/
model.py
517 lines (433 loc) · 18.6 KB
/
model.py
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"""
Define the csv model base classe
"""
import copy
import csv
from django.db.models.base import Model
from adaptor.fields import Field, IgnoredField, ComposedKeyField, XMLRootField
from adaptor.exceptions import ForeignKeyFieldError, FieldValueMissing
class ImproperlyConfigured(Exception):
"""
Raised if a missing config value is detected
"""
pass
class CsvException(Exception):
"""
Raised if a problem in the file is detected
"""
pass
class CsvDataException(CsvException):
"""
Raised if a data does not match the expectations
"""
def __init__(self, line, error=None, field_error=None):
self.line = line + 1
self.error = error
self.field_error = field_error
if self.error:
Exception.__init__(self, u"Line %d: %s" % (self.line, self.error))
elif self.field_error:
Exception.__init__(self, u"Line %d: %s" % (self.line,
self.field_error))
class CsvFieldDataException(CsvDataException):
def __init__(self, line, field_error, model, value):
self.model = model
self.value = value
CsvDataException.__init__(self, line, field_error=field_error)
class SkipRow(Exception):
pass
class BaseModel(object):
def __init__(self, data, delimiter=None):
self.cls = self.__class__
self.attrs = self.get_fields()
@classmethod
def get_fields(cls):
all_cls_dict = {}
all_cls_dict.update(cls.__dict__)
for klass in cls.__bases__:
all_cls_dict.update(klass.__dict__)
# Add a copy the attribute to not have interference between differente instance
# of a same class
attributes = [(attr, copy.copy(all_cls_dict[attr])) for attr in all_cls_dict
if isinstance(all_cls_dict[attr],
Field)]
for fieldname, field in attributes:
field.fieldname = fieldname
sorted_field = sorted(attributes, key=lambda attrs: attrs[1].position)
return sorted_field
@classmethod
def get_data_fields(cls):
return [fieldname for (fieldname, field) in cls.get_fields() if fieldname not in getattr(cls, "_exclude_data_fields", [])]
def as_dict(self):
return dict((field, getattr(self, field)) for field in self.get_data_fields())
def get_value(self, attr_name, field, value):
self.__dict__[attr_name] = field.get_prep_value(value)
self.field_matching_name = field.__dict__.get("match", attr_name)
return field.get_prep_value(value)
def update_object(self, dict_values, object, update_dict):
new_dict_values = {}
if 'update' in update_dict:
# Update the object for the value un update_dict['update']
# only
for field_name in update_dict['update']:
new_dict_values[field_name] = dict_values[field_name]
else:
new_dict_values = dict_values
for field_name in new_dict_values:
setattr(object, field_name, new_dict_values[field_name])
object.save()
def base_create_model(self, model, **dict_values):
object = None
if self.cls.has_update_method():
keys = None
update_dict = self.cls.Meta.update
try:
keys = update_dict['keys']
except KeyError:
raise ImproperlyConfigured("The update dict should contains a keys value")
filter_values = {}
for key in keys:
filter_values.update({key: dict_values[key]})
object = None
try:
object = model.objects.get(**filter_values)
except model.DoesNotExist:
object = model.objects.create(**dict_values)
except model.MultipleObjectsReturned:
raise ImproperlyConfigured(
"Multiple values returned for the update key %s.\
Keys provide are not unique" % filter_values)
else:
self.update_object(dict_values, object, update_dict)
else:
object = model.objects.create(**dict_values)
self.object = object
def get_object(self):
if self.cls.is_db_model():
return self.object
return None
def create_model_instance(self, values):
model = self.cls.Meta.dbModel
if self.multiple_creation_field:
if self.multiple_creation_field:
multiple_values = values.pop(self.multiple_creation_field)
for value in multiple_values:
dict_values = values.copy()
dict_values[self.multiple_creation_field] = value
self.base_create_model(model, **dict_values)
else:
self.base_create_model(model, **values)
def set_values(self, values_dict, fields_name, values):
if isinstance(fields_name, list):
for field_name in fields_name:
values_dict[field_name] = values
else:
values_dict[fields_name] = values
def construct_obj_from_model(self, object):
for field_name, field in self.get_fields():
setattr(self,
field_name,
getattr(object,
# If match attribute is defined, use the match name,
# else use the field name
field.__dict__.get("match", field_name), None))
return self
def export(self):
line = u""
for field_name, field in self.get_fields():
line += unicode(getattr(self, field_name))
line += self.delimiter
return line.rstrip(self.delimiter) # remove the extra delimiter
@classmethod
def is_db_model(cls):
return hasattr(cls, "Meta") and hasattr(cls.Meta, "dbModel") and cls.Meta.dbModel
@classmethod
def has_class_delimiter(cls):
return hasattr(cls, "Meta") and hasattr(cls.Meta, "delimiter")
@classmethod
def has_header(cls):
return hasattr(cls, "Meta") and hasattr(cls.Meta, "has_header") and cls.Meta.has_header
@classmethod
def has_update_method(cls):
has_update = hasattr(cls, "Meta") and hasattr(cls.Meta, "update")
if has_update and not cls.is_db_model():
raise ImproperlyConfigured("You should define a model when using the update option")
return has_update
@classmethod
def silent_failure(cls):
if not hasattr(cls, "Meta") or not hasattr(cls.Meta, "silent_failure"):
return False
return cls.Meta.silent_failure
@classmethod
def import_data(cls, data, extra_fields=[]):
importer = cls.get_importer(extra_fields)
return importer.import_data(data)
@classmethod
def import_from_filename(cls, filename, extra_fields=[]):
importer = cls.get_importer(extra_fields=extra_fields)
return importer.import_from_filename(filename)
@classmethod
def import_from_file(cls, file, extra_fields=[]):
importer = cls.get_importer(extra_fields=extra_fields)
return importer.import_from_file(file)
class CsvModel(BaseModel):
def __init__(self, data, delimiter=None):
super(CsvModel, self).__init__(data)
self.delimiter = None
if delimiter:
self.delimiter = delimiter
elif self.has_class_delimiter():
self. delimiter = self.cls.Meta.delimiter
if not isinstance(data, Model):
self.construct_obj_from_data(data)
else:
self.construct_obj_from_model(data)
def validate(self):
if len(self.attrs) == 0:
raise ImproperlyConfigured("No field defined. Should have at least one field in the model.")
