Meteor Apollo GraphQL Interfaces: return an array of object and invoking resolver in another resolver
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I'm having some issues with GraphQl interfaces. Let take the example in the doc:
interface Vehicle {
maxSpeed: Int
}
type Airplane implements Vehicle {
maxSpeed: Int
wingspan: Int
}
type Car implements Vehicle {
maxSpeed: Int
licensePlate: String
}
type Query {
vehicle: Vehicle
}
const resolvers = {
Vehicle: {
__resolveType(obj, context, info){
if(obj.wingspan){
return 'Airplane';
}
if(obj.licensePlate){
return 'Car';
}
return null;
},
},
Query: {
vehicle: () => {
// Query Airplane and Car an merge in one single array.
}
},
};
Background: I create 2 different DBs for each interfaces implementation: one for Car and one for Airplane. But I did not create a DB for Vehicle since it just an interface that does not keep data in itself. (I hope this is fine)
The first problem is how to access Car and Airplane resolvers to query their respective DBs in the Vehicle resolver? So in Query.vehicle(), I would like to just call the resolver defined for fetching all cars to get all cars and call the one for fetching airplanes to get all airplanes in the DB. (note using Car.find().fetch() is not always effective because before doing the query, lots of other query needs to be done also avoid code duplication).
The Second problem is that in the example, obj.wingspan assume that obj should be an object. So returning an array from Query.vehicle(), won't help because this query is used in Vehicle.__resolveType. So from what I've experienced with GraphQl interfaces, it only returns a single object from the query.
My aim is to obtain with the with the following query:
{
vehicle {
maxSpeed
... on Car {
licensePlate
}
... on Airplane {
wingspan
}
}
}
the following result:
{
"data": {
"car": [
{
"maxSpeed": 200,
"licensePlate": 1.8
},
{
"maxSpeed": 120,
"licensePlate": "String"
},
...
],
"Airplane": [
{
"maxSpeed": 500,
"wingspan": "String"
},
{
"maxSpeed": 700,
"wingspan": 1.5
},
...
]
}
}
meteor graphql apollo apollo-client apollo-server
asked Nov 10 at 23:33
danyhiol
100113
add a comment |
up vote
0
down vote
favorite
I'm having some issues with GraphQl interfaces. Let take the example in the doc:
interface Vehicle {
maxSpeed: Int
}
type Airplane implements Vehicle {
maxSpeed: Int
wingspan: Int
}
type Car implements Vehicle {
maxSpeed: Int
licensePlate: String
}
type Query {
vehicle: Vehicle
}
const resolvers = {
Vehicle: {
__resolveType(obj, context, info){
if(obj.wingspan){
return 'Airplane';
}
if(obj.licensePlate){
return 'Car';
}
return null;
},
},
Query: {
vehicle: () => {
// Query Airplane and Car an merge in one single array.
}
},
};
Background: I create 2 different DBs for each interfaces implementation: one for Car and one for Airplane. But I did not create a DB for Vehicle since it just an interface that does not keep data in itself. (I hope this is fine)
The first problem is how to access Car and Airplane resolvers to query their respective DBs in the Vehicle resolver? So in Query.vehicle(), I would like to just call the resolver defined for fetching all cars to get all cars and call the one for fetching airplanes to get all airplanes in the DB. (note using Car.find().fetch() is not always effective because before doing the query, lots of other query needs to be done also avoid code duplication).
The Second problem is that in the example, obj.wingspan assume that obj should be an object. So returning an array from Query.vehicle(), won't help because this query is used in Vehicle.__resolveType. So from what I've experienced with GraphQl interfaces, it only returns a single object from the query.
My aim is to obtain with the with the following query:
{
vehicle {
maxSpeed
... on Car {
licensePlate
}
... on Airplane {
wingspan
}
}
}
the following result:
{
"data": {
"car": [
{
"maxSpeed": 200,
"licensePlate": 1.8
},
{
"maxSpeed": 120,
"licensePlate": "String"
},
...
],
"Airplane": [
{
"maxSpeed": 500,
"wingspan": "String"
},
{
"maxSpeed": 700,
"wingspan": 1.5
},
...
]
}
}
meteor graphql apollo apollo-client apollo-server
asked Nov 10 at 23:33
danyhiol
100113
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm having some issues with GraphQl interfaces. Let take the example in the doc:
interface Vehicle {
maxSpeed: Int
}
type Airplane implements Vehicle {
maxSpeed: Int
wingspan: Int
}
type Car implements Vehicle {
maxSpeed: Int
licensePlate: String
}
type Query {
vehicle: Vehicle
}
const resolvers = {
Vehicle: {
__resolveType(obj, context, info){
if(obj.wingspan){
return 'Airplane';
}
if(obj.licensePlate){
return 'Car';
}
return null;
},
},
Query: {
vehicle: () => {
// Query Airplane and Car an merge in one single array.
}
},
};
Background: I create 2 different DBs for each interfaces implementation: one for Car and one for Airplane. But I did not create a DB for Vehicle since it just an interface that does not keep data in itself. (I hope this is fine)
The first problem is how to access Car and Airplane resolvers to query their respective DBs in the Vehicle resolver? So in Query.vehicle(), I would like to just call the resolver defined for fetching all cars to get all cars and call the one for fetching airplanes to get all airplanes in the DB. (note using Car.find().fetch() is not always effective because before doing the query, lots of other query needs to be done also avoid code duplication).
