<%= link_to checking_decreasing_user_notifications_path(
      current_user,
      notifiable_type: notification.notifiable_type,
      notifiable_id: notification.notifiable_id,
      notification_action: notification.action
     ) do %>

def checking_decreasing
  current_user.decreasing_comment_notification_number(
    params[:notifiable_type],
    params[:notifiable_id]
  )
  redirect_to notification_redirection_path(
    params[:notifiable_type],
    params[:notifiable_id],
    params[:notification_action]
  )
end

def notification_redirection_path(notifiable_type, notifiable_id, action)
  if action == "commented"
    if notifiable_type == "ProductCustomer"
      product_customer = ProductCustomer.find(notifiable_id)
      product_id = product_customer.product_id
    elsif notifiable_type == "ProductLead"
      product_lead = ProductLead.find(notifiable_id)
      product_id = product_lead.product_id
    end
    route = case notifiable_type
            when "Post"
              posts_path(anchor: "post_#{notifiable_id}")#{}"/posts#post_#{notifiable_id}"
            when "Product"
              product_path(notifiable_id, anchor: "comment-panel")#/products/#{notifiable_id}#comment-panel"
            when "ProductLead"
              product_product_lead_path(product_id, notifiable_id, anchor: "comment-panel")#{}"/products/#{product_id}/#{notifiable_type}/#{notifiable_id}#comment-panel"
            when "ProductCustomer"
              product_product_customer_path(product_id, notifiable_id, anchor: "comment-panel") #/products/#{product_id}/#{notifiable_type}/#{notifiable_id}#comment-panel"
            end
  elsif action == "invited"
    product_path(notifiable_id, anchor: "product-invitation-well")
  elsif action == "accepted"
    product_product_users_path(notifiable_id)
  end
end