if not self.cls.has_class_delimiter() and not getattr(self, "delimiter", False) and len(self.attrs) > 1:
raise ImproperlyConfigured(
"More than a single field and no delimiter defined. You should define a delimiter.")
@classmethod
def get_importer(cls, extra_fields=[]):
return CsvImporter(csvModel=cls, extra_fields=extra_fields)
def construct_obj_from_data(self, data):
self.validate()
values = {}
silent_failure = self.cls.silent_failure()
self.multiple_creation_field = None
composed_fields = []
index_offset = 0
data_offset = 0
for position, (attr_name, field) in enumerate(self.attrs):
field.position = position
if isinstance(field, ComposedKeyField):
composed_fields.append(field)
index_offset += 1
continue
if self.cls.has_class_delimiter() or self.delimiter:
value = data.pop(position - index_offset - data_offset)
data_offset += 1
else:
value = data.pop(0)
try:
if isinstance(field, IgnoredField):
continue
if hasattr(field, 'has_multiple') and field.has_multiple:
remaining_data = [value] + data[:] # value should be re-added
# as it has been pop before
multiple_values = []
for data in remaining_data:
multiple_values.append(self.get_value(attr_name, field, data))
self.set_values(values, self.field_matching_name, multiple_values)
self.multiple_creation_field = self.field_matching_name
else:
value = self.get_value(attr_name, field, value)
self.set_values(values, self.field_matching_name, value)
except ValueError, e:
if silent_failure:
raise SkipRow()
else:
raise e
if self.cls.is_db_model():
for field in composed_fields:
keys = {}
for key in field.keys:
keys[key] = values.pop(key)
values[self.field_matching_name] = self.get_value(attr_name, field, keys)
self.create_model_instance(values)
class CsvDbModel(CsvModel):
def validate(self):
if not self.cls.is_db_model():
raise ImproperlyConfigured("dbModel attribute is missing \
or wrongly configured in the \
CsvDbModel class.")
@classmethod
def get_fields(cls):
cls_attrs = super(CsvDbModel, cls).get_fields()
if len(cls_attrs) != 0:
raise ImproperlyConfigured("A Db model should not have any csv field defined.")
