Dynamodb2 Table.get_item() throws ValidationException “Le nombre de conditions sur les touches n'est pas valide”

Je suis juste faire une tâche simple dans DynamoDB:

Créer une Table,
Ajouter un Élément
Interroger la Table pour cet Article.

Voici un script que j'utilise:

from boto.dynamodb2.fields import HashKey, RangeKey, AllIndex, GlobalAllIndex
from boto.dynamodb2.items import Item
from boto.dynamodb2.layer1 import DynamoDBConnection
from boto.dynamodb2.table import Table
# Using DynamoDB Local
conn = DynamoDBConnection(host='localhost', port=8000, is_secure=False)
## ----- Create a table -----
throughput = {
'write': 1,
'read': 1
}
schema = [
HashKey('id'),
RangeKey('rating')
]
local_indexes = [
AllIndex('local_all_index_seats', parts=[
HashKey('id'),
RangeKey('seats')
])
]
global_indexes = [
GlobalAllIndex('global_all_index_color', parts=[
HashKey('color'),
RangeKey('rating')
])
]
new_table = Table.create('items', schema=schema, indexes=local_indexes,
global_indexes=global_indexes, connection=conn,
throughput=throughput)
print 'Table created'
## -------- Table created ---------
## -------- Add an item --------
items_table = Table('items', connection=conn)  # New reference to the table we created
new_item_data = {
"category": "Sofa",
"rating": "4",
"color": "beige",
"seats": "6",
"id": "first_id"
}
new_item = Item(items_table, new_item_data)
new_item.save()
print 'New item saved'
## -------- Item added --------
## -------- Query Item --------
items_table = Table('items', connection=conn)  # New reference to the table we created
queried_item = items_table.get_item(id='first_id')
print 'Query done. Category is: {}'.format(queried_item['Category'])
## -------- Querying Done --------

Lorsque j'exécute ce script, j'obtiens un ValidationException:

(backend)aniket [~/PycharmProjects/website_backend] -> python reproduce.py                                                                                 ±[●●][master]
Table created
New item saved
Traceback (most recent call last):
File "reproduce.py", line 59, in <module>
queried_item = items_table.get_item(id='first_id')
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/table.py", line 705, in get_item
consistent_read=consistent
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 1099, in get_item
body=json.dumps(params))
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2842, in make_request
retry_handler=self._retry_handler)
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/connection.py", line 954, in _mexe
status = retry_handler(response, i, next_sleep)
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2882, in _retry_handler
response.status, response.reason, data)
boto.dynamodb2.exceptions.ValidationException: ValidationException: 400 Bad Request
{u'Message': u'The number of conditions on the keys is invalid', u'__type': u'com.amazon.coral.validate#ValidationException'}

Je suis assez sûr que je suis en train de faire quelque chose de mal, mais je ne peux pas comprendre ce que. Le DynamoDB Docs mentionner qu'il est possible de requête à l'aide de seulement la HashKey, donc ce que je fais semble être assez normal.

Dans le cas où cela peut aider, j'ai aussi ajouté de l'enregistrement de débogage, et voici le résultat:

