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  3. Dynamodb2 Table.get_item() throws Validation

Dynamodb2 Table.get_item() throws Validation

2015-04-15 9 views
9

„Die Zahl der Bedingungen auf den Tasten ist ungültig“ Ich bin nur eine einfache Aufgabe in DynamoDB tun:Dynamodb2 Table.get_item() throws Validation

  1. eine Tabelle erstellen,
  2. ein Element hinzufügen, um es
  3. Fragen Sie die Tabelle für diesen Artikel ab.

Hier ist ein Skript, das ich verwende:

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 --------

Wenn ich dieses Skript ausführen, bekomme ich ein 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'}

Ich bin ziemlich sicher, dass ich etwas falsch mache, aber Ich kann nicht herausfinden, was. Die DynamoDB Docs erwähnen, dass es möglich ist, den HashKey unter Verwendung nur abzufragen, so scheint das, was ich tue, ziemlich normal zu sein.

Falls es hilft, die Debug-Protokollierung auch hinzugefügt, und hier ist die Ausgabe:

(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'}

Quelle

2015-04-15 czardoz

Antwort

14

GetItem in DynamoDB die gleiche Anzahl von Schlüsselbedingungen wie die Anzahl der Tasten benötigt, vor allem, weil der Betrieb die finden müssen genaues Element in der Tabelle. Für den Primärschlüssel müssen Sie alle Attribute angeben. Es sollte nur einen Artikel geben, der mit den Get Erwartungen übereinstimmt. Dies ist in der DynamoDB doc geschrieben. Im Gegensatz dazu können Sie Query verwenden, um mehrere (möglicherweise) Elemente für eine bestimmte Bedingung zu erhalten Da Sie das wissen, glaube ich, ich glaube, Sie versehentlich das falsche get_item() API anstelle von query() oder etwas ähnliches verwendet.

Quelle

2015-04-16 01:20:41

+0

Das macht Sinn. Aus irgendeinem Grund hatte ich den Eindruck, dass get_item() die Query API intern verwenden wird. – czardoz

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