Find and delete a document (Go)

Finds a single document in a collection using filter and sort clauses, and then deletes that document.

This method and the method to delete a document have the same database effect but differ in their return value. This method returns the document that was found and deleted. The method to delete a document returns details about the success of the deletion.

Ready to write code? See the examples for this method to get started. If you are new to the Data API, check out the quickstart.

Result

Deletes a document that matches the specified parameters, and returns a *results.SingleResult pointer to a result object that encapsulates the response and any errors.

Call Decode(v any) to unmarshal the document into v. If no document was found, Decode(v any) returns an ErrNoDocuments error.

The fields included in the returned document depend on the projection specified in the method.

Parameters

Use the FindOneAndDelete method, which belongs to the Collection type.

Method signature

func (c *Collection) FindOneAndDelete(
  ctx context.Context,
  f CollectionFilter,
  opts ...options.CollectionFindOneAndDeleteOption
) *results.SingleResult

Name Type Summary

Name	Type	Summary
`ctx`	`context.Context`	The context for the operation.
`f`	`CollectionFilter`	An object that defines filter criteria using the Data API filter syntax. The method only finds documents that match the filter criteria. Filters can improve performance by reducing the number of documents that the Data API processes. You must use `&` to escape any `.` or `&` in field names in the filter clause. You cannot use `&` to escape any other characters. For more information, see Work with `.` and `&` in field names (Go). For a list of available filter operators and more examples, see Filter operators for collections (Go). Filters can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in a filter. For an example, see Delete a document that matches a filter.
`opts`	`…options.CollectionFindOneAndDeleteOption`	Optional. A builder to generate options for this operation. See Methods of the `options.CollectionFindOneAndDeleteOption` builder for more details.

ctx

context.Context

The context for the operation.

f

CollectionFilter

An object that defines filter criteria using the Data API filter syntax. The method only finds documents that match the filter criteria. Filters can improve performance by reducing the number of documents that the Data API processes.

You must use & to escape any . or & in field names in the filter clause. You cannot use & to escape any other characters. For more information, see Work with . and & in field names (Go).

For a list of available filter operators and more examples, see Filter operators for collections (Go).

Filters can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in a filter.

For an example, see Delete a document that matches a filter.

opts

…options.CollectionFindOneAndDeleteOption

Optional. A builder to generate options for this operation. See Methods of the options.CollectionFindOneAndDeleteOption builder for more details.

Methods of the `options.CollectionFindOneAndDeleteOption` builder
Method	Summary
`SetProjection(v map[string]any)`	Optional. Controls which fields are included or excluded in the returned document. You must use `&` to escape any `.` or `&` in field names in the projection clause. You cannot use `&` to escape any other characters. For more information, see Work with `.` and `&` in field names (Go). For more information, see Projections for collections (Go). Default: The default projection for the collection. All fields prefixed with `$` are excluded by default and will only be returned if you include them in the projection. `_id` is included by default and will always be returned unless you exclude it from the projection. For examples, see Include only specific fields in the response and Exclude specific fields from the response.
`SetSort(v sort.Sortable)`	Optional. Sorts documents by one or more fields, or performs a vector search. You must use `&` to escape any `.` or `&` in field names in the sort clause. You cannot use `&` to escape any other characters. For more information, see Work with `.` and `&` in field names (Go). For more information, see Sort clauses for collections (Go). Sort clauses can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in sort queries. For vector searches, this parameter can use `$vector`. For examples, see Delete a document after applying a non-vector sort and Delete a document that is most similar to a search vector.
`UpdateAPIOptions(v …APIOption)`	Optional. General API options for this operation, including the timeout.

Examples

The following examples demonstrate how to delete a document in a collection.

Delete a document by ID

All documents have a unique _id property. You can use a filter to find a document with a specific _id, and then delete that document.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(ctx, filter.Eq("_id", "101")).
		Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Delete a document that matches a filter

You can use a filter to find a document that matches specific criteria. For example, you can find a document with an is_checked_out value of false and a number_of_pages value less than 300.

For a list of available filter operators and more examples, see Filter operators for collections (Go).

