes.rb
 create mode 100644 api/db/migrate/20240907184914_create_edges.rb
 create mode 100644 api/db/migrate/20240915162642_add_graph_id_to_nodes.rb
 create mode 100644 api/spec/factories/edges.rb
 create mode 100644 api/spec/factories/mind_maps.rb
 create mode 100644 api/spec/factories/nodes.rb
 create mode 100644 api/spec/models/edge_spec.rb
 create mode 100644 api/spec/models/mind_map_spec.rb
 create mode 100644 api/spec/models/node_spec.rb
 create mode 100644 api/spec/requests/mind_map_spec.rb

diff --git a/api/app/controllers/mindmaps_controller.rb b/api/app/controllers/mindmaps_controller.rb
new file mode 100644
index 0000000..4539d00
--- /dev/null
+++ b/api/app/controllers/mindmaps_controller.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class MindmapsController < ApplicationController
+  before_action :authenticate_request, only: :create
+
+  def show
+    @mm = MindMap.find(params[:id])
+  end
+
+  def index
+    @mmaps = MindMap.all
+  end
+
+  def create
+    # TBD
+  end
+end
diff --git a/api/app/models/edge.rb b/api/app/models/edge.rb
new file mode 100644
index 0000000..64442fc
--- /dev/null
+++ b/api/app/models/edge.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Edge < ApplicationRecord
+  belongs_to :from_node, class_name: 'Node'
+  belongs_to :to_node, class_name: 'Node'
+
+  validates :from_node_id, presence: true
+  validates :to_node_id, presence: true
+
+  scope :between, ->(from, to) { where(from_node_id: from.id, to_node_id: to.id) }
+end
diff --git a/api/app/models/mind_map.rb b/api/app/models/mind_map.rb
new file mode 100644
index 0000000..3d0b062
--- /dev/null
+++ b/api/app/models/mind_map.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class MindMap < ApplicationRecord
+  belongs_to :category
+  has_many :nodes, foreign_key: 'graph_id'
+
+  scope :for_category, ->(category) { where(category_id: category.id) }
+
+  def add_node(node)
+    node.update!(graph_id: self.id)
+  end
+
+  def remove_node(node)
+    node.update!(graph_id: nil)
+  end
+
+  def connect_nodes(from, to)
+    Edge.create(from_node: from, to_node: to)
+  end
+end
diff --git a/api/app/models/node.rb b/api/app/models/node.rb
new file mode 100644
index 0000000..bdd878f
--- /dev/null
+++ b/api/app/models/node.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class Node < ApplicationRecord
+  belongs_to :nodeable, polymorphic: true
+  belongs_to :graph, class_name: 'MindMap', foreign_key: 'graph_id', optional: true
+  
+  has_many :edges, dependent: :destroy
+  has_many :edges, foreign_key: 'to_node_id'
+
+  validates :nodeable_type, presence: true
+  validates :nodeable_id, presence: true
+
+  scope :related_to_exam, ->(exam) { where(nodeable_type: 'Exam', nodeable_id: exam.id) }
+end
diff --git a/api/app/models/user.rb b/api/app/models/user.rb
index 6a45bd5..2027bcf 100644
--- a/api/app/models/user.rb
+++ b/api/app/models/user.rb
@@ -10,5 +10,6 @@ class User < ApplicationRecord
 
   has_many :answer
   has_many :exams, through: :answer
+  has_many :mind_map
   has_one :garden
 end
diff --git a/api/app/views/mindmaps/index.jbuilder b/api/app/views/mindmaps/index.jbuilder
new file mode 100644
index 0000000..1f18443
--- /dev/null
+++ b/api/app/views/mindmaps/index.jbuilder
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+json.array! @mmaps do |map|
+  json.id map.id
+  json.name map.name
+  json.owner_id map.user_id
+  json.node_count map.node_ids.count
+end
diff --git a/api/app/views/mindmaps/show.jbuilder b/api/app/views/mindmaps/show.jbuilder
new file mode 100644
index 0000000..76ed5c6
--- /dev/null
+++ b/api/app/views/mindmaps/show.jbuilder
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+json.message 'Your mind map'
+json.name @mm.name
+json.category @mm.category.title
+json.nodes @mm.node_ids
diff --git a/api/config/routes.rb b/api/config/routes.rb
index e48bc68..6526821 100644
--- a/api/config/routes.rb
+++ b/api/config/routes.rb
@@ -32,5 +32,6 @@
       post '/journal/surprise_question', to: 'gardens#evaluate_surprise_question'
     end
     resources :trees, only: %i[index show]
+    resources :mindmaps
   end
 end
diff --git a/api/db/migrate/20240907184721_create_mind_maps.rb b/api/db/migrate/20240907184721_create_mind_maps.rb
new file mode 100644
index 0000000..0bc51f1
--- /dev/null
