better variable initialization in beer controller

app/controllers/beers_controller.rb

@@ -1,5 +1,6 @@
 class BeersController < ApplicationController
   before_action :set_beer, only: %i[show edit update destroy]
+  before_action :set_breweries_and_styles_for_template, only: [:new, :edit, :create]
 
   # GET /beers or /beers.json
   def index
@@ -13,8 +14,6 @@ class BeersController < ApplicationController
   # GET /beers/new
   def new
     @beer = Beer.new
-    @breweries = Brewery.all
-    @styles = ["Weizen", "Lager", "Pale ale", "IPA", "Porter", "Lowalcohol"]
   end
 
   # GET /beers/1/edit
@@ -32,7 +31,6 @@ class BeersController < ApplicationController
         format.html { redirect_to beers_path, notice: "Beer was successfully created." }
         format.json { render :show, status: :created, location: @beer }
       else
-        @breweries = Brewery.all
         format.html { render :new, status: :unprocessable_entity }
         format.json { render json: @beer.errors, status: :unprocessable_entity }
       end
@@ -73,4 +71,9 @@ class BeersController < ApplicationController
   def beer_params
     params.require(:beer).permit(:name, :style, :brewery_id)
   end
+
+  def set_breweries_and_styles_for_template
+    @breweries = Brewery.all
+    @styles = ["Weizen", "Lager", "Pale ale", "IPA", "Porter", "Lowalcohol"]
+  end
 end