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[Slawek Kaplonski <1685352@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

If something like:

    inspector = reflection.Inspector.from_engine(op.get_bind())

is used in alembic migration scripts in functions
expand_drop_exceptions() or contract_creation_exceptions() then there is
error like:

    NameError: Can't invoke function 'get_bind', as the proxy object has
not yet been established for the Alembic 'Operations' class.  Try
placing this code inside a callable.

Those 2 functions are used only in functional tests but it would be nice
to have possibility to use this Inspector class for example to get names
of constraints from database.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: db

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https://bugs.launchpad.net/bugs/1685352

Title:
  Can't invoke function 'get_bind' from alembic.op in
  expand_drop_exceptions function in alembic migration scripts

Status in neutron:
  New

Bug description:
  If something like:

      inspector = reflection.Inspector.from_engine(op.get_bind())

  is used in alembic migration scripts in functions
  expand_drop_exceptions() or contract_creation_exceptions() then there
  is error like:

      NameError: Can't invoke function 'get_bind', as the proxy object
  has not yet been established for the Alembic 'Operations' class.  Try
  placing this code inside a callable.

  Those 2 functions are used only in functional tests but it would be
  nice to have possibility to use this Inspector class for example to
  get names of constraints from database.

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