+++ b/api/db/migrate/20240907184721_create_mind_maps.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class CreateMindMaps < ActiveRecord::Migration[7.0]
+  def change
+    create_table :mind_maps do |t|
+      t.string :name
+      t.references :category, null: false, foreign_key: true
+      t.references :user, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end
diff --git a/api/db/migrate/20240907184819_create_nodes.rb b/api/db/migrate/20240907184819_create_nodes.rb
new file mode 100644
index 0000000..0aac71c
--- /dev/null
+++ b/api/db/migrate/20240907184819_create_nodes.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class CreateNodes < ActiveRecord::Migration[7.0]
+  def change
+    create_table :nodes do |t|
+      t.references :nodeable, polymorphic: true, null: false
+      t.integer :position
+
+      t.timestamps
+    end
+
+    add_index :nodes, %i[nodeable_type nodeable_id], name: 'index_nodes_on_nodeable_type_and_nodeable_id', unique: true
+  end
+end
diff --git a/api/db/migrate/20240907184914_create_edges.rb b/api/db/migrate/20240907184914_create_edges.rb
new file mode 100644
index 0000000..8d558e7
--- /dev/null
+++ b/api/db/migrate/20240907184914_create_edges.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+class CreateEdges < ActiveRecord::Migration[7.0]
+  def change
+    create_table :edges do |t|
+      t.references :from_node, null: false, foreign_key: { to_table: :nodes }
+      t.references :to_node, null: false, foreign_key: { to_table: :nodes }
+
+      t.timestamps
+    end
+
+    add_index :edges, %i[from_node_id to_node_id], name: 'index_edges_on_from_node_id_and_to_node_id', unique: true
+  end
+end
diff --git a/api/db/migrate/20240915162642_add_graph_id_to_nodes.rb b/api/db/migrate/20240915162642_add_graph_id_to_nodes.rb
new file mode 100644
index 0000000..76ec9d7
--- /dev/null
+++ b/api/db/migrate/20240915162642_add_graph_id_to_nodes.rb
@@ -0,0 +1,5 @@
+class AddGraphIdToNodes < ActiveRecord::Migration[7.0]
+  def change
+    add_column :nodes, :graph_id, :integer
+  end
+end
diff --git a/api/db/schema.rb b/api/db/schema.rb
index 4db6e29..9734c59 100644
--- a/api/db/schema.rb
+++ b/api/db/schema.rb
@@ -1,5 +1,3 @@
-# frozen_string_literal: true
-
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
@@ -12,170 +10,204 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 20_240_817_212_900) do
+ActiveRecord::Schema[7.0].define(version: 2024_09_15_162642) do
   # These are extensions that must be enabled in order to support this database
-  enable_extension 'plpgsql'
-
-  create_table 'active_storage_attachments', force: :cascade do |t|
-    t.string 'name', null: false
-    t.string 'record_type', null: false
-    t.bigint 'record_id', null: false
-    t.bigint 'blob_id', null: false
-    t.datetime 'created_at', null: false
-    t.index ['blob_id'], name: 'index_active_storage_attachments_on_blob_id'
-    t.index %w[record_type record_id name blob_id], name: 'index_active_storage_attachments_uniqueness',
-                                                    unique: true
-  end
-
-  create_table 'active_storage_blobs', force: :cascade do |t|
-    t.string 'key', null: false
-    t.string 'filename', null: false
-    t.string 'content_type'
-    t.text 'metadata'
-    t.string 'service_name', null: false
-    t.bigint 'byte_size', null: false
-    t.string 'checksum'
-    t.datetime 'created_at', null: false
-    t.index ['key'], name: 'index_active_storage_blobs_on_key', unique: true
-  end
-
-  create_table 'active_storage_variant_records', force: :cascade do |t|
-    t.bigint 'blob_id', null: false
-    t.string 'variation_digest', null: false
-    t.index %w[blob_id variation_digest], name: 'index_active_storage_variant_records_uniqueness', unique: true
-  end
-
-  create_table 'answers', force: :cascade do |t|
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.integer 'score'
-    t.bigint 'user_id'
-    t.bigint 'exam_id'
-    t.index ['exam_id'], name: 'index_answers_on_exam_id'
-    t.index ['user_id'], name: 'index_answers_on_user_id'
-  end
-
-  create_table 'branches', force: :cascade do |t|
-    t.string 'name'
-    t.text 'description'
-    t.integer 'health', default: 100
-    t.bigint 'tree_id', null: false
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.index ['tree_id'], name: 'index_branches_on_tree_id'