(backend)aniket [~/PycharmProjects/website_backend] -> python reproduce.py                                                                                 ±[●●][master]
2015-04-15 20:04:48,218 [DEBUG] (boto) Using access key found in shared credential file.
2015-04-15 20:04:48,218 [DEBUG] (boto) Using secret key found in shared credential file.
2015-04-15 20:04:48,219 [DEBUG] (boto) Method: POST
2015-04-15 20:04:48,219 [DEBUG] (boto) Path: /
2015-04-15 20:04:48,219 [DEBUG] (boto) Data: {"GlobalSecondaryIndexes": [{"KeySchema": [{"KeyType": "HASH", "AttributeName": "color"}, {"KeyType": "RANGE", "AttributeName": "rating"}], "IndexName": "global_all_index_color", "Projection": {"ProjectionType": "ALL"}, "ProvisionedThroughput": {"WriteCapacityUnits": 5, "ReadCapacityUnits": 5}}], "AttributeDefinitions": [{"AttributeName": "id", "AttributeType": "S"}, {"AttributeName": "rating", "AttributeType": "S"}, {"AttributeName": "seats", "AttributeType": "S"}, {"AttributeName": "color", "AttributeType": "S"}], "LocalSecondaryIndexes": [{"KeySchema": [{"KeyType": "HASH", "AttributeName": "id"}, {"KeyType": "RANGE", "AttributeName": "seats"}], "IndexName": "local_all_index_seats", "Projection": {"ProjectionType": "ALL"}}], "ProvisionedThroughput": {"WriteCapacityUnits": 1, "ReadCapacityUnits": 1}, "TableName": "items", "KeySchema": [{"KeyType": "HASH", "AttributeName": "id"}, {"KeyType": "RANGE", "AttributeName": "rating"}]}
2015-04-15 20:04:48,219 [DEBUG] (boto) Headers: {'Host': 'localhost', 'Content-Type': 'application/x-amz-json-1.0', 'Content-Length': '942', 'X-Amz-Target': 'DynamoDB_20120810.CreateTable'}
2015-04-15 20:04:48,219 [DEBUG] (boto) Host: localhost
2015-04-15 20:04:48,219 [DEBUG] (boto) Port: 8000
2015-04-15 20:04:48,219 [DEBUG] (boto) Params: {}
2015-04-15 20:04:48,219 [DEBUG] (boto) establishing HTTP connection: kwargs={'port': 8000, 'timeout': 70}
2015-04-15 20:04:48,219 [DEBUG] (boto) Token: None
2015-04-15 20:04:48,219 [DEBUG] (boto) CanonicalRequest:
POST
/
host:localhost
x-amz-date:20150415T143448Z
x-amz-target:DynamoDB_20120810.CreateTable
host;x-amz-date;x-amz-target
4d4b471da224cff0353d444ba9f31ecbda7ac332b618c8db038940477cf5fbd9
2015-04-15 20:04:48,219 [DEBUG] (boto) StringToSign:
AWS4-HMAC-SHA256
20150415T143448Z
20150415/localhost/localhost/aws4_request
a54fd62c95217cf6fafe69876388ac3ae8ffd4b2d87e23f71a131741d3e64792
2015-04-15 20:04:48,219 [DEBUG] (boto) Signature:
51e3035fcfef8b31f8d6c0e22779ba4b17990d3f91f8dfda6b70e559ee5c384e
2015-04-15 20:04:48,220 [DEBUG] (boto) Final headers: {'Content-Length': '942', 'User-Agent': 'Boto/2.38.0 Python/2.7.6 Linux/3.16.0-30-generic', 'Host': 'localhost', 'X-Amz-Date': '20150415T143448Z', 'X-Amz-Target': 'DynamoDB_20120810.CreateTable', 'Content-Type': 'application/x-amz-json-1.0', 'Authorization': 'AWS4-HMAC-SHA256 Credential=AKIAJW2Q5MT375WFZIMA/20150415/localhost/localhost/aws4_request,SignedHeaders=host;x-amz-date;x-amz-target,Signature=51e3035fcfef8b31f8d6c0e22779ba4b17990d3f91f8dfda6b70e559ee5c384e'}
