CheckIfDonorIsMemberService.rb

class CheckIfDonorIsMemberService
  def call

    if Membership.find_by(email: @email)
      @current_user = Membership.find_by(email: @email)
    else
      false
    end

  end

  private

  def initialize(params)
    @email = params[:email]
  end

end

create.haml

  def create
    amount = CorrectMoneyService.new(params).call

    if donor = CheckIfDonorIsMemberService.new(params).call
      binding.pry
      FindStripeId.new(@current_user, params).call
    else
      stripe = CreateStripeCustomerService.new(params).call
      @current_user = Membership.create(name: params[:name], password: '  ', email: params[:email], role: 'donor', stripe_id: stripe.id)
      session[:user_id] = @current_user.id
      cookies[:temp_password] = @temp_password
    end

    donation_type = CheckChargeType.new(@current_user,params, amount).call
    flash[:notice] = 'Thank you so much for your donation.'
    redirect_to membership_path(@current_user)
  rescue Stripe::CardError => e
    flash[:error] = e.message
    redirect_to new_donation_path
  end