-  end
-
-  create_table 'categories', force: :cascade do |t|
-    t.string 'title'
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-  end
-
-  create_table 'exams', force: :cascade do |t|
-    t.string 'title'
-    t.integer 'difficulty', default: 0
-    t.integer 'version'
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.bigint 'category_id'
-    t.index ['category_id'], name: 'index_exams_on_category_id'
-    t.index ['id'], name: 'index_exams_on_id'
-  end
-
-  create_table 'exams_questions', id: false, force: :cascade do |t|
-    t.bigint 'exam_id'
-    t.bigint 'question_id'
-    t.index %w[exam_id question_id], name: 'index_exams_questions_on_exam_id_and_question_id', unique: true
-    t.index ['exam_id'], name: 'index_exams_questions_on_exam_id'
-    t.index ['question_id'], name: 'index_exams_questions_on_question_id'
-  end
-
-  create_table 'gardens', force: :cascade do |t|
-    t.string 'name'
-    t.bigint 'user_id', null: false
-    t.integer 'seeds', default: 0
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.integer 'nutrients', default: 0
-    t.index ['user_id'], name: 'index_gardens_on_user_id'
-  end
-
-  create_table 'options', force: :cascade do |t|
-    t.string 'text'
-    t.bigint 'question_id', null: false
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.boolean 'correct', default: false
-    t.index ['question_id'], name: 'index_options_on_question_id'
-  end
-
-  create_table 'questions', force: :cascade do |t|
-    t.string 'title'
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.bigint 'exam_id'
-    t.bigint 'revision_id'
-    t.boolean 'has_duo', default: false
-    t.daterange 'is_limited_between'
-    t.index ['exam_id'], name: 'index_questions_on_exam_id'
-    t.index ['id'], name: 'index_questions_on_id'
-    t.index ['revision_id'], name: 'index_questions_on_revision_id'
-  end
-
-  create_table 'revisions', force: :cascade do |t|
-    t.bigint 'exam_id', null: false
-    t.bigint 'user_id', null: false
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.integer 'interval_level', default: 0
-    t.index ['exam_id'], name: 'index_revisions_on_exam_id'
-    t.index ['user_id'], name: 'index_revisions_on_user_id'
-  end
-
-  create_table 'surprise_question_answers', force: :cascade do |t|
-    t.bigint 'question_id', null: false
-    t.bigint 'user_id', null: false
-    t.boolean 'winner', default: false
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.index ['question_id'], name: 'index_surprise_question_answers_on_question_id'
-    t.index ['user_id'], name: 'index_surprise_question_answers_on_user_id'
-  end
-
-  create_table 'trees', force: :cascade do |t|
-    t.string 'name'
-    t.integer 'phase', default: 0
-    t.integer 'health', default: 100
-    t.bigint 'garden_id', null: false
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.index ['garden_id'], name: 'index_trees_on_garden_id'
-  end
-
-  create_table 'users', force: :cascade do |t|
-    t.string 'username'
-    t.string 'email'
-    t.datetime 'created_at', null: false
-    t.datetime 'updated_at', null: false
-    t.string 'password_digest'
-    t.string 'name'
-  end
-
-  add_foreign_key 'active_storage_attachments', 'active_storage_blobs', column: 'blob_id'
-  add_foreign_key 'active_storage_variant_records', 'active_storage_blobs', column: 'blob_id'
-  add_foreign_key 'answers', 'exams'
-  add_foreign_key 'answers', 'users'
-  add_foreign_key 'branches', 'trees'
-  add_foreign_key 'exams', 'categories'
-  add_foreign_key 'exams_questions', 'exams'
-  add_foreign_key 'exams_questions', 'questions'
-  add_foreign_key 'gardens', 'users'
-  add_foreign_key 'options', 'questions'
-  add_foreign_key 'questions', 'exams'
-  add_foreign_key 'questions', 'revisions'
-  add_foreign_key 'revisions', 'exams'
-  add_foreign_key 'revisions', 'users'
-  add_foreign_key 'surprise_question_answers', 'questions'
-  add_foreign_key 'surprise_question_answers', 'users'
-  add_foreign_key 'trees', 'gardens'
+  enable_extension "plpgsql"
+
+  create_table "active_storage_attachments", force: :cascade do |t|
+    t.string "name", null: false
+    t.string "record_type", null: false
+    t.bigint "record_id", null: false
+    t.bigint "blob_id", null: false
