Check for empty arrays in Hasura

Question

I have the following Query:

query {
  table1(where: {table2: {id: {}}}) {
    id
  }
}

There is a relationship between table1 and table2 via a foreign key. That is, in table2 I have a column named table1_id and so I can access table2 from table1. I want to query all rows from table1 that have no related rows in table2. That is, if I do the following query:

query {
  table1 {
    table2 {
      id
    }
  }
}

I want the rows in table1 where this query returns an empty array. I have tried the following:

query {
  table1(where: {table2: {id: {_in: []}}}) {
    id
  }
}

And

query {
  table1(where: {table2: {id: {_is_null: true}}}) {
    id
  }
}

But nothing seems to work (I get back an empty array). What am I doing wrong?

Leonardo Alves · Accepted Answer · 2021-01-08T16:38:57.907

12

query {
  table1(where: {_not: { table2: {} } }) {
    id
  }
}

Should work to return the records from table1 that don't have a relationship with table2

edited Jan 08 '21 at 16:38

answered Jul 11 '20 at 23:21

Leonardo Alves

1,876
1
16
19

smbl · Answer 2 · 2021-01-08T17:36:03.083

2

The selected answer is actually incorrect. It should be the following:

query {
  table1(where: {_not: { table2: {} } }) {
    id
  }
}

Edit: The selected answer is good now :)

edited Jan 08 '21 at 17:36

answered Jan 05 '21 at 09:49

smbl

314
3
13

2

I edited my answer to avoid any confusion. Thanks – Leonardo Alves Jan 08 '21 at 16:39
2

@LeonardoAlves Ah great. I didn't have permission to edit your answer so had to make a separate answer. I reverted the downvote to an upvote! – smbl Jan 08 '21 at 17:35

Check for empty arrays in Hasura

2 Answers2