Update​

Updating properties​

To explicitly unset a property that is not required, set it to an empty set.

update Person filter .id = <uuid>$id set { middle_name := {} };

Updating links​

When updating links, the := operator will replace the set of linked values.

db> 
... 
... 
... 
... 
... 
... 
... 

update movie
filter .title = "Black Widow"
set {
 characters := (
  select Person
  filter .name in { "Black Widow", "Yelena", "Dreykov" }
 )
};

{default::Title {id: af706c7c-3e98-11ec-abb3-4bbf3f18a61a}}

db> 
... 

select Movie { num_characters := count(.characters) }
filter .title = "Black Widow";

{default::Movie {num_characters: 3}}

To add additional linked items, use the += operator.

db> 
... 
... 
... 
... 

update Movie
filter .title = "Black Widow"
set {
 characters += (insert Villain {name := "Taskmaster"})
};

{default::Title {id: af706c7c-3e98-11ec-abb3-4bbf3f18a61a}}

db> 
... 

select Movie { num_characters := count(.characters) }
filter .title = "Black Widow";

{default::Movie {num_characters: 4}}

To remove items, use -=.

db> 
... 
... 
... 
... 

update Movie
filter .title = "Black Widow"
set {
 characters -= Villain # remove all villains
};

{default::Title {id: af706c7c-3e98-11ec-abb3-4bbf3f18a61a}}

db> 
... 

select Movie { num_characters := count(.characters) }
filter .title = "Black Widow";

{default::Movie {num_characters: 2}}

Returning data on update​

By default, update returns only the inserted object's id as seen in the examples above. If you want to get additional data back, you may wrap your update with a select and apply a shape specifying any properties and links you want returned:

db> 
... 
... 
... 

select (update Hero
  filter .name = "Hawkeye"
  set { name := "Ronin" }
) {id, name};

{
  default::Hero {
    id: d476b12e-3e7b-11ec-af13-2717f3dc1d8a,
    name: "Ronin"
  }
}

With blocks​

All top-level EdgeQL statements (select, insert, update, and delete) can be prefixed with a with block. This is useful for updating the results of a complex query.

db> 
... 
... 
... 
... 
... 
... 
... 

with people := (
    select Person
    order by .name
    offset 3
    limit 3
  )
update people
set { name := str_trim(.name) };

{
  default::Hero {id: d4764c66-3e7b-11ec-af13-df1ba5b91187},
  default::Hero {id: d7d7e0f6-40ae-11ec-87b1-3f06bed494b9},
  default::Villain {id: d477a836-3e7b-11ec-af13-4fea611d1c31},
}

You can also use with to make returning additional data from an update more readable:

db> 
... 
... 
... 
... 
... 
... 
... 

with UpdatedHero := (update Hero
  filter .name = "Hawkeye"
  set { name := "Ronin" }
)
select UpdatedHero {
  id,
  name
};

{
  default::Hero {
    id: d476b12e-3e7b-11ec-af13-2717f3dc1d8a,
    name: "Ronin"
  }
}

See also​

For documentation on performing upsert operations, see EdgeQL > Insert > Upserts.