Class: Aws::DynamoDB::Resource
- Inherits:
-
Object
- Object
- Aws::DynamoDB::Resource
- Defined in:
- lib/aws-sdk-dynamodb/resource.rb
Actions collapse
- #batch_get_item(options = {}) ⇒ Types::BatchGetItemOutput
- #batch_write_item(options = {}) ⇒ Types::BatchWriteItemOutput
- #create_table(options = {}) ⇒ Table
Associations collapse
Instance Method Summary collapse
- #client ⇒ Client
-
#initialize(options = {}) ⇒ Resource
constructor
A new instance of Resource.
Constructor Details
Instance Method Details
#batch_get_item(options = {}) ⇒ Types::BatchGetItemOutput
Examples:
Request syntax with placeholder values
Request syntax with placeholder values
dynamo_db.batch_get_item({
request_items: { # required
"TableName" => {
keys: [ # required
{
"AttributeName" => "value", # value <Hash,Array,String,Numeric,Boolean,IO,Set,nil>
},
],
attributes_to_get: ["AttributeName"],
consistent_read: false,
projection_expression: "ProjectionExpression",
expression_attribute_names: {
"ExpressionAttributeNameVariable" => "AttributeName",
},
},
},
return_consumed_capacity: "INDEXES", # accepts INDEXES, TOTAL, NONE
})
Parameters:
-
options
(Hash)
(defaults to: {})
—
({})
Options Hash (options):
-
:request_items
(required, Hash<String,Types::KeysAndAttributes>)
—
A map of one or more table names and, for each table, a map that describes one or more items to retrieve from that table. Each table name can be used only once per ‘BatchGetItem` request.
Each element in the map of items to retrieve consists of the following:
-
‘ConsistentRead` - If `true`, a strongly consistent read is used; if `false` (the default), an eventually consistent read is used.
-
‘ExpressionAttributeNames` - One or more substitution tokens for attribute names in the `ProjectionExpression` parameter. The following are some use cases for using `ExpressionAttributeNames`:
-
To access an attribute whose name conflicts with a DynamoDB reserved word.
-
To create a placeholder for repeating occurrences of an attribute name in an expression.
-
To prevent special characters in an attribute name from being misinterpreted in an expression.
Use the **#** character in an expression to dereference an attribute name. For example, consider the following attribute name:
-
‘Percentile`
^
The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see [Reserved Words] in the *Amazon DynamoDB Developer Guide*). To work around this, you could specify the following for ‘ExpressionAttributeNames`:
-
‘“#P”:“Percentile”`
^
You could then use this substitution in an expression, as in this example:
-
‘#P = :val`
^
<note markdown=“1”> Tokens that begin with the : character are *expression attribute values*, which are placeholders for the actual value at runtime.
</note>
For more information on expression attribute names, see [Accessing Item Attributes] in the *Amazon DynamoDB Developer Guide*.
-
-
‘Keys` - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide the partition key value. For a composite key, you must provide both the partition key value and the sort key value.
-
‘ProjectionExpression` - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see [Accessing Item Attributes] in the *Amazon DynamoDB Developer Guide*.
-
‘AttributesToGet` - This is a legacy parameter. Use `ProjectionExpression` instead. For more information, see
- AttributesToGet][3
-
in the *Amazon DynamoDB Developer Guide*.
[1]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html [2]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html [3]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.AttributesToGet.html
-
-
:return_consumed_capacity
(String)
—
Determines the level of detail about provisioned throughput consumption that is returned in the response:
-
‘INDEXES` - The response includes the aggregate `ConsumedCapacity` for the operation, together with `ConsumedCapacity` for each table and secondary index that was accessed.
Note that some operations, such as ‘GetItem` and `BatchGetItem`, do not access any indexes at all. In these cases, specifying `INDEXES` will only return `ConsumedCapacity` information for table(s).
-
‘TOTAL` - The response includes only the aggregate `ConsumedCapacity` for the operation.
-
‘NONE` - No `ConsumedCapacity` details are included in the response.
