[ aws . appsync ]

create-resolver

Description

Creates a Resolver object.

A resolver converts incoming requests into a format that a data source can understand, and converts the data source’s responses into GraphQL.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

Synopsis

  create-resolver
--api-id <value>
--type-name <value>
--field-name <value>
[--data-source-name <value>]
[--request-mapping-template <value>]
[--response-mapping-template <value>]
[--kind <value>]
[--pipeline-config <value>]
[--sync-config <value>]
[--caching-config <value>]
[--max-batch-size <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options

--api-id (string)

The ID for the GraphQL API for which the resolver is being created.

--type-name (string)

The name of the Type .

--field-name (string)

The name of the field to attach the resolver to.

--data-source-name (string)

The name of the data source for which the resolver is being created.

--request-mapping-template (string)

The mapping template to use for requests.

A resolver uses a request mapping template to convert a GraphQL expression into a format that a data source can understand. Mapping templates are written in Apache Velocity Template Language (VTL).

VTL request mapping templates are optional when using an Lambda data source. For all other data sources, VTL request and response mapping templates are required.

--response-mapping-template (string)

The mapping template to use for responses from the data source.

--kind (string)

The resolver type.

• UNIT : A UNIT resolver type. A UNIT resolver is the default resolver type. You can use a UNIT resolver to run a GraphQL query against a single data source.

• PIPELINE : A PIPELINE resolver type. You can use a PIPELINE resolver to invoke a series of Function objects in a serial manner. You can use a pipeline resolver to run a GraphQL query against multiple data sources.

Possible values:

• UNIT

• PIPELINE

--pipeline-config (structure)

The PipelineConfig .

functions -> (list)

A list of Function objects.

(string)

Shorthand Syntax:

functions=string,string

JSON Syntax:

{
  "functions": ["string", ...]
}

--sync-config (structure)

The SyncConfig for a resolver attached to a versioned data source.

conflictHandler -> (string)

The Conflict Resolution strategy to perform in the event of a conflict.

• OPTIMISTIC_CONCURRENCY : Resolve conflicts by rejecting mutations when versions don’t match the latest version at the server.

• AUTOMERGE : Resolve conflicts with the Automerge conflict resolution strategy.

• LAMBDA : Resolve conflicts with an Lambda function supplied in the LambdaConflictHandlerConfig .

conflictDetection -> (string)

The Conflict Detection strategy to use.

• VERSION : Detect conflicts based on object versions for this resolver.

• NONE : Do not detect conflicts when invoking this resolver.

lambdaConflictHandlerConfig -> (structure)

The LambdaConflictHandlerConfig when configuring LAMBDA as the Conflict Handler.

lambdaConflictHandlerArn -> (string)

The Amazon Resource Name (ARN) for the Lambda function to use as the Conflict Handler.

Shorthand Syntax:

conflictHandler=string,conflictDetection=string,lambdaConflictHandlerConfig={lambdaConflictHandlerArn=string}

JSON Syntax:

{
  "conflictHandler": "OPTIMISTIC_CONCURRENCY"|"LAMBDA"|"AUTOMERGE"|"NONE",
  "conflictDetection": "VERSION"|"NONE",
  "lambdaConflictHandlerConfig": {
    "lambdaConflictHandlerArn": "string"
  }
}

--caching-config (structure)

The caching configuration for the resolver.

ttl -> (long)

The TTL in seconds for a resolver that has caching activated.

Valid values are 1–3,600 seconds.

cachingKeys -> (list)

The caching keys for a resolver that has caching activated.

Valid values are entries from the $context.arguments , $context.source , and $context.identity maps.

(string)

Shorthand Syntax:

ttl=long,cachingKeys=string,string

JSON Syntax:

{
  "ttl": long,
  "cachingKeys": ["string", ...]
}

--max-batch-size (integer)

The maximum batching size for a resolver.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Output

resolver -> (structure)

The Resolver object.

typeName -> (string)

The resolver type name.

fieldName -> (string)

The resolver field name.

dataSourceName -> (string)

The resolver data source name.

resolverArn -> (string)

The resolver Amazon Resource Name (ARN).

requestMappingTemplate -> (string)

The request mapping template.

responseMappingTemplate -> (string)

The response mapping template.

kind -> (string)

The resolver type.

• UNIT : A UNIT resolver type. A UNIT resolver is the default resolver type. You can use a UNIT resolver to run a GraphQL query against a single data source.

• PIPELINE : A PIPELINE resolver type. You can use a PIPELINE resolver to invoke a series of Function objects in a serial manner. You can use a pipeline resolver to run a GraphQL query against multiple data sources.

pipelineConfig -> (structure)

The PipelineConfig .

functions -> (list)

A list of Function objects.

(string)

syncConfig -> (structure)

The SyncConfig for a resolver attached to a versioned data source.

conflictHandler -> (string)

The Conflict Resolution strategy to perform in the event of a conflict.

• OPTIMISTIC_CONCURRENCY : Resolve conflicts by rejecting mutations when versions don’t match the latest version at the server.

• AUTOMERGE : Resolve conflicts with the Automerge conflict resolution strategy.

• LAMBDA : Resolve conflicts with an Lambda function supplied in the LambdaConflictHandlerConfig .

conflictDetection -> (string)

The Conflict Detection strategy to use.

• VERSION : Detect conflicts based on object versions for this resolver.

• NONE : Do not detect conflicts when invoking this resolver.

lambdaConflictHandlerConfig -> (structure)

The LambdaConflictHandlerConfig when configuring LAMBDA as the Conflict Handler.

lambdaConflictHandlerArn -> (string)

The Amazon Resource Name (ARN) for the Lambda function to use as the Conflict Handler.

cachingConfig -> (structure)

The caching configuration for the resolver.

ttl -> (long)

The TTL in seconds for a resolver that has caching activated.

Valid values are 1–3,600 seconds.

cachingKeys -> (list)

The caching keys for a resolver that has caching activated.

Valid values are entries from the $context.arguments , $context.source , and $context.identity maps.

(string)

maxBatchSize -> (integer)

The maximum batching size for a resolver.