2015-04-15 20:04:49,004 [DEBUG] (boto) Response headers: [('x-amzn-requestid', 'e4cd23ec-ad5a-4f94-8d80-dd9f002b0f28'), ('content-length', '1160'), ('content-type', 'application/x-amz-json-1.0'), ('x-amz-crc32', '175075191'), ('server', 'Jetty(8.1.12.v20130726)')]
2015-04-15 20:04:49,004 [DEBUG] (boto) Saw HTTP status: 200
2015-04-15 20:04:49,004 [DEBUG] (boto) Validating crc32 checksum for body: {"TableDescription":{"AttributeDefinitions":[{"AttributeName":"id","AttributeType":"S"},{"AttributeName":"rating","AttributeType":"S"},{"AttributeName":"seats","AttributeType":"S"},{"AttributeName":"color","AttributeType":"S"}],"TableName":"items","KeySchema":[{"AttributeName":"id","KeyType":"HASH"},{"AttributeName":"rating","KeyType":"RANGE"}],"TableStatus":"ACTIVE","CreationDateTime":1429108488.651,"ProvisionedThroughput":{"LastIncreaseDateTime":0.000,"LastDecreaseDateTime":0.000,"NumberOfDecreasesToday":0,"ReadCapacityUnits":1,"WriteCapacityUnits":1},"TableSizeBytes":0,"ItemCount":0,"LocalSecondaryIndexes":[{"IndexName":"local_all_index_seats","KeySchema":[{"AttributeName":"id","KeyType":"HASH"},{"AttributeName":"seats","KeyType":"RANGE"}],"Projection":{"ProjectionType":"ALL"},"IndexSizeBytes":0,"ItemCount":0}],"GlobalSecondaryIndexes":[{"IndexName":"global_all_index_color","KeySchema":[{"AttributeName":"color","KeyType":"HASH"},{"AttributeName":"rating","KeyType":"RANGE"}],"Projection":{"ProjectionType":"ALL"},"IndexStatus":"ACTIVE","ProvisionedThroughput":{"ReadCapacityUnits":5,"WriteCapacityUnits":5},"IndexSizeBytes":0,"ItemCount":0}]}}
2015-04-15 20:04:49,004 [DEBUG] (boto) {"TableDescription":{"AttributeDefinitions":[{"AttributeName":"id","AttributeType":"S"},{"AttributeName":"rating","AttributeType":"S"},{"AttributeName":"seats","AttributeType":"S"},{"AttributeName":"color","AttributeType":"S"}],"TableName":"items","KeySchema":[{"AttributeName":"id","KeyType":"HASH"},{"AttributeName":"rating","KeyType":"RANGE"}],"TableStatus":"ACTIVE","CreationDateTime":1429108488.651,"ProvisionedThroughput":{"LastIncreaseDateTime":0.000,"LastDecreaseDateTime":0.000,"NumberOfDecreasesToday":0,"ReadCapacityUnits":1,"WriteCapacityUnits":1},"TableSizeBytes":0,"ItemCount":0,"LocalSecondaryIndexes":[{"IndexName":"local_all_index_seats","KeySchema":[{"AttributeName":"id","KeyType":"HASH"},{"AttributeName":"seats","KeyType":"RANGE"}],"Projection":{"ProjectionType":"ALL"},"IndexSizeBytes":0,"ItemCount":0}],"GlobalSecondaryIndexes":[{"IndexName":"global_all_index_color","KeySchema":[{"AttributeName":"color","KeyType":"HASH"},{"AttributeName":"rating","KeyType":"RANGE"}],"Projection":{"ProjectionType":"ALL"},"IndexStatus":"ACTIVE","ProvisionedThroughput":{"ReadCapacityUnits":5,"WriteCapacityUnits":5},"IndexSizeBytes":0,"ItemCount":0}]}}
Table created
2015-04-15 20:04:49,004 [DEBUG] (boto) Method: POST
2015-04-15 20:04:49,004 [DEBUG] (boto) Path: /
