Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1121936
Description of problem:
I was trying to perform boundary test are created a install media with more than 255 characters and UI raises following error:

Error
PGError: ERROR: value too long for type character varying(255) : INSERT INTO "media" ("config_path", "created_at", "image_path", "media_path", "name", "os_family", "path", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING "id"

Version-Release number of selected component (if applicable):
sat6 GA snap1

How reproducible:
always

Steps to Reproduce:
1. create media with more than 255 characters of name
2.
3.

Actual results:
Error
PGError: ERROR: value too long for type character varying(255) : INSERT INTO "media" ("config_path", "created_at", "image_path", "media_path", "name", "os_family", "path", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING "id"

Expected results:
A proper validation error should be raised.

Additional info:
production.log:

Processing by MediaController#create as */*
Parameters: {"utf8"=>"✓", "search"=>"", "authenticity_token"=>"VX+UKFuIgqWyHwxAdhnLIrzFLAmDgGh5qENjFuLnsso=", "medium"=>{"name"=>"GlQTCDmDxesNUcEJdEXrqTPuIbBUmQwkejHGSrMbHsLGdhADopvRvwnLXHMReeAtIxlkRNpuKAkHGHMziLsnOndDMfemCoDgJewqSrwAXUTLAKeNnCeleDJeGBVnlmzBzZamfDmUBMjqJchefmIxCnJuHGoHilwrnMCRNZuMQnwyEguohCjIMznZRkGHrZXKmHikPGUblhRyBJxoZoadIiUKmlhoAxtzBZtjezFyrIsQSZvcYSjTuwGHwYjUCbM1", "path"=>"http://mirror.fakeos.org/vVcP/$major.$minor/os/$arch", "media_path"=>"", "config_path"=>"", "image_path"=>"", "os_family"=>"Redhat", "location_ids"=>[""], "organization_ids"=>[""]}}
Operation FAILED: PGError: ERROR: value too long for type character varying(255)
: INSERT INTO "media" ("config_path", "created_at", "image_path", "media_path", "name", "os_family", "path", "updated_at") VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING "id"
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