+    t.datetime "created_at", null: false
+    t.index ["blob_id"], name: "index_active_storage_attachments_on_blob_id"
+    t.index ["record_type", "record_id", "name", "blob_id"], name: "index_active_storage_attachments_uniqueness", unique: true
+  end
+
+  create_table "active_storage_blobs", force: :cascade do |t|
+    t.string "key", null: false
+    t.string "filename", null: false
+    t.string "content_type"
+    t.text "metadata"
+    t.string "service_name", null: false
+    t.bigint "byte_size", null: false
+    t.string "checksum"
+    t.datetime "created_at", null: false
+    t.index ["key"], name: "index_active_storage_blobs_on_key", unique: true
+  end
+
+  create_table "active_storage_variant_records", force: :cascade do |t|
+    t.bigint "blob_id", null: false
+    t.string "variation_digest", null: false
+    t.index ["blob_id", "variation_digest"], name: "index_active_storage_variant_records_uniqueness", unique: true
+  end
+
+  create_table "answers", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer "score"
+    t.bigint "user_id"
+    t.bigint "exam_id"
+    t.index ["exam_id"], name: "index_answers_on_exam_id"
+    t.index ["user_id"], name: "index_answers_on_user_id"
+  end
+
+  create_table "branches", force: :cascade do |t|
+    t.string "name"
+    t.text "description"
+    t.integer "health", default: 100
+    t.bigint "tree_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["tree_id"], name: "index_branches_on_tree_id"
+  end
+
+  create_table "categories", force: :cascade do |t|
+    t.string "title"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
+  create_table "edges", force: :cascade do |t|
+    t.bigint "from_node_id", null: false
+    t.bigint "to_node_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["from_node_id", "to_node_id"], name: "index_edges_on_from_node_id_and_to_node_id", unique: true
+    t.index ["from_node_id"], name: "index_edges_on_from_node_id"
+    t.index ["to_node_id"], name: "index_edges_on_to_node_id"
+  end
+
+  create_table "exams", force: :cascade do |t|
+    t.string "title"
+    t.integer "difficulty", default: 0
+    t.integer "version"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.bigint "category_id"
+    t.index ["category_id"], name: "index_exams_on_category_id"
+    t.index ["id"], name: "index_exams_on_id"
+  end
+
+  create_table "exams_questions", id: false, force: :cascade do |t|
+    t.bigint "exam_id"
+    t.bigint "question_id"
+    t.index ["exam_id", "question_id"], name: "index_exams_questions_on_exam_id_and_question_id", unique: true
+    t.index ["exam_id"], name: "index_exams_questions_on_exam_id"
+    t.index ["question_id"], name: "index_exams_questions_on_question_id"
+  end
+
+  create_table "gardens", force: :cascade do |t|
+    t.string "name"
+    t.bigint "user_id", null: false
+    t.integer "seeds", default: 0
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer "nutrients", default: 0
+    t.index ["user_id"], name: "index_gardens_on_user_id"
+  end
+
+  create_table "mind_maps", force: :cascade do |t|
+    t.string "name"
+    t.bigint "category_id", null: false
+    t.bigint "user_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["category_id"], name: "index_mind_maps_on_category_id"
+    t.index ["user_id"], name: "index_mind_maps_on_user_id"
+  end
+
+  create_table "nodes", force: :cascade do |t|
+    t.string "nodeable_type", null: false
+    t.bigint "nodeable_id", null: false
+    t.integer "position"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer "graph_id"
+    t.index ["nodeable_type", "nodeable_id"], name: "index_nodes_on_nodeable"
+    t.index ["nodeable_type", "nodeable_id"], name: "index_nodes_on_nodeable_type_and_nodeable_id", unique: true
+  end
+
+  create_table "options", force: :cascade do |t|
+    t.string "text"
+    t.bigint "question_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.boolean "correct", default: false
+    t.index ["question_id"], name: "index_options_on_question_id"
+  end
+
+  create_table "questions", force: :cascade do |t|
+    t.string "title"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.bigint "exam_id"
+    t.bigint "revision_id"
+    t.boolean "has_duo", default: false
+    t.daterange "is_limited_between"
