hotfix(explorer): panic on batches last page (#1731)

Author: avilagaston9

explorer/lib/explorer_web/components/batches_table.ex

@@ -38,7 +38,12 @@ defmodule ExplorerWeb.BatchesTable do
             <%= "N/A" %>
         <% end %>
         <.tooltip>
-          ~= <%= EthConverter.wei_to_eth(batch.fee_per_proof, 6) %> ETH
+          <%= case EthConverter.wei_to_eth(batch.fee_per_proof, 6) do %>
+            <% nil -> %>
+              <%= "N/A" %>
+            <% eth -> %>
+              <%= "~= #{eth} ETH" %>
+          <% end %>
         </.tooltip>
       </:col>
 

explorer/lib/explorer_web/live/eth_converter.ex

@@ -31,7 +31,11 @@ defmodule EthConverter do
     |> wei_to_eth(decimal_places)
   end
 
-  def wei_to_usd(wei, decimal_places \\ 0) do
+  def wei_to_usd(wei, decimal_places \\ 0)
+
+  def wei_to_usd(nil, _), do: {:error, "nil value"}
+
+  def wei_to_usd(wei, decimal_places) do
     with eth_amount <- wei_to_eth(wei, 18),
          {:ok, eth_price} <- get_eth_price_usd() do
       usd_value =
@@ -43,8 +47,11 @@ defmodule EthConverter do
     end
   end
 
+  def wei_to_usd_sf(wei, significant_figures \\ 3)
+  def wei_to_usd_sf(nil, _), do: {:error, "nil value"}
+
   # rounds to significant figures, instead of decimal places
-  def wei_to_usd_sf(wei, significant_figures \\ 3) do
+  def wei_to_usd_sf(wei, significant_figures) do
     with eth_amount <- wei_to_eth(wei, 18),
          {:ok, eth_price} <- get_eth_price_usd() do
       usd_value =

explorer/lib/explorer_web/live/pages/batch/index.html.heex

@@ -39,7 +39,7 @@
         </h3>
         <p><%= @current_batch.amount_of_proofs %></p>
       </div>
-      <div :if={@current_batch.fee_per_proof != 0} class="flex flex-col sm:flex-row">
+      <div :if={!is_nil(@current_batch.fee_per_proof)} class="flex flex-col sm:flex-row">
         <h3>
           Fee per Proof:
         </h3>