Created attachment 918973 [details]
PgError when parameter name/value exceeds 255 characters

Description of problem:
I was trying create OS paraemeter and specified name and value with more than 255 char and UI raised following error:

Error
PGError: ERROR: value too long for type character varying(255) : UPDATE "parameters" SET "name" = 'ojJELjrEfavaKHSkSDTncoiqjwik12345yyteyNSBmqcshsFlNcAsGExwayeTXjFOQmXTuVNWCotNUBMbiJmDKtsPtLnXqYJSjTUyNIlSNAAucqVkKXGFrViwyGLTRnqqBaLuGskexxWkYHTLHdLFMEXTmRLiGZgvkTGGmqGEKpGwzEOerEAbVJWBLaKytzydTwJcIQOUdBxowqKqIUSJKZkYHwUzkPWGjQMkpdpadzBctjvjBMDmpfPYurKybcvvvvvz', "updated_at" = '2014-07-18 00:30:56.747600' WHERE "parameters"."type" IN ('OsParameter') AND "parameters"."id" = 5

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

How reproducible:
always

Steps to Reproduce:
1. create OS and then add a parameter with name/value above 255 chars
2.
3.

Actual results:

Error
PGError: ERROR: value too long for type character varying(255) : UPDATE "parameters" SET "name" = 'ojJELjrEfavaKHSkSDTncoiqjwik12345yyteyNSBmqcshsFlNcAsGExwayeTXjFOQmXTuVNWCotNU

Expected results:
UI should throw proper error message like:
Validation failed: Parameter name/value can not be more than 25 char

Additional info:
production.log says:

Processing by OperatingsystemsController#update as */*
  Parameters: {"utf8"=>"✓", "search"=>"", "authenticity_token"=>"LhwFPtqqR+6kC/oHyhdO70e1e2faExia/6RqRiFMgDU=", "operatingsystem"=>{"name"=>"RedHat", "major"=>"6", "minor"=>"5", "description"=>"", "family"=>"Redhat", "release_name"=>"", "architecture_ids"=>["", ""], "ptable_ids"=>[""], "medium_ids"=>["", ""], "os_parameters_attributes"=>{"0"=>{"name"=>"ojJELjrEfavaKHSkSDTncoiqjwik12345yyteyNSBmqcshsFlNcAsGExwayeTXjFOQmXTuVNWCotNUBMbiJmDKtsPtLnXqYJSjTUyNIlSNAAucqVkKXGFrViwyGLTRnqqBaLuGskexxWkYHTLHdLFMEXTmRLiGZgvkTGGmqGEKpGwzEOerEAbVJWBLaKytzydTwJcIQOUdBxowqKqIUSJKZkYHwUzkPWGjQMkpdpadzBctjvjBMDmpfPYurKybcvvvvvz", "value"=>"[FILTERED]", "_destroy"=>"false", "nested"=>"", "id"=>"5"}}}, "id"=>"4"}
Operation FAILED: PGError: ERROR:  value too long for type character varying(255)
: UPDATE "parameters" SET "name" = 'ojJELjrEfavaKHSkSDTncoiqjwik12345yyteyNSBmqcshsFlNcAsGExwayeTXjFOQmXTuVNWCotNUBMbiJmDKtsPtLnXqYJSjTUyNIlSNAAucqVkKXGFrViwyGLTRnqqBaLuGskexxWkYHTLHdLFMEXTmRLiGZgvkTGGmqGEKpGwzEOerEAbVJWBLaKytzydTwJcIQOUdBxowqKqIUSJKZkYHwUzkPWGjQMkpdpadzBctjvjBMDmpfPYurKybcvvvvvz', "updated_at" = '2014-07-18 00:30:56.747600' WHERE "parameters"."type" IN ('OsParameter') AND "parameters"."id" = 5
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