Add model OrgUnit

app/models/org_unit.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class OrgUnit < ApplicationRecord
+  ################
+  # Associations #
+  ################
+
+  belongs_to :kind,
+             class_name: 'OrgUnitKind',
+             inverse_of: :instances
+
+  belongs_to :parent,
+             class_name: 'OrgUnit',
+             inverse_of: :children,
+             optional: true
+
+  has_many :children,
+           class_name: 'OrgUnit',
+           inverse_of: :parent,
+           foreign_key: :parent_id
+
+  ###############
+  # Validations #
+  ###############
+
+  validates :name, good_small_text: true, uniqueness: true
+
+  validates :parent,
+            presence: {
+              if: ->(record) { record.kind&.parent_kind },
+              message: :required,
+            }
+end

app/models/org_unit_kind.rb

@@ -15,6 +15,11 @@ class OrgUnitKind < ApplicationRecord
            inverse_of: :parent_kind,
            foreign_key: :parent_kind_id
 
+  has_many :instances,
+           class_name: 'OrgUnit',
+           inverse_of: :kind,
+           foreign_key: :kind_id
+
   ###############
   # Validations #
   ###############

db/migrate/20190930215223_create_org_units.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class CreateOrgUnits < ActiveRecord::Migration[6.0]
+  include Partynest::Migration
+
+  def change
+    create_table :org_units do |t|
+      t.timestamps null: false
+
+      t.string :name, null: false, index: { unique: true }
+
+      t.references :kind,
+                   null: false,
+                   index: true,
+                   foreign_key: { to_table: :org_unit_kinds }
+
+      t.references :parent,
+                   null: true,
+                   index: true,
+                   foreign_key: { to_table: :org_units }
+    end
+
+    add_constraint :org_units, :name, <<~SQL
+      is_good_small_text(name)
+    SQL
+  end
+end

db/structure.sql

@@ -498,6 +498,40 @@ CREATE SEQUENCE public.org_unit_kinds_id_seq
 ALTER SEQUENCE public.org_unit_kinds_id_seq OWNED BY public.org_unit_kinds.id;
 
 
+--
+-- Name: org_units; Type: TABLE; Schema: public; Owner: -
+--
+
+CREATE TABLE public.org_units (
+    id bigint NOT NULL,
+    created_at timestamp(6) without time zone NOT NULL,
+    updated_at timestamp(6) without time zone NOT NULL,
+    name character varying NOT NULL,
+    kind_id bigint NOT NULL,
+    parent_id bigint,
+    CONSTRAINT name CHECK (public.is_good_small_text((name)::text))
+);
+
+
+--
+-- Name: org_units_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE public.org_units_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: org_units_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE public.org_units_id_seq OWNED BY public.org_units.id;
+
+
 --
 -- Name: passports; Type: TABLE; Schema: public; Owner: -
 --
@@ -928,6 +962,13 @@ ALTER TABLE ONLY public.federal_subjects ALTER COLUMN id SET DEFAULT nextval('pu
 ALTER TABLE ONLY public.org_unit_kinds ALTER COLUMN id SET DEFAULT nextval('public.org_unit_kinds_id_seq'::regclass);
 
 
+--
+-- Name: org_units id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.org_units ALTER COLUMN id SET DEFAULT nextval('public.org_units_id_seq'::regclass);
+
+
 --
 -- Name: passports id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -1063,6 +1104,14 @@ ALTER TABLE ONLY public.org_unit_kinds
     ADD CONSTRAINT org_unit_kinds_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: org_units org_units_pkey; Type: CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.org_units
+    ADD CONSTRAINT org_units_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: passports passports_pkey; Type: CONSTRAINT; Schema: public; Owner: -
 --
@@ -1276,6 +1325,27 @@ CREATE INDEX index_org_unit_kinds_on_parent_kind_id ON public.org_unit_kinds USI
 CREATE UNIQUE INDEX index_org_unit_kinds_on_short_name ON public.org_unit_kinds USING btree (short_name);
 