-
Returns:
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 147 def batch_get_item(options = {}) resp = @client.batch_get_item(options) resp.data end |
#batch_write_item(options = {}) ⇒ Types::BatchWriteItemOutput
Examples:
Request syntax with placeholder values
Request syntax with placeholder values
dynamo_db.batch_write_item({
request_items: { # required
"TableName" => [
{
put_request: {
item: { # required
"AttributeName" => "value", # value <Hash,Array,String,Numeric,Boolean,IO,Set,nil>
},
},
delete_request: {
key: { # required
"AttributeName" => "value", # value <Hash,Array,String,Numeric,Boolean,IO,Set,nil>
},
},
},
],
},
return_consumed_capacity: "INDEXES", # accepts INDEXES, TOTAL, NONE
return_item_collection_metrics: "SIZE", # accepts SIZE, NONE
})
Parameters:
-
options
(Hash)
(defaults to: {})
—
({})
Options Hash (options):
-
:request_items
(required, Hash<String,Array>)
—
A map of one or more table names and, for each table, a list of operations to be performed (‘DeleteRequest` or `PutRequest`). Each element in the map consists of the following:
-
‘DeleteRequest` - Perform a `DeleteItem` operation on the specified item. The item to be deleted is identified by a `Key` subelement:
-
‘Key` - A map of primary key attribute values that uniquely identify the item. Each entry in this map consists of an attribute name and an attribute value. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
^
-
-
‘PutRequest` - Perform a `PutItem` operation on the specified item. The item to be put is identified by an `Item` subelement:
-
‘Item` - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a `ValidationException` exception.
If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table’s attribute definition.
-
-
-
:return_consumed_capacity
(String)
—
Determines the level of detail about provisioned throughput consumption that is returned in the response:
-
‘INDEXES` - The response includes the aggregate `ConsumedCapacity` for the operation, together with `ConsumedCapacity` for each table and secondary index that was accessed.
Note that some operations, such as ‘GetItem` and `BatchGetItem`, do not access any indexes at all. In these cases, specifying `INDEXES` will only return `ConsumedCapacity` information for table(s).
-
‘TOTAL` - The response includes only the aggregate `ConsumedCapacity` for the operation.
-
‘NONE` - No `ConsumedCapacity` details are included in the response.
-
-
:return_item_collection_metrics
(String)
—
Determines whether item collection metrics are returned. If set to ‘SIZE`, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to `NONE` (the default), no statistics are returned.
Returns:
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 228 def batch_write_item(options = {}) resp = @client.batch_write_item(options) resp.data end |
#client ⇒ Client
Returns:
- (Client)
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 18 def client @client end |
#create_table(options = {}) ⇒ Table
Examples:
Request syntax with placeholder values
Request syntax with placeholder values
table = dynamo_db.create_table({
attribute_definitions: [ # required
{
attribute_name: "KeySchemaAttributeName", # required
attribute_type: "S", # required, accepts S, N, B
},
],
table_name: "TableName", # required
key_schema: [ # required
{
attribute_name: "KeySchemaAttributeName", # required
key_type: "HASH", # required, accepts HASH, RANGE
},
],
local_secondary_indexes: [
{
index_name: "IndexName", # required
key_schema: [ # required
{
attribute_name: "KeySchemaAttributeName", # required
key_type: "HASH", # required, accepts HASH, RANGE
},
],
projection: { # required
projection_type: "ALL", # accepts ALL, KEYS_ONLY, INCLUDE
non_key_attributes: ["NonKeyAttributeName"],
},
},
],
global_secondary_indexes: [
{
index_name: "IndexName", # required
key_schema: [ # required
{
attribute_name: "KeySchemaAttributeName", # required
key_type: "HASH", # required, accepts HASH, RANGE
},
],
projection: { # required
projection_type: "ALL", # accepts ALL, KEYS_ONLY, INCLUDE
non_key_attributes: ["NonKeyAttributeName"],
},
provisioned_throughput: { # required
read_capacity_units: 1, # required
write_capacity_units: 1, # required
},
},
],
provisioned_throughput: { # required
read_capacity_units: 1, # required
write_capacity_units: 1, # required
},
stream_specification: {
stream_enabled: false,
stream_view_type: "NEW_IMAGE", # accepts NEW_IMAGE, OLD_IMAGE, NEW_AND_OLD_IMAGES, KEYS_ONLY
},
})
Parameters:
-
options
(Hash)
(defaults to: {})
—
({})
Options Hash (options):
-
:attribute_definitions
(required, Array<Types::AttributeDefinition>)
—
An array of attributes that describe the key schema for the table and indexes.
-
:table_name
(required, String)
—
The name of the table to create.
-
:key_schema
(required, Array<Types::KeySchemaElement>)
—
Specifies the attributes that make up the primary key for a table or an index. The attributes in ‘KeySchema` must also be defined in the `AttributeDefinitions` array. For more information, see [Data Model] in the *Amazon DynamoDB Developer Guide*.
Each ‘KeySchemaElement` in the array is composed of:
-
‘AttributeName` - The name of this key attribute.