2015-04-15 20:04:49,004 [DEBUG] (boto) Data: {"Expected": {"category": {"Exists": false}, "rating": {"Exists": false}, "id": {"Exists": false}, "color": {"Exists": false}, "seats": {"Exists": false}}, "Item": {"category": {"S": "Sofa"}, "rating": {"S": "4"}, "id": {"S": "first_id"}, "color": {"S": "beige"}, "seats": {"S": "6"}}, "TableName": "items"}
2015-04-15 20:04:49,004 [DEBUG] (boto) Headers: {'Host': 'localhost', 'Content-Type': 'application/x-amz-json-1.0', 'Content-Length': '307', 'X-Amz-Target': 'DynamoDB_20120810.PutItem'}
2015-04-15 20:04:49,005 [DEBUG] (boto) Host: localhost
2015-04-15 20:04:49,005 [DEBUG] (boto) Port: 8000
2015-04-15 20:04:49,005 [DEBUG] (boto) Params: {}
2015-04-15 20:04:49,005 [DEBUG] (boto) Token: None
2015-04-15 20:04:49,005 [DEBUG] (boto) CanonicalRequest:
POST
/
host:localhost
x-amz-date:20150415T143449Z
x-amz-target:DynamoDB_20120810.PutItem
host;x-amz-date;x-amz-target
96fd2aee6eabd2c812d7111c9a47ba21c31ccc86859c963cfa3fd69a18edc957
2015-04-15 20:04:49,005 [DEBUG] (boto) StringToSign:
AWS4-HMAC-SHA256
20150415T143449Z
20150415/localhost/localhost/aws4_request
9ed70485aa9e7036fd2db89e34036c9e24a3c91b6e35dbb7fc2cd476b4766f21
2015-04-15 20:04:49,005 [DEBUG] (boto) Signature:
1d81bae229584b7466c6951a71010c8e2d7a441e80b2e9b5a60d9782859345dc
2015-04-15 20:04:49,005 [DEBUG] (boto) Final headers: {'Content-Length': '307', 'User-Agent': 'Boto/2.38.0 Python/2.7.6 Linux/3.16.0-30-generic', 'Host': 'localhost', 'X-Amz-Date': '20150415T143449Z', 'X-Amz-Target': 'DynamoDB_20120810.PutItem', 'Content-Type': 'application/x-amz-json-1.0', 'Authorization': 'AWS4-HMAC-SHA256 Credential=AKIAJW2Q5MT375WFZIMA/20150415/localhost/localhost/aws4_request,SignedHeaders=host;x-amz-date;x-amz-target,Signature=1d81bae229584b7466c6951a71010c8e2d7a441e80b2e9b5a60d9782859345dc'}
2015-04-15 20:04:49,287 [DEBUG] (boto) Response headers: [('x-amzn-requestid', '80571386-1ce7-4f9b-84fb-6805a0dfa171'), ('content-length', '2'), ('content-type', 'application/x-amz-json-1.0'), ('x-amz-crc32', '2745614147'), ('server', 'Jetty(8.1.12.v20130726)')]
2015-04-15 20:04:49,287 [DEBUG] (boto) Saw HTTP status: 200
2015-04-15 20:04:49,287 [DEBUG] (boto) Validating crc32 checksum for body: {}
2015-04-15 20:04:49,287 [DEBUG] (boto) {}
New item saved
2015-04-15 20:04:49,288 [DEBUG] (boto) Method: POST
2015-04-15 20:04:49,288 [DEBUG] (boto) Path: /
2015-04-15 20:04:49,288 [DEBUG] (boto) Data: {"ConsistentRead": false, "TableName": "items", "Key": {"id": {"S": "first_id"}}}
2015-04-15 20:04:49,288 [DEBUG] (boto) Headers: {'Host': 'localhost', 'Content-Type': 'application/x-amz-json-1.0', 'Content-Length': '81', 'X-Amz-Target': 'DynamoDB_20120810.GetItem'}
2015-04-15 20:04:49,289 [DEBUG] (boto) Host: localhost
2015-04-15 20:04:49,289 [DEBUG] (boto) Port: 8000
2015-04-15 20:04:49,289 [DEBUG] (boto) Params: {}
2015-04-15 20:04:49,289 [DEBUG] (boto) Token: None
2015-04-15 20:04:49,289 [DEBUG] (boto) CanonicalRequest:
POST
/
host:localhost
x-amz-date:20150415T143449Z
x-amz-target:DynamoDB_20120810.GetItem
host;x-amz-date;x-amz-target
1563f0044c8fc746bb9a0ec2e4754e5fd03e62d604102f0745920d8c49481e88
2015-04-15 20:04:49,289 [DEBUG] (boto) StringToSign:
AWS4-HMAC-SHA256