Filters can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in a filter.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		filter.And(
			filter.Eq("is_checked_out", false),
			filter.Lt("number_of_pages", 300),
		),
	).Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Delete a document that is most similar to a search vector

To find the document whose $vector value is most similar to a given vector, use a sort with the vector embeddings that you want to match. For more information, see Find data with vector search.

Vector search is only available for vector-enabled collections. For more information, see Create a collection that can store vector embeddings and $vector in collections (Go).

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/options"
	"github.com/datastax/astra-db-go/v2/astra/sort"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		nil,
		options.CollectionFindOneAndDelete().
			SetSort(sort.Vector([]float32{0.08, -0.62, 0.39})),
	).Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Delete a document based on lexicographical matching

Lexicographical matching is currently in public preview. Development is ongoing, and the features and functionality are subject to change. Hyper-Converged Database (HCD), and the use of such, is subject to the DataStax Preview Terms.

There are two ways to use lexicographical matching to find documents with the Data API:

Sort on the $lexical field to find the documents whose $lexical field value is most relevant to a given string of space-separated keywords or terms
Filter on the $lexical field with the $match operator to find the documents whose $lexical field value is a lexicographical match to the specified string of space-separated keywords or terms

You can use these strategies together or separately.

You can only use lexicographical matching on collections that have lexical enabled. For more information, see Create a collection that supports lexicographical matching.

Documents must have the $lexical field populated to be included in lexicographical matching. For examples, see Insert a document for retrieval with lexicographical matching and Insert documents for retrieval with lexicographical matching.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
	"github.com/datastax/astra-db-go/v2/astra/sort"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
			"USERNAME",
			"PASSWORD",
		).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find and delete a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		filter.Coll.LexicalMatch("tree hill"),
		options.CollectionFindOneAndDelete().
			SetSort(sort.Lexical("tree hill grassy")),
	).Decode(&result)

	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Delete a document after applying a non-vector sort

You can use a sort clause to sort documents by one or more fields.

For more information, see Sort clauses for collections (Go).

Sort clauses can use only indexed fields. If you apply selective indexing when you create a collection, you cannot reference non-indexed fields in sort queries.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
	"github.com/datastax/astra-db-go/v2/astra/sort"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		filter.Eq("metadata.language", "English"),
		options.CollectionFindOneAndDelete().
			SetSort(sort.Asc("rating").Desc("title")),
	).Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Include only specific fields in the response

To specify which fields to include or exclude in the returned document, use a projection.

All fields prefixed with $ are excluded by default and will only be returned if you include them in the projection. _id is included by default and will always be returned unless you exclude it from the projection.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		filter.Eq("metadata.language", "English"),
		options.CollectionFindOneAndDelete().SetProjection(map[string]any{
			"is_checked_out": true,
			"title":          true,
		}),
	).Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Exclude specific fields from the response

To specify which fields to include or exclude in the returned document, use a projection.

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/datastax/astra-db-go/v2/astra"
	"github.com/datastax/astra-db-go/v2/astra/filter"
	"github.com/datastax/astra-db-go/v2/astra/options"
)

func main() {
	ctx := context.Background()

	// Get an existing collection
	client := astra.NewClient(
		options.API().SetEnvironment(options.EnvironmentHCD),
	)

	database := client.Database(
		"API_ENDPOINT",
		options.API().
			SetUsernamePasswordTokenProvider(
				"USERNAME",
				"PASSWORD",
			).
			SetKeyspace("KEYSPACE_NAME"),
	)

	collection := database.Collection("COLLECTION_NAME")

	// Find a document
	var result astra.Document
	err := collection.FindOneAndDelete(
		ctx,
		filter.Eq("metadata.language", "English"),
		options.CollectionFindOneAndDelete().SetProjection(map[string]any{
			"is_checked_out": false,
			"title":          false,
		}),
	).Decode(&result)
	if err != nil {
		log.Fatal(err)
	}

	fmt.Println(result.ToMap())
}

Client reference

For more information, see the client reference.

Find and delete a document (Go)

Result

Parameters

Examples

Delete a document by ID

Delete a document that matches a filter

Delete a document that is most similar to a search vector

Delete a document based on lexicographical matching

Delete a document after applying a non-vector sort

Include only specific fields in the response

Exclude specific fields from the response

Client reference

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