fuzzysearch.md

Enable Fuzzy Query

Update schema.graphql

• Update Query type

  type Query {
      fuzzySearch(
          keyword: String!
          limit: Int
          nextToken: String
      ): FuzzyObjectConnection
  }
  

• Add custom fuzzy query type

  type FuzzyObjectConnection {
  items: [Collection]
  nextToken: String
  total: Int
  } 
  

Create custom resolver template for fuzzy query

• Query.fuzzySearch.req.vtl

  #set( $indexPath = "/collection/doc/_search" )
  {
      "version": "2017-02-28",
      "operation": "GET",
      "path": "$indexPath.toLowerCase()",
      "params": {
          "body": {
              "query": {
                  "match" : {
                      "title" : {
                          "query" : $util.toJson($ctx.args.keyword),
                          "fuzziness": "AUTO"
                      }
                  }
              }
          }
      }
  } 
  

• Query.fuzzySearch.res.vtl

  #set( $items = [] )
  #foreach( $entry in $context.result.hits.hits )
      #if( !$foreach.hasNext )
          #set( $nextToken = "$entry.sort.get(0)" )
      #end
      $util.qr($items.add($entry.get("_source")))
  #end
  $util.toJson({
      "items": $items,
      "total": $ctx.result.hits.total,
      "nextToken": $nextToken
  }) 
  

Add new resolvers resource in custom stack

```
"QueryFuzzySearchResolver": {
    "Type": "AWS::AppSync::Resolver",
    "Properties": {
        "ApiId": {
            "Ref": "AppSyncApiId"
        },
        "DataSourceName": "ElasticSearchDomain",
        "TypeName": "Query",
        "FieldName": "fuzzySearch",
        "RequestMappingTemplateS3Location": {
            "Fn::Sub": [
                "s3://${S3DeploymentBucket}/${S3DeploymentRootKey}/resolvers/Query.fuzzySearch.req.vtl",
                {
                    "S3DeploymentBucket": {
                        "Ref": "S3DeploymentBucket"
                    },
                    "S3DeploymentRootKey": {
                        "Ref": "S3DeploymentRootKey"
                    }
                }
            ]
        },
        "ResponseMappingTemplateS3Location": {
            "Fn::Sub": [
                "s3://${S3DeploymentBucket}/${S3DeploymentRootKey}/resolvers/Query.fuzzySearch.res.vtl",
                {
                    "S3DeploymentBucket": {
                        "Ref": "S3DeploymentBucket"
                    },
                    "S3DeploymentRootKey": {
                        "Ref": "S3DeploymentRootKey"
                    }
                }
            ]
        }
    }
}
```