Add gem flipper-active_record to store flipper data

- Creates the migration for flipper: `flipper_features` and `flipper_gates`

Gemfile

@@ -114,6 +114,7 @@ gem 'ofn-qz', github: 'openfoodfoundation/ofn-qz', branch: 'ofn-rails-4'
 gem 'good_migrations'
 
 gem 'flipper'
+gem 'flipper-active_record'
 gem 'flipper-ui'
 
 group :production, :staging do

Gemfile.lock

@@ -234,6 +234,9 @@ GEM
     figaro (1.2.0)
       thor (>= 0.14.0, < 2)
     flipper (0.20.4)
+    flipper-active_record (0.20.4)
+      activerecord (>= 5.0, < 7)
+      flipper (~> 0.20.4)
     flipper-ui (0.20.4)
       erubi (>= 1.0.0, < 2.0.0)
       flipper (~> 0.20.4)
@@ -649,6 +652,7 @@ DEPENDENCIES
   ffaker
   figaro
   flipper
+  flipper-active_record
   flipper-ui
   fog-aws (>= 0.6.0)
   foundation-icons-sass-rails

db/migrate/20210326094519_create_flipper_tables.rb

@@ -0,0 +1,22 @@
+class CreateFlipperTables < ActiveRecord::Migration[5.0]
+  def self.up
+    create_table :flipper_features do |t|
+      t.string :key, null: false
+      t.timestamps null: false
+    end
+    add_index :flipper_features, :key, unique: true
+
+    create_table :flipper_gates do |t|
+      t.string :feature_key, null: false
+      t.string :key, null: false
+      t.string :value
+      t.timestamps null: false
+    end
+    add_index :flipper_gates, [:feature_key, :key, :value], unique: true
+  end
+
+  def self.down
+    drop_table :flipper_gates
+    drop_table :flipper_features
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20210407170804) do
+ActiveRecord::Schema.define(version: 20210326094519) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -250,6 +250,22 @@ ActiveRecord::Schema.define(version: 20210407170804) do
     t.index ["sender_id"], name: "index_exchanges_on_sender_id", using: :btree
   end
 
+  create_table "flipper_features", force: :cascade do |t|
+    t.string   "key",        null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["key"], name: "index_flipper_features_on_key", unique: true, using: :btree
+  end
+
+  create_table "flipper_gates", force: :cascade do |t|
+    t.string   "feature_key", null: false
+    t.string   "key",         null: false
+    t.string   "value"
+    t.datetime "created_at",  null: false
+    t.datetime "updated_at",  null: false
+    t.index ["feature_key", "key", "value"], name: "index_flipper_gates_on_feature_key_and_key_and_value", unique: true, using: :btree
+  end
+
   create_table "inventory_items", force: :cascade do |t|
     t.integer  "enterprise_id",                null: false
     t.integer  "variant_id",                   null: false
@@ -769,15 +785,15 @@ ActiveRecord::Schema.define(version: 20210407170804) do
   end
 
   create_table "spree_shipments", force: :cascade do |t|
-    t.string   "tracking",             limit: 255
-    t.string   "number",               limit: 255
-    t.decimal  "cost",                             precision: 10, scale: 2, default: "0.0", null: false
+    t.string   "tracking",          limit: 255
+    t.string   "number",            limit: 255
+    t.decimal  "cost",                          precision: 10, scale: 2, default: "0.0", null: false
     t.datetime "shipped_at"
     t.integer  "order_id"
     t.integer  "address_id"
-    t.datetime "created_at",                                                                null: false
-    t.datetime "updated_at",                                                                null: false
-    t.string   "state",                limit: 255
+    t.datetime "created_at",                                                             null: false
+    t.datetime "updated_at",                                                             null: false
+    t.string   "state",             limit: 255
     t.integer  "stock_location_id"
     t.decimal  "included_tax_total",               precision: 10, scale: 2, default: "0.0", null: false
     t.decimal  "additional_tax_total",             precision: 10, scale: 2, default: "0.0", null: false