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Delete mutation¶
Table of contents
Auto-generated delete mutation schema¶
For example, the auto-generated schema for the delete mutation field for a table article looks like this:
delete_article (
where: article_bool_exp!
): article_mutation_response
# response of any mutation on the table "article"
type article_mutation_response {
# number of affected rows by the mutation
affected_rows: Int!
#data of the affected rows by the mutation
returning: [article!]!
}
As you can see from the schema:
- The
whereargument is compulsory to filter rows to be deleted. See Filter queries for filtering options. Objects can be deleted based on filters on their own fields or those in their nested objects. The{}expression can be used to delete all rows. - You can return the number of affected rows and the affected objects (with nested objects) in the response.
See the delete mutation API reference for the full specifications.
Note
If a table is not in the public Postgres schema, the delete mutation field will be of the format
delete_<schema_name>_<table_name>.
Delete based on an object’s fields¶
Example: Delete all articles rated less than 3:
mutation delete_low_rated_articles {
delete_article(
where: {rating: {_lt: 3}}
) {
affected_rows
}
}
mutation delete_low_rated_articles {
delete_article(
where: {rating: {_lt: 3}}
) {
affected_rows
}
}
{
"data": {
"delete_low_rated_articles": {
"affected_rows": 8
}
}
}
Delete based on a nested object’s fields¶
Example: Delete all articles written by a particular author:
mutation delete_authors_articles {
delete_article(
where: {author: {name: {_eq: "Corny"}}}
) {
affected_rows
}
}
mutation delete_authors_articles {
delete_article(
where: {author: {name: {_eq: "Corny"}}}
) {
affected_rows
}
}
{
"data": {
"delete_authors_articles": {
"affected_rows": 2
}
}
}
Delete all objects¶
You can delete all objects in a table using the {} expression as the where argument. {} basically
evaluates to true for all objects.
Example: Delete all articles:
mutation delete_all_articles {
delete_article (
where: {}
) {
affected_rows
}
}
mutation delete_all_articles {
delete_article (
where: {}
) {
affected_rows
}
}
{
"data": {
"delete_article": {
"affected_rows": 20
}
}
}
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