custom block explorer isar model/schema

lib/db/isar/main_db.dart

@@ -2,6 +2,7 @@ import 'package:decimal/decimal.dart';
 import 'package:flutter_native_splash/cli_commands.dart';
 import 'package:isar/isar.dart';
 import 'package:stackwallet/exceptions/main_db/main_db_exception.dart';
+import 'package:stackwallet/models/isar/models/block_explorer.dart';
 import 'package:stackwallet/models/isar/models/isar_models.dart';
 import 'package:stackwallet/utilities/amount/amount.dart';
 import 'package:stackwallet/utilities/enums/coin_enum.dart';
@@ -33,6 +34,7 @@ class MainDB {
         AddressSchema,
         AddressLabelSchema,
         EthContractSchema,
+        TransactionBlockExplorerSchema,
       ],
       directory: (await StackFileSystem.applicationIsarDirectory()).path,
       // inspector: kDebugMode,
@@ -43,6 +45,25 @@ class MainDB {
     return true;
   }
 
+  // tx block explorers
+  TransactionBlockExplorer? getTransactionBlockExplorer({required Coin coin}) {
+    return isar.transactionBlockExplorers
+        .where()
+        .tickerEqualTo(coin.ticker)
+        .findFirstSync();
+  }
+
+  Future<int> putTransactionBlockExplorer(
+      TransactionBlockExplorer explorer) async {
+    try {
+      return await isar.writeTxn(() async {
+        return await isar.transactionBlockExplorers.put(explorer);
+      });
+    } catch (e) {
+      throw MainDBException("failed putTransactionBlockExplorer: $explorer", e);
+    }
+  }
+
   // addresses
   QueryBuilder<Address, Address, QAfterWhereClause> getAddresses(
           String walletId) =>

lib/models/isar/models/block_explorer.dart

@@ -0,0 +1,35 @@
+import 'package:isar/isar.dart';
+import 'package:stackwallet/utilities/enums/coin_enum.dart';
+
+part 'block_explorer.g.dart';
+
+@collection
+class TransactionBlockExplorer {
+  TransactionBlockExplorer({
+    required this.ticker,
+    required this.url,
+  });
+
+  Id id = Isar.autoIncrement;
+
+  @Index(unique: true, replace: true)
+  late final String ticker;
+
+  late final String url;
+
+  @ignore
+  Coin? get coin {
+    try {
+      return coinFromTickerCaseInsensitive(ticker);
+    } catch (_) {
+      return null;
+    }
+  }
+
+  Uri? getUrlFor({required String txid}) => Uri.tryParse(
+        url.replaceFirst(
+          "%5BTXID%5D",
+          txid,
+        ),
+      );
+}