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 find and delete a document have the same database effect but differ in their return value. This method returns details about the success of the deletion. The method to find and delete a document returns the document that was found and deleted.
|
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 *DeleteResult struct that includes the number of documents that were deleted.
Parameters
Use the DeleteOne method, which belongs to the Collection type.
Method signature
func (c *Collection) DeleteOne(
ctx context.Context,
f CollectionFilter,
opts ...options.CollectionDeleteOneOption
) (*results.DeleteResult, error)| Name | Type | Summary |
|---|---|---|
|
|
The context for the operation. |
|
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 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. |
|
|
Optional.
A builder to generate options for this operation.
See Methods of the |
| Method | Summary |
|---|---|
|
Optional. Sorts documents by one or more fields, or performs a vector search. You must use 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 |
|
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")
// Delete a document
result, err := collection.DeleteOne(ctx, filter.Eq("_id", "101"))
if err != nil {
log.Fatal(err)
}
fmt.Println(result)
}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")
// Delete a document
result, err := collection.DeleteOne(
ctx,
filter.And(
filter.Eq("is_checked_out", false),
filter.Lt("number_of_pages", 300),
),
)
if err != nil {
log.Fatal(err)
}
fmt.Println(result)
}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/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")
// Delete a document
result, err := collection.DeleteOne(
ctx,
filter.F{},
options.CollectionDeleteOne().
SetSort(sort.Vector([]float32{0.08, -0.62, 0.39})),
)
if err != nil {
log.Fatal(err)
}
fmt.Println(result)
}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")
// Delete a document
result, err := collection.DeleteOne(
ctx,
filter.Eq("metadata.language", "English"),
options.CollectionDeleteOne().
SetSort(sort.Asc("rating").Desc("title")),
)
if err != nil {
log.Fatal(err)
}
fmt.Println(result)
}Client reference
For more information, see the client reference.
