Move categories to top-level namespace (#894)

app/controllers/categories_controller.rb

@@ -0,0 +1,47 @@
+class CategoriesController < ApplicationController
+  layout "with_sidebar"
+
+  before_action :set_category, only: %i[ edit update ]
+  before_action :set_transaction, only: :create
+
+  def index
+    @categories = Current.family.categories.alphabetically
+  end
+
+  def new
+    @category = Current.family.categories.new color: Category::COLORS.sample
+  end
+
+  def create
+    Category.transaction do
+      category = Current.family.categories.create!(category_params)
+      @transaction.update!(category_id: category.id) if @transaction
+    end
+
+    redirect_back_or_to transactions_path, notice: t(".success")
+  end
+
+  def edit
+  end
+
+  def update
+    @category.update! category_params
+
+    redirect_back_or_to transactions_path, notice: t(".success")
+  end
+
+  private
+    def set_category
+      @category = Current.family.categories.find(params[:id])
+    end
+
+    def set_transaction
+      if params[:transaction_id].present?
+        @transaction = Current.family.transactions.find(params[:transaction_id])
+      end
+    end
+
+    def category_params
+      params.require(:category).permit(:name, :color)
+    end
+end