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261.2

Pull #66

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[ADD] convert_binary_field_to_attachment

This method converts the 8.0 binary fields to attachments like Odoo 9.0
makes with the new attachment=True attribute. It has to be called on
post-migration script, as there's a call to get the res_name of the
target model, which is not yet loaded on pre-migration.

You need to rename the involved column in pre-migration script if you
don't want to lose your data in the process.

This method also removes after the conversion the source column for
avoiding data duplication.

This is done through Odoo ORM, because there's a lot of logic associated
with guessing MIME type, format and length, file saving in store...
that is doesn't worth to recreate it via SQL as there's not too much
performance problem.

:param env: Odoo environment
:param field_spec: A dictionary with the ORM model name as key, and as
    dictionary values a tuple with:
        * field name to be converted as attachment as first element.
        * SQL column name that contains actual data as second element. If
          the second element is None, then the column name is taken
          calling `get_legacy_name` method, which is the typical technique.

* field name to be converted as attachment as first element.
* SQL column name that contains actual data as second element. If
  the second element is None, then the column name is taken
  calling `get_legacy_name` method.
Pull Request #66: [ADD] convert_binary_field_to_attachment

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