attrs = []
if cls.is_db_model():
model = cls.Meta.dbModel
for field in model._meta.fields:
attrs.append((field.name, field))
excluded_fields = cls.get_exclusion_fields()
attrs_filtered = [attr for attr in attrs if attr[0] not in excluded_fields]
return attrs_filtered
@classmethod
def get_exclusion_fields(cls):
list_exclusion = []
if hasattr(cls, "Meta") and hasattr(cls.Meta, "exclude"):
list_exclusion.append(*cls.Meta.exclude)
if 'id' not in list_exclusion:
list_exclusion.append('id')
return list_exclusion
class XMLModel(BaseModel):
_exclude_data_fields = ['root']
def __init__(self, data, element=None):
super(XMLModel, self).__init__(data)
self._base_root = element
self.construct_obj_from_data(data)
def validate(self):pass
@classmethod
def get_root_field(cls):
for field_name, field in cls.get_fields():
if type(field) == XMLRootField:
return field_name, field
return None
def construct_obj_from_data(self, data):
for field_name, field in self.attrs:
field.set_root(self._base_root)
try:
self.__dict__[field_name] = field.get_prep_value(data, instance=self)
except IndexError:
raise FieldValueMissing(field_name)
@classmethod
def get_importer(cls, *args):
return XMLImporter(model=cls)
class XMLImporter(object):
def __init__(self, model):
self.model = model
def import_data(self, data):
root_name, root_field = self.model.get_root_field()
objects = []
for element in root_field.get_root(data):
object = self.model(data, element)
objects.append(object)
return objects
class LinearLayout(object):
def process_line(self, lines, line, model, delimiter):
fields = model.get_fields()
multiple_index = 0
for index, (fieldname, field) in enumerate(fields):
if hasattr(field, "has_multiple") and field.has_multiple:
multiple_index = index
multiple_index_fieldname = fieldname
break
if multiple_index:
if not line[multiple_index:]:
raise ValueError("No value found for column %s" % multiple_index_fieldname)
for index, val in enumerate(line[multiple_index:]):
line_ = line[0:multiple_index] + [line[multiple_index + index]]
value = model(data=line_, delimiter=delimiter)
lines.append(value)
else:
# Need to keep that to preserve the side effect on line
value = model(data=line, delimiter=delimiter)
lines.append(value)
return value
class TabularLayout(object):
def __init__(self):
self.line_no = 0
self.column_no = 1
self.headers = None
def process_line(self, lines, line, model, delimiter):
value = None
if self.line_no == 0:
self.headers = line
self.line_no += 1
else:
for data in line[1:]:
inline_data = [line[0], self.headers[self.column_no], data]
value = model(data=inline_data, delimiter=delimiter)
lines.append(value)
self.column_no += 1
self.column_no = 1
return value
class GroupedCsvModel(CsvModel):
@classmethod
def get_importer(cls, extra_fields=[]):
return GroupedCsvImporter(csvModel=cls, extra_fields=extra_fields)
@classmethod
def has_csv_models(cls):
return hasattr(cls, "Meta") and hasattr(cls.Meta, "has_header") and cls.Meta.has_header
def validate(self):
if len(self.attrs) != 0:
raise ImproperlyConfigured("You cannot define fields in \
a grouped csv model.")
if not hasattr(self.cls, "csv_models") or\
not isinstance(self.cls.csv_models, list) or\
len(self.cls.csv_models) == 0:
raise ImproperlyConfigured("Group csv models should define a\
non empty csv_models list attribute.")
class CsvImporter(object):
def __init__(self, csvModel, extra_fields=[], layout=None):
self.csvModel = csvModel
self.extra_fields = extra_fields
self.dialect = None
self.delimiter = None
if not layout:
if hasattr(self.csvModel, 'Meta') and hasattr(self.csvModel.Meta, 'layout'):
self.layout = self.csvModel.Meta.layout()
else:
self.layout = LinearLayout()
def process_extra_fields(self, data, line):
data_length = len(line)
if self.extra_fields:
extra_field_index = 0
for value in self.extra_fields:
if isinstance(value, str):
line.append(value)
elif isinstance(value, dict):
position = value.get('position', len(data) + extra_field_index)
if not 'value' in value:
raise CsvException("If a positional extra argument is \
defined, a value key should \
be present.")
line.insert(position, value['value'])
else:
raise ImproperlyConfigured("Extra field should be a string or a list")
def import_data(self, data):
lines = []
self.get_class_delimiter()
line_number = 0
for line in csv.reader(data, delimiter=self.delimiter):
self.process_line(data, line, lines, line_number, self.csvModel)
line_number += 1
return lines
def process_line(self, data, line, lines, line_number, model):
self.process_extra_fields(data, line)
value = None
try:
value = self.layout.process_line(lines, line, model, delimiter=self.delimiter)
except SkipRow:
pass
except ForeignKeyFieldError, e:
raise CsvFieldDataException(line_number, field_error=e.message, model=e.model, value=e.value)
except ValueError, e:
if line_number == 0 and self.csvModel.has_header():
pass
else:
raise CsvDataException(line_number, field_error=e.message)
except IndexError, e:
raise CsvDataException(line_number, error="Number of fields invalid")
return value
def get_class_delimiter(self):
if not self.delimiter and hasattr(self.csvModel, 'Meta') and hasattr(self.csvModel.Meta, 'delimiter'):
self.delimiter = self.csvModel.Meta.delimiter
def import_from_filename(self, filename):
csv_file = open(filename)
return self.import_from_file(csv_file)
def import_from_file(self, csv_file):
self.get_class_delimiter()
if not self.delimiter:
dialect = csv.Sniffer().sniff(csv_file.read(1024))
self.delimiter = dialect.delimiter
csv_file.seek(0)
return self.import_data(csv_file)
def __getitem__(self, item):
return self.lines[item]
def __iter__(self):
return self.lines.__iter__()
class GroupedCsvImporter(CsvImporter):
def process_line(self, data, line, lines, line_number, model):
previous_value = None
for model in self.csvModel.csv_models:
if isinstance(model, dict):
if "use" in model:
line.insert(0, previous_value.get_object().id)
previous_value = super(GroupedCsvImporter, self).process_line(data, line, lines, line_number,
model['model'])
else:
super(GroupedCsvImporter, self).process_line(data, line, lines, line_number, model)