20150415T143449Z
20150415/localhost/localhost/aws4_request
059601773b2e09d4c42f984cb185bf565e47a9dff8d42b3ae15dd61b4fc41f76
2015-04-15 20:04:49,289 [DEBUG] (boto) Signature:
e22cfe8b3e3e03dfa4e05ec11f333f9aaff0edcdbf498ebfa9d0e7dc5b452916
2015-04-15 20:04:49,290 [DEBUG] (boto) Final headers: {'Content-Length': '81', 'User-Agent': 'Boto/2.38.0 Python/2.7.6 Linux/3.16.0-30-generic', 'Host': 'localhost', 'X-Amz-Date': '20150415T143449Z', 'X-Amz-Target': 'DynamoDB_20120810.GetItem', 'Content-Type': 'application/x-amz-json-1.0', 'Authorization': 'AWS4-HMAC-SHA256 Credential=AKIAJW2Q5MT375WFZIMA/20150415/localhost/localhost/aws4_request,SignedHeaders=host;x-amz-date;x-amz-target,Signature=e22cfe8b3e3e03dfa4e05ec11f333f9aaff0edcdbf498ebfa9d0e7dc5b452916'}
2015-04-15 20:04:49,315 [DEBUG] (boto) Response headers: [('x-amzn-requestid', '51547354-f266-4870-8c79-6192e7d7c7b5'), ('content-length', '118'), ('content-type', 'application/x-amz-json-1.0'), ('server', 'Jetty(8.1.12.v20130726)')]
2015-04-15 20:04:49,316 [DEBUG] (boto) Saw HTTP status: 400
2015-04-15 20:04:49,316 [DEBUG] (boto) {"__type":"com.amazon.coral.validate#ValidationException","Message":"The number of conditions on the keys is invalid"}
Traceback (most recent call last):
File "reproduce.py", line 71, in <module>
queried_item = items_table.get_item(id='first_id')
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/table.py", line 705, in get_item
consistent_read=consistent
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 1099, in get_item
body=json.dumps(params))
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2842, in make_request
retry_handler=self._retry_handler)
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/connection.py", line 954, in _mexe
status = retry_handler(response, i, next_sleep)
File "/home/aniket/venv/backend/local/lib/python2.7/site-packages/boto/dynamodb2/layer1.py", line 2882, in _retry_handler
response.status, response.reason, data)
boto.dynamodb2.exceptions.ValidationException: ValidationException: 400 Bad Request
{u'Message': u'The number of conditions on the keys is invalid', u'__type': u'com.amazon.coral.validate#ValidationException'}

OriginalL'auteur czardoz | 2015-04-15

22

GetItem dans DynamoDB besoin du même nombre de conditions essentielles, comme le nombre de touches, en grande partie parce que l'opération doit trouver le point exact de la table. Pour la clé primaire, vous devez fournir tous les attributs. Il devrait y avoir qu'un seul élément, le cas échéant, correspondant à la Obtenir attentes. C'est écrit dans la DynamoDB doc.

Sur le contraste, vous pouvez utiliser Query multiples (peut-être) éléments pour une condition donnée. Puisque vous savez ce que je crois, je pense que vous avez utilisé à tort le tort get_item() api, au lieu de query() ou quelque chose de semblable.

Qui fait sens. Pour une raison quelconque, j'étais sous l'impression que get_item (), utilisez la Requête API interne.

OriginalL'auteur Mingliang Liu

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