 
+--
+-- Name: index_org_units_on_kind_id; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX index_org_units_on_kind_id ON public.org_units USING btree (kind_id);
+
+
+--
+-- Name: index_org_units_on_name; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE UNIQUE INDEX index_org_units_on_name ON public.org_units USING btree (name);
+
+
+--
+-- Name: index_org_units_on_parent_id; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX index_org_units_on_parent_id ON public.org_units USING btree (parent_id);
+
+
 --
 -- Name: index_passports_on_federal_subject_id; Type: INDEX; Schema: public; Owner: -
 --
@@ -1459,6 +1529,14 @@ ALTER TABLE ONLY public.people
     ADD CONSTRAINT fk_rails_4f02f930eb FOREIGN KEY (contact_list_id) REFERENCES public.contact_lists(id);
 
 
+--
+-- Name: org_units fk_rails_54c0512b74; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.org_units
+    ADD CONSTRAINT fk_rails_54c0512b74 FOREIGN KEY (parent_id) REFERENCES public.org_units(id);
+
+
 --
 -- Name: sessions fk_rails_5599381559; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -1547,6 +1625,14 @@ ALTER TABLE ONLY public.relation_transitions
     ADD CONSTRAINT fk_rails_b61956945e FOREIGN KEY (from_status_id) REFERENCES public.relation_statuses(id);
 
 
+--
+-- Name: org_units fk_rails_ccc56f184e; Type: FK CONSTRAINT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.org_units
+    ADD CONSTRAINT fk_rails_ccc56f184e FOREIGN KEY (kind_id) REFERENCES public.org_unit_kinds(id);
+
+
 --
 -- Name: passports fk_rails_cd632a506c; Type: FK CONSTRAINT; Schema: public; Owner: -
 --
@@ -1604,6 +1690,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20190929131544'),
 ('20190930154031'),
 ('20190930205337'),
-('20190930210852');
+('20190930210852'),
+('20190930215223');
 
 

factories/org_units.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :some_root_org_unit, class: OrgUnit do
+    name { Faker::Company.unique.name }
+
+    association :kind, factory: :some_root_org_unit_kind
+
+    trait :with_parent do
+      association :kind, factory: :some_children_org_unit_kind
+
+      parent { create :some_root_org_unit, kind: kind.parent_kind }
+    end
+  end
+
+  factory :some_children_org_unit,
+          parent: :some_root_org_unit,
+          traits: %i[with_parent]
+end

spec/models/org_unit_kind_spec.rb

@@ -34,6 +34,17 @@ RSpec.describe OrgUnitKind do
     end
   end
 
+  describe '#instance' do
+    it do
+      is_expected.to \
+        have_many(:instances)
+        .class_name('OrgUnit')
+        .inverse_of(:kind)
+        .with_foreign_key(:kind_id)
+        .dependent(:restrict_with_exception)
+    end
+  end
+
   describe '#codename' do
     def allow_value(*)
       super.for :codename

spec/models/org_unit_spec.rb

@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe OrgUnit do
+  subject { create :some_children_org_unit }
+
+  describe '#kind' do
+    it do
+      is_expected.to \
+        belong_to(:kind)
+        .class_name('OrgUnitKind')
+        .inverse_of(:instances)
+        .required
+    end
+
+    it { is_expected.to validate_presence_of(:kind).with_message(:required) }
+  end
+
+  describe '#parent' do
+    it do
+      is_expected.to \
+        belong_to(:parent)
+        .class_name('OrgUnit')
+        .inverse_of(:children)
+    end
+
+    context 'when organizational unit type does not require parent' do
+      subject { create :some_root_org_unit }
+
+      it do
+        is_expected.not_to validate_presence_of(:parent).with_message(:required)
+      end
+    end
+
+    context 'when organizational unit type does not require parent' do
+      subject { create :some_children_org_unit }
+
+      it do
+        is_expected.to validate_presence_of(:parent).with_message(:required)
+      end
+    end
+  end
+end