Graphql - How to perform where clause - graphql

Question

I am new to graphql and I am struggling with a query.
I want to return a user by their email address
I have a type defined call V1User and it has the following fields
id,
email,
password,
role
What needs to change in this query to return a user based on email?
query GetAllV1User {
viewer {
allV1Users{
edges {
node {
id
email
role
createdAt
modifiedAt
}
}
}
}
}
I tried this query
query getV1UserQuery($email: String!) {
getV1User(email: $email) {
id
email
}
}
With these params
{"email": "test#test.com"}
But get the following errors
{
"errors": [
{
"message": "Unknown argument \"email\" on field \"getV1User\" of type \"Query\".",
"locations": [
{
"line": 2,
"column": 13
}
],
"name": "GraphQLError"
},
{
"message": "Field \"getV1User\" argument \"id\" of type \"ID!\" is required but not provided.",
"locations": [
{
"line": 2,
"column": 3
}
],
"name": "GraphQLError"
}
]
}
My Schema is as follows
Name Type Constraints
id ID NonNull Unique
modifiedAt DateTime NonNull
createdAt DateTime NonNull
role String NonNull
password String NonNull
email String NonNull Unique Indexed
Thanks
Hi
This query solved my issue
query getUserForEmailAddressAndPassword($where: V1UserWhereArgs) {
viewer {
allV1Users(where: $where) {
edges {
node {
email
id
createdAt
password
modifiedAt
role
}
}
}
}
}
Along with these query variables
{"where": {"email": {"eq" : "test#test.com"}, "password": {"eq":"te2st"}}}

Answer 1

You can do so by using the where clause and comparison operators.
https://hasura.io/docs/latest/graphql/core/databases/postgres/queries/query-filters.html#the-where-argument
query {
authors (where: {articles: {rating: {_gt: 4}}}) {
id
name
articles (where: {rating: {_gt: 4}}) {
id
title
rating
}
}
}

Answer 2

I wouldn't recommend using the string "where" in your filter clause. Don't try to emulate SQL. What are you trying to filter using the where clause. If it's an email address then the query in your schema should contain user as the field and email as a parameter to that field.
So the first example that you sent is the right way to do it.
Also, avoid declaring queries using verbs like getUsers or getUser. The schema should just declare the query using nouns
Query
{
Users(email:String):[User!]
}
type User
{
id
email
createdAt
otherStuff
}