New bank addition (mostly hashing out STI bits)

Messy and gross. Will get cleaned up in the next couple of commits.

app/controllers/accounts_controller.rb

@@ -1,10 +1,40 @@
 class AccountsController < ApplicationController
+  before_action :authenticate_user!
+
   def index
+    @accounts = current_family.accounts
   end
 
   def new
   end
 
+  def new_bank
+    @account = DepositoryAccount.new
+  end
+
   def show
   end
+
+  def create
+    @account = account_type_class.new(account_params)
+    @account.family = current_family
+
+    if @account.save
+      redirect_to accounts_path
+    else
+      render :new
+    end
+  end
+
+  private
+
+  def account_params
+    params.require(:account).permit(:name, :balance, :type, :subtype)
+  end
+
+  def account_type_class
+    params[:type].constantize
+  rescue
+    Account # Default to Account if type is not provided or invalid
+  end
 end

app/controllers/application_controller.rb

@@ -13,6 +13,11 @@ class ApplicationController < ActionController::Base
   end
   helper_method :current_user
 
+  def current_family
+    current_user.family
+  end
+  helper_method :current_family
+
   def authenticate_user_from_session
     User.find_by(id: session[:user_id])
   end