82 lines
2.6 KiB
Python
82 lines
2.6 KiB
Python
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from django.db import models
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from django.db.models.loading import BaseAppCache
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class ProjectState(object):
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"""
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Represents the entire project's overall state.
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This is the item that is passed around - we do it here rather than at the
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app level so that cross-app FKs/etc. resolve properly.
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"""
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def __init__(self, models=None):
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self.models = models or {}
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self.app_cache = None
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def clone(self):
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"Returns an exact copy of this ProjectState"
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ps = ProjectState(
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models = dict((k, v.copy()) for k, v in self.models.items())
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)
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for model in ps.models.values():
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model.project_state = ps
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return ps
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def render(self):
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"Turns the project state into actual models in a new AppCache"
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if self.app_cache is None:
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self.app_cache = BaseAppCache()
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for model in self.model.values:
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model.render(self.app_cache)
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return self.app_cache
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class ModelState(object):
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"""
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Represents a Django Model. We don't use the actual Model class
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as it's not designed to have its options changed - instead, we
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mutate this one and then render it into a Model as required.
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"""
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def __init__(self, project_state, app_label, name, fields=None, options=None, bases=None):
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self.project_state = project_state
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self.app_label = app_label
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self.name = name
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self.fields = fields or []
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self.options = options or {}
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self.bases = bases or None
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def clone(self):
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"Returns an exact copy of this ModelState"
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return self.__class__(
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project_state = self.project_state,
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app_label = self.app_label,
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name = self.name,
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fields = self.fields,
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options = self.options,
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bases = self.bases,
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)
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def render(self, app_cache):
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"Creates a Model object from our current state into the given app_cache"
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# First, make a Meta object
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meta_contents = {'app_label': self.app_label, "app_cache": app_cache}
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meta_contents.update(self.options)
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meta = type("Meta", tuple(), meta_contents)
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# Then, work out our bases
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# TODO: Use the actual bases
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if self.bases:
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raise NotImplementedError("Custom bases not quite done yet!")
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else:
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bases = [models.Model]
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# Turn fields into a dict for the body, add other bits
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body = dict(self.fields)
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body['Meta'] = meta
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body['__module__'] = "__fake__"
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# Then, make a Model object
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return type(
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self.name,
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tuple(bases),
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body,
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)
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