+    t.index ["exam_id"], name: "index_questions_on_exam_id"
+    t.index ["id"], name: "index_questions_on_id"
+    t.index ["revision_id"], name: "index_questions_on_revision_id"
+  end
+
+  create_table "revisions", force: :cascade do |t|
+    t.bigint "exam_id", null: false
+    t.bigint "user_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.integer "interval_level", default: 0
+    t.index ["exam_id"], name: "index_revisions_on_exam_id"
+    t.index ["user_id"], name: "index_revisions_on_user_id"
+  end
+
+  create_table "surprise_question_answers", force: :cascade do |t|
+    t.bigint "question_id", null: false
+    t.bigint "user_id", null: false
+    t.boolean "winner", default: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["question_id"], name: "index_surprise_question_answers_on_question_id"
+    t.index ["user_id"], name: "index_surprise_question_answers_on_user_id"
+  end
+
+  create_table "trees", force: :cascade do |t|
+    t.string "name"
+    t.integer "phase", default: 0
+    t.integer "health", default: 100
+    t.bigint "garden_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["garden_id"], name: "index_trees_on_garden_id"
+  end
+
+  create_table "users", force: :cascade do |t|
+    t.string "username"
+    t.string "email"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string "password_digest"
+    t.string "name"
+  end
+
+  add_foreign_key "active_storage_attachments", "active_storage_blobs", column: "blob_id"
+  add_foreign_key "active_storage_variant_records", "active_storage_blobs", column: "blob_id"
+  add_foreign_key "answers", "exams"
+  add_foreign_key "answers", "users"
+  add_foreign_key "branches", "trees"
+  add_foreign_key "edges", "nodes", column: "from_node_id"
+  add_foreign_key "edges", "nodes", column: "to_node_id"
+  add_foreign_key "exams", "categories"
+  add_foreign_key "exams_questions", "exams"
+  add_foreign_key "exams_questions", "questions"
+  add_foreign_key "gardens", "users"
+  add_foreign_key "mind_maps", "categories"
+  add_foreign_key "mind_maps", "users"
+  add_foreign_key "options", "questions"
+  add_foreign_key "questions", "exams"
+  add_foreign_key "questions", "revisions"
+  add_foreign_key "revisions", "exams"
+  add_foreign_key "revisions", "users"
+  add_foreign_key "surprise_question_answers", "questions"
+  add_foreign_key "surprise_question_answers", "users"
+  add_foreign_key "trees", "gardens"
 end
diff --git a/api/spec/factories/edges.rb b/api/spec/factories/edges.rb
new file mode 100644
index 0000000..bf80739
--- /dev/null
+++ b/api/spec/factories/edges.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :edge do
+  end
+end
diff --git a/api/spec/factories/mind_maps.rb b/api/spec/factories/mind_maps.rb
new file mode 100644
index 0000000..2f7f3d4
--- /dev/null
+++ b/api/spec/factories/mind_maps.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :mind_map do
+  end
+end
diff --git a/api/spec/factories/nodes.rb b/api/spec/factories/nodes.rb
new file mode 100644
index 0000000..3c313b4
--- /dev/null
+++ b/api/spec/factories/nodes.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :node do
+  end
+end
diff --git a/api/spec/models/edge_spec.rb b/api/spec/models/edge_spec.rb
new file mode 100644
index 0000000..9a2f680
--- /dev/null
+++ b/api/spec/models/edge_spec.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Edge, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/api/spec/models/mind_map_spec.rb b/api/spec/models/mind_map_spec.rb
new file mode 100644
index 0000000..a50a9c6
--- /dev/null
+++ b/api/spec/models/mind_map_spec.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe MindMap, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/api/spec/models/node_spec.rb b/api/spec/models/node_spec.rb
new file mode 100644
index 0000000..17827d1
--- /dev/null
+++ b/api/spec/models/node_spec.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Node, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end
diff --git a/api/spec/requests/mind_map_spec.rb b/api/spec/requests/mind_map_spec.rb
new file mode 100644
index 0000000..2e467f2
--- /dev/null
+++ b/api/spec/requests/mind_map_spec.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'MindMaps', type: :request do
+  describe 'GET /index' do
+    pending "add some examples (or delete) #{__FILE__}"
+  end
+end