Allow changing text and blob size without giving the `limit` option

In MySQL, the text column size is 65,535 bytes by default (1 GiB in
PostgreSQL). It is sometimes too short when people want to use a text
column, so they sometimes change the text size to mediumtext (16 MiB) or
longtext (4 GiB) by giving the `limit` option.

Unlike MySQL, PostgreSQL doesn't allow the `limit` option for a text
column (raises ERROR: type modifier is not allowed for type "text").
So `limit: 4294967295` (longtext) couldn't be used in Action Text.

I've allowed changing text and blob size without giving the `limit`
option, it prevents that migration failure on PostgreSQL.

1 files changed, 3 insertions, 2 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 415a0576c4..7b69a63f6e 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -29,7 +29,7 @@ module ActiveRecord
       NATIVE_DATABASE_TYPES = {
         primary_key: "bigint auto_increment PRIMARY KEY",
         string:      { name: "varchar", limit: 255 },
-        text:        { name: "text", limit: 65535 },
+        text:        { name: "text" },
         integer:     { name: "int", limit: 4 },
         float:       { name: "float", limit: 24 },
         decimal:     { name: "decimal" },
@@ -37,7 +37,8 @@ module ActiveRecord
         timestamp:   { name: "timestamp" },
         time:        { name: "time" },
         date:        { name: "date" },
-        binary:      { name: "blob", limit: 65535 },
+        binary:      { name: "blob" },
+        blob:        { name: "blob" },
         boolean:     { name: "tinyint", limit: 1 },
         json:        { name: "json" },
       }