-
-
Notifications
You must be signed in to change notification settings - Fork 782
/
mixins.py
182 lines (147 loc) · 6.13 KB
/
mixins.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
import logging
from warnings import warn
from django.conf import settings
from django.http import HttpResponse
from django.utils.timezone import now
from django.views.generic.edit import FormView
from .formats import base_formats
from .forms import SelectableFieldsExportForm
from .resources import modelresource_factory
from .signals import post_export
logger = logging.getLogger(__name__)
class BaseImportExportMixin:
resource_classes = []
@property
def formats(self):
return getattr(settings, "IMPORT_EXPORT_FORMATS", base_formats.DEFAULT_FORMATS)
@property
def export_formats(self):
return getattr(settings, "EXPORT_FORMATS", self.formats)
@property
def import_formats(self):
return getattr(settings, "IMPORT_FORMATS", self.formats)
def check_resource_classes(self, resource_classes):
if resource_classes and not hasattr(resource_classes, "__getitem__"):
raise Exception(
"The resource_classes field type must be "
"subscriptable (list, tuple, ...)"
)
def get_resource_classes(self):
"""Return subscriptable type (list, tuple, ...) containing resource classes"""
if not self.resource_classes:
return [modelresource_factory(self.model)]
return self.resource_classes
def get_resource_kwargs(self, request, *args, **kwargs):
return {}
def get_resource_index(self, form):
resource_index = 0
if form and "resource" in form.cleaned_data:
try:
resource_index = int(form.cleaned_data["resource"])
except ValueError:
pass
return resource_index
class BaseImportMixin(BaseImportExportMixin):
def get_import_resource_classes(self):
"""
Returns ResourceClass subscriptable (list, tuple, ...) to use for import.
"""
resource_classes = self.get_resource_classes()
self.check_resource_classes(resource_classes)
return resource_classes
def get_import_formats(self):
"""
Returns available import formats.
"""
return [f for f in self.import_formats if f().can_import()]
def get_import_resource_kwargs(self, request, **kwargs):
return self.get_resource_kwargs(request, **kwargs)
def choose_import_resource_class(self, form):
resource_index = self.get_resource_index(form)
return self.get_import_resource_classes()[resource_index]
class BaseExportMixin(BaseImportExportMixin):
model = None
def get_export_formats(self):
"""
Returns available export formats.
"""
return [f for f in self.export_formats if f().can_export()]
def get_export_resource_classes(self):
"""
Returns ResourceClass subscriptable (list, tuple, ...) to use for export.
"""
resource_classes = self.get_resource_classes()
self.check_resource_classes(resource_classes)
return resource_classes
def choose_export_resource_class(self, form):
resource_index = self.get_resource_index(form)
return self.get_export_resource_classes()[resource_index]
def get_export_resource_kwargs(self, request, **kwargs):
return self.get_resource_kwargs(request, **kwargs)
def get_export_resource_fields_from_from(self, form):
if isinstance(form, SelectableFieldsExportForm):
export_fields = form.get_selected_resource_export_fields()
if export_fields:
return export_fields
return
def get_data_for_export(self, request, queryset, **kwargs):
export_form = kwargs.get("export_form")
export_class = self.choose_export_resource_class(export_form)
export_resource_kwargs = self.get_export_resource_kwargs(request, **kwargs)
export_fields = self.get_export_resource_fields_from_from(export_form)
cls = export_class(**export_resource_kwargs)
export_data = cls.export(
queryset=queryset, export_fields=export_fields, **kwargs
)
return export_data
def get_export_filename(self, file_format):
date_str = now().strftime("%Y-%m-%d")
filename = "%s-%s.%s" % (
self.model.__name__,
date_str,
file_format.get_extension(),
)
return filename
class ExportViewMixin(BaseExportMixin):
form_class = SelectableFieldsExportForm
def get_export_data(self, file_format, queryset, *args, **kwargs):
"""
Returns file_format representation for given queryset.
"""
data = self.get_data_for_export(self.request, queryset, *args, **kwargs)
export_data = file_format.export_data(data)
return export_data
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
return context
def get_form_kwargs(self):
kwargs = super().get_form_kwargs()
kwargs["formats"] = self.get_export_formats()
kwargs["resources"] = self.get_export_resource_classes()
return kwargs
class ExportViewFormMixin(ExportViewMixin, FormView):
def form_valid(self, form):
warn(
"ExportViewFormMixin is deprecated and will be removed "
"in a future release",
DeprecationWarning,
stacklevel=2,
)
formats = self.get_export_formats()
file_format = formats[int(form.cleaned_data["format"])]()
if hasattr(self, "get_filterset"):
queryset = self.get_filterset(self.get_filterset_class()).qs
else:
queryset = self.get_queryset()
export_data = self.get_export_data(file_format, queryset)
content_type = file_format.get_content_type()
# Django 1.7 uses the content_type kwarg instead of mimetype
try:
response = HttpResponse(export_data, content_type=content_type)
except TypeError:
response = HttpResponse(export_data, mimetype=content_type)
response["Content-Disposition"] = 'attachment; filename="%s"' % (
self.get_export_filename(file_format),
)
post_export.send(sender=None, model=self.model)
return response