Address review comments

apps/explorer/lib/explorer/chain/import/runner/blocks.ex

@@ -573,12 +573,10 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     initial = from(t in Transaction, where: false)
 
     Enum.reduce(blocks_changes, initial, fn %{consensus: consensus, hash: hash, number: number}, acc ->
-      case consensus do
+      if consensus do
-        false ->
-          from(transaction in acc, or_where: transaction.block_hash == ^hash and transaction.block_number == ^number)
-
-        true ->
         from(transaction in acc, or_where: transaction.block_hash != ^hash and transaction.block_number == ^number)
+      else
+        from(transaction in acc, or_where: transaction.block_hash == ^hash and transaction.block_number == ^number)
       end
     end)
   end
@@ -587,12 +585,10 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     initial = from(b in Block, where: false)
 
     Enum.reduce(blocks_changes, initial, fn %{consensus: consensus, parent_hash: parent_hash, number: number}, acc ->
-      case consensus do
+      if consensus do
-        false ->
-          acc
-
-        true ->
         from(block in acc, or_where: block.number == ^(number - 1) and block.hash != ^parent_hash)
+      else
+        acc
       end
     end)
   end

apps/explorer/priv/repo/migrations/scripts/20190326202921_lose_consensus_for_invalid_blocks.sql

@@ -1,5 +1,5 @@
-UPDATE blocks SET consensus = FALSE
+UPDATE blocks SET consensus = FALSE, updated_at = NOW()
-WHERE number IN (
+WHERE consensus AND number IN (
   SELECT b0.number - 1 FROM "blocks" AS b0
   LEFT JOIN "blocks" AS b1 ON (b0."parent_hash" = b1."hash") AND b1."consensus"
   WHERE b0."number" > 0 AND b0."consensus" AND b1."hash" IS NULL