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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
import json
from django.contrib.postgres import lookups
from django.contrib.postgres.forms import SimpleArrayField
from django.contrib.postgres.validators import ArrayMaxLengthValidator
from django.core import checks, exceptions
from django.db.models import Field, Transform, IntegerField
from django.utils import six
from django.utils.translation import string_concat, ugettext_lazy as _
__all__ = ['ArrayField']
class AttributeSetter(object):
def __init__(self, name, value):
setattr(self, name, value)
class ArrayField(Field):
empty_strings_allowed = False
default_error_messages = {
'item_invalid': _('Item %(nth)s in the array did not validate: '),
'nested_array_mismatch': _('Nested arrays must have the same length.'),
}
def __init__(self, base_field, size=None, **kwargs):
self.base_field = base_field
self.size = size
if self.size:
self.default_validators = self.default_validators[:]
self.default_validators.append(ArrayMaxLengthValidator(self.size))
super(ArrayField, self).__init__(**kwargs)
def check(self, **kwargs):
errors = super(ArrayField, self).check(**kwargs)
if self.base_field.rel:
errors.append(
checks.Error(
'Base field for array cannot be a related field.',
hint=None,
obj=self,
id='postgres.E002'
)
)
else:
# Remove the field name checks as they are not needed here.
base_errors = self.base_field.check()
if base_errors:
messages = '\n '.join('%s (%s)' % (error.msg, error.id) for error in base_errors)
errors.append(
checks.Error(
'Base field for array has errors:\n %s' % messages,
hint=None,
obj=self,
id='postgres.E001'
)
)
return errors
def set_attributes_from_name(self, name):
super(ArrayField, self).set_attributes_from_name(name)
self.base_field.set_attributes_from_name(name)
@property
def description(self):
return 'Array of %s' % self.base_field.description
def db_type(self, connection):
size = self.size or ''
return '%s[%s]' % (self.base_field.db_type(connection), size)
def get_db_prep_value(self, value, connection, prepared=False):
if isinstance(value, list) or isinstance(value, tuple):
return [self.base_field.get_db_prep_value(i, connection, prepared) for i in value]
return value
def deconstruct(self):
name, path, args, kwargs = super(ArrayField, self).deconstruct()
if path == 'django.contrib.postgres.fields.array.ArrayField':
path = 'django.contrib.postgres.fields.ArrayField'
kwargs.update({
'base_field': self.base_field,
'size': self.size,
})
return name, path, args, kwargs
def to_python(self, value):
if isinstance(value, six.string_types):
# Assume we're deserializing
vals = json.loads(value)
value = [self.base_field.to_python(val) for val in vals]
return value
def value_to_string(self, obj):
values = []
vals = self._get_val_from_obj(obj)
base_field = self.base_field
for val in vals:
obj = AttributeSetter(base_field.attname, val)
values.append(base_field.value_to_string(obj))
return json.dumps(values)
def get_transform(self, name):
transform = super(ArrayField, self).get_transform(name)
if transform:
return transform
try:
index = int(name)
except ValueError:
pass
else:
index += 1 # postgres uses 1-indexing
return IndexTransformFactory(index, self.base_field)
try:
start, end = name.split('_')
start = int(start) + 1
end = int(end) # don't add one here because postgres slices are weird
except ValueError:
pass
else:
return SliceTransformFactory(start, end)
def validate(self, value, model_instance):
super(ArrayField, self).validate(value, model_instance)
for i, part in enumerate(value):
try:
self.base_field.validate(part, model_instance)
except exceptions.ValidationError as e:
raise exceptions.ValidationError(
string_concat(self.error_messages['item_invalid'], e.message),
code='item_invalid',
params={'nth': i},
)
if isinstance(self.base_field, ArrayField):
if len({len(i) for i in value}) > 1:
raise exceptions.ValidationError(
self.error_messages['nested_array_mismatch'],
code='nested_array_mismatch',
)
def formfield(self, **kwargs):
defaults = {
'form_class': SimpleArrayField,
'base_field': self.base_field.formfield(),
'max_length': self.size,
}
defaults.update(kwargs)
return super(ArrayField, self).formfield(**defaults)
@ArrayField.register_lookup
class ArrayContains(lookups.DataContains):
def as_sql(self, qn, connection):
sql, params = super(ArrayContains, self).as_sql(qn, connection)
sql += '::%s' % self.lhs.output_field.db_type(connection)
return sql, params
@ArrayField.register_lookup
class ArrayContainedBy(lookups.ContainedBy):
def as_sql(self, qn, connection):
sql, params = super(ArrayContainedBy, self).as_sql(qn, connection)
sql += '::%s' % self.lhs.output_field.db_type(connection)
return sql, params
@ArrayField.register_lookup
class ArrayOverlap(lookups.Overlap):
def as_sql(self, qn, connection):
sql, params = super(ArrayOverlap, self).as_sql(qn, connection)
sql += '::%s' % self.lhs.output_field.db_type(connection)
return sql, params
@ArrayField.register_lookup
class ArrayLenTransform(Transform):
lookup_name = 'len'
output_field = IntegerField()
def as_sql(self, compiler, connection):
lhs, params = compiler.compile(self.lhs)
return 'array_length(%s, 1)' % lhs, params
class IndexTransform(Transform):
def __init__(self, index, base_field, *args, **kwargs):
super(IndexTransform, self).__init__(*args, **kwargs)
self.index = index
self.base_field = base_field
def as_sql(self, compiler, connection):
lhs, params = compiler.compile(self.lhs)
return '%s[%s]' % (lhs, self.index), params
@property
def output_field(self):
return self.base_field
class IndexTransformFactory(object):
def __init__(self, index, base_field):
self.index = index
self.base_field = base_field
def __call__(self, *args, **kwargs):
return IndexTransform(self.index, self.base_field, *args, **kwargs)
class SliceTransform(Transform):
def __init__(self, start, end, *args, **kwargs):
super(SliceTransform, self).__init__(*args, **kwargs)
self.start = start
self.end = end
def as_sql(self, compiler, connection):
lhs, params = compiler.compile(self.lhs)
return '%s[%s:%s]' % (lhs, self.start, self.end), params
class SliceTransformFactory(object):
def __init__(self, start, end):
self.start = start
self.end = end
def __call__(self, *args, **kwargs):
return SliceTransform(self.start, self.end, *args, **kwargs)
|
