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62 lines
1.6 KiB
62 lines
1.6 KiB
from django.db.models.base import ModelBase
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from django.db import connection
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from django.db import models
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from django.db.models.fields.files import ImageFieldFile
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class SafeImageFieldFile(ImageFieldFile):
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@property
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def width(self):
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try:
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return self.width
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except:
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return None
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@property
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def height(self):
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try:
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return self.height
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except:
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return None
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class SafeImageField(models.ImageField):
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attr_class = SafeImageFieldFile
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class ModelFieldsNames(object):
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def __init__(self, model):
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self.alias = None
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self._meta = model._meta
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def __getattr__(self, name):
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alias = '__as__'
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if name.startswith(alias):
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self.alias = name[len(alias):]
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return '%s as %s' % (self._meta.db_table, self.alias)
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field = self._meta.get_field(name).get_attname_column()[1]
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if self.alias:
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return u"%s.%s" % (self.alias, field)
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else:
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return u"%s.%s" % (self._meta.db_table, field)
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def __str__(self):
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return '%s' % self._meta.db_table
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def format_sql(sql, **kwargs):
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for name, value in kwargs.items():
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if issubclass(type(value), ModelBase):
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kwargs[name] = ModelFieldsNames(value)
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elif isinstance(value, (tuple, list)):
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kwargs[name] = ','.join(map(lambda x: repr(x) if isinstance(x, str) else str(x), value))
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elif not isinstance(value, str):
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kwargs[name] = value
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return sql.format(**kwargs)
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def execute_sql(sql, args=()):
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cursor = connection.cursor()
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cursor.execute(sql, args)
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return cursor.fetchall()
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