Create SettingEntry model

app/models/setting_entry.rb

@@ -0,0 +1,52 @@
+class SettingEntry < ApplicationRecord
+  validates :code, presence: true, uniqueness: true
+  validates :value, presence: true
+  validates :format, presence: true
+  validate :valid_value_format
+
+  VALUE_FORMATS = {
+    string: :string_format,
+    integer: :integer_format,
+    boolean: :boolean_format,
+    hash: :hash_format,
+    array: :array_format,
+  }.with_indifferent_access.freeze
+
+  def valid_value_format
+    formats = VALUE_FORMATS.with_indifferent_access
+    errors.add(:format, :invalid) unless formats.keys.any? format
+  end
+
+  def string_format
+    value
+  end
+
+  def integer_format
+    value.to_i
+  end
+
+  def boolean_format
+    value == 'true'
+  end
+
+  def hash_format
+    JSON.parse(value)
+  end
+
+  def array_format
+    JSON.parse(value).to_a
+  end
+
+  def retrieve
+    method = VALUE_FORMATS[format]
+    send(method)
+  end
+
+  def self.method_missing(method, *args)
+    super(method, *args)
+  rescue NoMethodError
+    raise NoMethodError if method.to_s.include? '='
+
+    SettingEntry.find_by!(code: method.to_s).retrieve
+  end
+end

db/migrate/20200811074839_create_setting_entries.rb

@@ -0,0 +1,16 @@
+class CreateSettingEntries < ActiveRecord::Migration[6.0]
+  def change
+    create_table :setting_entries do |t|
+      t.string :code, null: false, index: { unique: true }
+      t.string :value, null: false
+      t.string :group, null: false
+      t.string :format, null: false
+
+      # Versioning related
+      t.string :creator_str
+      t.string :updator_str
+
+      t.timestamps
+    end
+  end
+end

db/structure.sql

@@ -31,6 +31,14 @@ COMMENT ON EXTENSION plpgsql IS 'PL/pgSQL procedural language';
 
 CREATE EXTENSION IF NOT EXISTS btree_gist WITH SCHEMA public;
 
+
+--
+-- Name: EXTENSION btree_gist; Type: COMMENT; Schema: -; Owner: -
+--
+
+COMMENT ON EXTENSION btree_gist IS 'support for indexing common datatypes in GiST';
+
+
 --
 -- Name: citext; Type: EXTENSION; Schema: -; Owner: -
 --
@@ -2254,6 +2262,42 @@ CREATE TABLE public.schema_migrations (
 );
 
 
+--
+-- Name: setting_entries; Type: TABLE; Schema: public; Owner: -; Tablespace:
+--
+
+CREATE TABLE public.setting_entries (
+    id bigint NOT NULL,
+    code character varying NOT NULL,
+    value character varying NOT NULL,
+    "group" character varying NOT NULL,
+    format character varying NOT NULL,
+    creator_str character varying,
+    updator_str character varying,
+    created_at timestamp(6) without time zone NOT NULL,
+    updated_at timestamp(6) without time zone NOT NULL
+);
+
+
+--
+-- Name: setting_entries_id_seq; Type: SEQUENCE; Schema: public; Owner: -
+--
+
+CREATE SEQUENCE public.setting_entries_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+
+--
+-- Name: setting_entries_id_seq; Type: SEQUENCE OWNED BY; Schema: public; Owner: -
+--
+
+ALTER SEQUENCE public.setting_entries_id_seq OWNED BY public.setting_entries.id;
+
+
 --
 -- Name: settings; Type: TABLE; Schema: public; Owner: -; Tablespace:
 --
@@ -2855,6 +2899,13 @@ ALTER TABLE ONLY public.registrars ALTER COLUMN id SET DEFAULT nextval('public.r
 ALTER TABLE ONLY public.reserved_domains ALTER COLUMN id SET DEFAULT nextval('public.reserved_domains_id_seq'::regclass);
 
 
+--
+-- Name: id; Type: DEFAULT; Schema: public; Owner: -
+--
+
+ALTER TABLE ONLY public.setting_entries ALTER COLUMN id SET DEFAULT nextval('public.setting_entries_id_seq'::regclass);
+
+
 --
 -- Name: id; Type: DEFAULT; Schema: public; Owner: -
 --
@@ -3321,6 +3372,14 @@ ALTER TABLE ONLY public.reserved_domains
     ADD CONSTRAINT reserved_domains_pkey PRIMARY KEY (id);
 
 
+--
+-- Name: setting_entries_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace:
+--
+
+ALTER TABLE ONLY public.setting_entries
+    ADD CONSTRAINT setting_entries_pkey PRIMARY KEY (id);
+
+
 --
 -- Name: settings_pkey; Type: CONSTRAINT; Schema: public; Owner: -; Tablespace:
 --
@@ -3993,6 +4052,13 @@ CREATE INDEX index_registrant_verifications_on_created_at ON public.registrant_v
 CREATE INDEX index_registrant_verifications_on_domain_id ON public.registrant_verifications USING btree (domain_id);
 
 
+--
+-- Name: index_setting_entries_on_code; Type: INDEX; Schema: public; Owner: -; Tablespace:
+--
+
+CREATE UNIQUE INDEX index_setting_entries_on_code ON public.setting_entries USING btree (code);
+
+
 --
 -- Name: index_settings_on_thing_type_and_thing_id_and_var; Type: INDEX; Schema: public; Owner: -; Tablespace:
 --
@@ -4712,6 +4778,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20200610090110'),
 ('20200630081231'),
 ('20200714115338'),
-('20200807110611');
+('20200807110611'),
+('20200811074839');