Fix pending gas price in pending tx

CHANGELOG.md

@@ -9,6 +9,7 @@
 - [#7811](https://github.com/blockscout/blockscout/pull/7811) - Filter addresses before insertion
 
 ### Fixes
+- [#7872](https://github.com/blockscout/blockscout/pull/7872) - Fix pending gas price in pending tx
 - [#7825](https://github.com/blockscout/blockscout/pull/7825) - Fix nginx config for the new frontend websockets
 - [#7772](https://github.com/blockscout/blockscout/pull/7772) - Fix parsing of database password period(s)
 - [#7803](https://github.com/blockscout/blockscout/pull/7803) - Fix additional sources and interfaces, save names for vyper contracts

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transaction.ex

@@ -230,6 +230,7 @@ defmodule EthereumJSONRPC.Transaction do
       block_number: block_number,
       from_address_hash: from_address_hash,
       gas: gas,
+      gas_price: nil,
       hash: hash,
       index: index,
       input: input,

apps/explorer/lib/explorer/chain/transaction.ex

@@ -36,7 +36,7 @@ defmodule Explorer.Chain.Transaction do
   @optional_attrs ~w(max_priority_fee_per_gas max_fee_per_gas block_hash block_number created_contract_address_hash cumulative_gas_used earliest_processing_start
                      error gas_used index created_contract_code_indexed_at status to_address_hash revert_reason type has_error_in_internal_txs)a
 
-  @required_attrs ~w(from_address_hash gas gas_price hash input nonce r s v value)a
+  @required_attrs ~w(from_address_hash gas hash input nonce r s v value)a
 
   @typedoc """
   X coordinate module n in
@@ -154,7 +154,7 @@ defmodule Explorer.Chain.Transaction do
           from_address: %Ecto.Association.NotLoaded{} | Address.t(),
           from_address_hash: Hash.Address.t(),
           gas: Gas.t(),
-          gas_price: wei_per_gas,
+          gas_price: wei_per_gas | nil,
           gas_used: Gas.t() | nil,
           hash: Hash.t(),
           index: transaction_index | nil,
@@ -305,6 +305,25 @@ defmodule Explorer.Chain.Transaction do
       iex> changeset.valid?
       true
 
+  A pending transaction does not have a `gas_price` (Erigon)
+
+      iex> changeset = Explorer.Chain.Transaction.changeset(
+      ...>   %Transaction{},
+      ...>   %{
+      ...>     from_address_hash: "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>     gas: 4700000,
+      ...>     hash: "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+      ...>     input: "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",
+      ...>     nonce: 0,
+      ...>     r: 0xAD3733DF250C87556335FFE46C23E34DBAFFDE93097EF92F52C88632A40F0C75,
+      ...>     s: 0x72caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3,
+      ...>     v: 0x8d,
+      ...>     value: 0
+      ...>   }
+      ...> )
+      iex> changeset.valid?
+      true
+
   A collated transaction MUST have an `index` so its position in the `block` is known and the `cumulative_gas_used` ane
   `gas_used` to know its fees.