-
‘KeyType` - The role that the key attribute will assume:
-
‘HASH` - partition key
-
‘RANGE` - sort key
-
<note markdown=“1”> The partition key of an item is also known as its *hash attribute*. The term “hash attribute” derives from DynamoDB’ usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
The sort key of an item is also known as its *range attribute*. The
term “range attribute” derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
</note>
For a simple primary key (partition key), you must provide exactly one element with a ‘KeyType` of `HASH`.
For a composite primary key (partition key and sort key), you must provide exactly two elements, in this order: The first element must have a ‘KeyType` of `HASH`, and the second element must have a `KeyType` of `RANGE`.
For more information, see [Specifying the Primary Key] in the *Amazon DynamoDB Developer Guide*.
[1]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/DataModel.html [2]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithTables.html#WorkingWithTables.primary.key
-
-
:local_secondary_indexes
(Array<Types::LocalSecondaryIndex>)
—
One or more local secondary indexes (the maximum is five) to be created on the table. Each index is scoped to a given partition key value. There is a 10 GB size limit per partition key value; otherwise, the size of a local secondary index is unconstrained.
Each local secondary index in the array includes the following:
-
‘IndexName` - The name of the local secondary index. Must be unique only for this table.
-
‘KeySchema` - Specifies the key schema for the local secondary index. The key schema must begin with the same partition key as the table.
-
‘Projection` - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
-
‘ProjectionType` - One of the following:
-
‘KEYS_ONLY` - Only the index and primary keys are projected into the index.
-
‘INCLUDE` - Only the specified table attributes are projected into the index. The list of projected attributes are in `NonKeyAttributes`.
-
‘ALL` - All of the table attributes are projected into the index.
-
-
‘NonKeyAttributes` - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in `NonKeyAttributes`, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
-
-
-
:global_secondary_indexes
(Array<Types::GlobalSecondaryIndex>)
—
One or more global secondary indexes (the maximum is five) to be created on the table. Each global secondary index in the array includes the following:
-
‘IndexName` - The name of the global secondary index. Must be unique only for this table.
-
‘KeySchema` - Specifies the key schema for the global secondary index.
-
‘Projection` - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
-
‘ProjectionType` - One of the following:
-
‘KEYS_ONLY` - Only the index and primary keys are projected into the index.
-
‘INCLUDE` - Only the specified table attributes are projected into the index. The list of projected attributes are in `NonKeyAttributes`.
-
‘ALL` - All of the table attributes are projected into the index.
-
-
‘NonKeyAttributes` - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in `NonKeyAttributes`, summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
-
-
‘ProvisionedThroughput` - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units.
-
-
:provisioned_throughput
(required, Types::ProvisionedThroughput)
—
Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the ‘UpdateTable` operation.
For current minimum and maximum provisioned throughput values, see
- Limits][1
-
in the *Amazon DynamoDB Developer Guide*.
[1]: docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html
-
:stream_specification
(Types::StreamSpecification)
—
The settings for DynamoDB Streams on the table. These settings consist of:
-
‘StreamEnabled` - Indicates whether Streams is to be enabled (true) or disabled (false).
-
‘StreamViewType` - When an item in the table is modified, `StreamViewType` determines what information is written to the table’s stream. Valid values for ‘StreamViewType` are:
-
‘KEYS_ONLY` - Only the key attributes of the modified item are written to the stream.
-
‘NEW_IMAGE` - The entire item, as it appears after it was modified, is written to the stream.
-
‘OLD_IMAGE` - The entire item, as it appeared before it was modified, is written to the stream.
-
‘NEW_AND_OLD_IMAGES` - Both the new and the old item images of the item are written to the stream.
-
-
Returns:
- (Table)
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 455 def create_table(options = {}) resp = @client.create_table(options) Table.new( name: resp.data.table_description.table_name, data: resp.data.table_description, client: @client ) end |
#table(name) ⇒ Table
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 468 def table(name) Table.new( name: name, client: @client ) end |
#tables(options = {}) ⇒ Table::Collection
Examples:
Request syntax with placeholder values
Request syntax with placeholder values
dynamo_db.tables()
Parameters:
-
options
(Hash)
(defaults to: {})
—
({})
Returns:
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# File 'lib/aws-sdk-dynamodb/resource.rb', line 480 def tables(options = {}) batches = Enumerator.new do |y| resp = @client.list_tables(options) resp.each_page do |page| batch = [] page.data.table_names.each do |t| batch << Table.new( name: t, client: @client ) end y.yield(batch) end end Table::Collection.new(batches) end |