GraphQL: Querying for a value from another table from a mutation - graphql

Question

Let's say I have a table t1 that is foreign key'd to another table t2. For simplicity, t2 only has columns 'name' and 'id' which are both unique. I store the id in t1.
My problem is I want to write a mutation where I know the name but I don't know the id when I go to store something in t1. Is there a way to query inside of my mutation so that it converts the value in my statement?
Perhaps a plugin I can add to my project?
I end up with something like this where I pass in a known name but I want to store the id
mutation addT1(
$knownT2Name: String!,
) {
createT1 (
input: {
t1: {
id: $component
# Is there a way to convert this to the id inside the query
# Or do I need to query for the id with the name first then pass that in?
t2_id: $knownT2Name
}
}
) {
t1 {
id
t2_id
}
}
}
This is a simple example. The reason I don't want to query for the id with the name is in actuality t1 is foreign key'd to a myriad of other tables with the same situation and I don't want to do 9+ queries just to convert each string to an integer id.
I would much rather be able to do something like this:
mutation addT1(
$knownT2Name: String!,
) {
createT1 (
input: {
t1: {
id: $component
t2_id: t2Byt2(name: $knownT2Name) { id }
}
}
) {
t1 {
id
t2_id
}
}
}
Where t2Byt2(name: $knownT2Name) { id } would be a sub-query that passes the name and gets the id, then stores the id in 't2_id'
I'm looking at a nested mutations plugin for postgraphile (Here's the GitHub)but I haven't had any traction. It's not quite what I'm looking for.

Answer 1

For the simple relationship I believe you want something like: (using the nested mutations plugin). This only works on CREATE. No luck with an UPSERT.
mutation addT1($t1Name: String!, $t2Name: String!) {
createT1(
input: {
T1: {
name: $t1Name,
t2ToT2: { connectByT2: { name: $t2Name } }
}
}
) {
t1 {
t1Id
name
t2ByT2 {
name
}
}
}
}