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59 lines
2.3 KiB
Python
59 lines
2.3 KiB
Python
#
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# dbevolution.py -- Helpers for database evolutions
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#
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# Copyright (c) 2008-2009 Christian Hammond
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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from django_evolution.mutations import BaseMutation
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class FakeChangeFieldType(BaseMutation):
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"""
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Changes the type of the field to a similar type.
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This is intended only when the new type is really a version of the
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old type, such as a subclass of that Field object. The two fields
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should be compatible or there could be migration issues.
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"""
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def __init__(self, model_name, field_name, new_type):
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self.model_name = model_name
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self.field_name = field_name
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self.new_type = new_type
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def __str__(self):
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return "FakeChangeFieldType('%s', '%s', '%s')" % \
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(self.model_name, self.field_name, self.new_type)
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def simulate(self, app_label, proj_sig):
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app_sig = proj_sig[app_label]
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model_sig = app_sig[self.model_name]
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field_dict = model_sig['fields']
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field_sig = field_dict[self.field_name]
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field_sig['field_type'] = self.new_type
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def mutate(self, app_label, proj_sig):
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# We can just call simulate, since it does the same thing.
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# We're not actually generating SQL, but rather tricking
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# Django Evolution.
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self.simulate(app_label, proj_sig)
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return ""
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