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Editorial Team
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Asked: 2026-06-01T23:14:18+00:00

I’m trying to create a model with a Binary field in Datamapper for Rails

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I’m trying to create a model with a Binary field in Datamapper for Rails 3 that looks like so:

class Image

  include DataMapper::Resource

  # attributes
  property :id, Serial
  property :url, String
  property :file_name, String
  property :content_type, String
  property :data, Binary
  property :created_at, DateTime
  property :updated_at, DateTime

end

However, when I try to migrate I get the following: 

ERROR:  type modifier is not allowed for type "bytea"
LINE 1: ..." VARCHAR(50), "content_type" VARCHAR(50), "data" BYTEA(50),...

I can’t seem to find a way to remove the limit of 50 that datamapper is placing upon the field. Anybody know how to do this or fix the problem?

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1 Answer

  1. Editorial Team

    This is a bug in DataMapper. Check out this thread. It has already been fixed in GitHub, but it hasn’t made it to a release yet. If you’re ok with it, it’s very easy to patch dm-migrations to fix it. In “dm-migrations/adapters/dm-do-adapter.rb”, you find the line that says

    if dump_class.equal?(String) && schema_primitive != 'TEXT' && schema_primitive != 'CLOB' && schema_primitive != 'NVARCHAR'

    and append

    && schema_primitive != 'BYTEA'

    to the end of it.

    I tested your code here and it works with the patch applied.

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