Make the mysql schema dumper roundtrip the limits of text/blob columns. Closes #7424 [will.bryant]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8969 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 17 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
index c37bfd3e81..6432c3cfee 100755
--- a/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
@@ -112,6 +112,23 @@ module ActiveRecord
           super
         end
 
+        def extract_limit(sql_type)
+          if sql_type =~ /blob|text/i
+            case sql_type
+            when /tiny/i
+              255
+            when /medium/i
+              16777215
+            when /long/i
+              2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases
+            else
+              super # we could return 65535 here, but we leave it undecorated by default
+            end
+          else
+            super
+          end
+        end
+
         # MySQL misreports NOT NULL column default when none is given.
         # We can't detect this for columns which may have a legitimate ''
         # default (string) but we can for others (integer, datetime, boolean,