The Second problem is that in the example, obj.wingspan assume that obj should be an object. So returning an array from Query.vehicle(), won't help because this query is used in Vehicle.__resolveType. So from what I've experienced with GraphQl interfaces, it only returns a single object from the query.
My aim is to obtain with the with the following query:
{
vehicle {
maxSpeed
... on Car {
licensePlate
}
... on Airplane {
wingspan
}
}
}
the following result:
{
"data": {
"car": [
{
"maxSpeed": 200,
"licensePlate": 1.8
},
{
"maxSpeed": 120,
"licensePlate": "String"
},
...
],
"Airplane": [
{
"maxSpeed": 500,
"wingspan": "String"
},
{
"maxSpeed": 700,
"wingspan": 1.5
},
...
]
}
}
meteor graphql apollo apollo-client apollo-server
asked Nov 10 at 23:33
danyhiol
100113
I'm having some issues with GraphQl interfaces. Let take the example in the doc:
interface Vehicle {
maxSpeed: Int
}
type Airplane implements Vehicle {
maxSpeed: Int
wingspan: Int
}
type Car implements Vehicle {
maxSpeed: Int
licensePlate: String
}
type Query {
vehicle: Vehicle
}
const resolvers = {
Vehicle: {
__resolveType(obj, context, info){
if(obj.wingspan){
return 'Airplane';
}
if(obj.licensePlate){
return 'Car';
}
return null;
},
},
Query: {
vehicle: () => {
// Query Airplane and Car an merge in one single array.
}
},
};
Background: I create 2 different DBs for each interfaces implementation: one for Car and one for Airplane. But I did not create a DB for Vehicle since it just an interface that does not keep data in itself. (I hope this is fine)
The first problem is how to access Car and Airplane resolvers to query their respective DBs in the Vehicle resolver? So in Query.vehicle(), I would like to just call the resolver defined for fetching all cars to get all cars and call the one for fetching airplanes to get all airplanes in the DB. (note using Car.find().fetch() is not always effective because before doing the query, lots of other query needs to be done also avoid code duplication).
The Second problem is that in the example, obj.wingspan assume that obj should be an object. So returning an array from Query.vehicle(), won't help because this query is used in Vehicle.__resolveType. So from what I've experienced with GraphQl interfaces, it only returns a single object from the query.
My aim is to obtain with the with the following query:
{
vehicle {
maxSpeed
... on Car {
licensePlate
}
... on Airplane {
wingspan
}
}
}
the following result:
{
"data": {
"car": [
{
"maxSpeed": 200,
"licensePlate": 1.8
},
{
"maxSpeed": 120,
"licensePlate": "String"
},
...
],
"Airplane": [
{
"maxSpeed": 500,
"wingspan": "String"
},
{
"maxSpeed": 700,
"wingspan": 1.5
},
...
]
}
}
meteor graphql apollo apollo-client apollo-server
meteor graphql apollo apollo-client apollo-server
asked Nov 10 at 23:33
danyhiol
100113
asked Nov 10 at 23:33
danyhiol
100113
asked Nov 10 at 23:33
danyhiol
100113
asked Nov 10 at 23:33
danyhiol
100113
asked Nov 10 at 23:33
danyhiol
100113
100113
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
It sounds like you may be trying to return multiple objects. If so, you'll need to return an array of objects:
type Query {
vehicles: [ Vehicle ]
}
If you're just trying to return a single object by ID, in your vehicle resolver, just try both databases and return the one with the result:
const resolvers = {
Query: {
vehicle: (parent, args) => {
const { id } = args;
const [ car, plane ] = await Promise.all(
await carDB.get(id),
await planeDB.get(id)
)
return car || plane
}
}
}
answered Nov 19 at 18:48
Dan Crews
1,4991019
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
It sounds like you may be trying to return multiple objects. If so, you'll need to return an array of objects:
type Query {
vehicles: [ Vehicle ]
}
If you're just trying to return a single object by ID, in your vehicle resolver, just try both databases and return the one with the result:
const resolvers = {
Query: {
vehicle: (parent, args) => {
const { id } = args;
const [ car, plane ] = await Promise.all(
await carDB.get(id),
await planeDB.get(id)
)
return car || plane
}
}
}
answered Nov 19 at 18:48
Dan Crews
1,4991019
add a comment |
up vote
0
down vote
It sounds like you may be trying to return multiple objects. If so, you'll need to return an array of objects:
type Query {
vehicles: [ Vehicle ]
}
If you're just trying to return a single object by ID, in your vehicle resolver, just try both databases and return the one with the result:
const resolvers = {
Query: {
vehicle: (parent, args) => {
const { id } = args;
const [ car, plane ] = await Promise.all(
await carDB.get(id),
await planeDB.get(id)
)
return car || plane
}
}
}
answered Nov 19 at 18:48
Dan Crews
1,4991019
add a comment |
up vote
0
down vote
up vote
0
down vote
It sounds like you may be trying to return multiple objects. If so, you'll need to return an array of objects:
type Query {
vehicles: [ Vehicle ]
}
If you're just trying to return a single object by ID, in your vehicle resolver, just try both databases and return the one with the result:
const resolvers = {
Query: {
vehicle: (parent, args) => {
const { id } = args;
const [ car, plane ] = await Promise.all(
await carDB.get(id),
await planeDB.get(id)
)
return car || plane
}
}
}
answered Nov 19 at 18:48
Dan Crews
1,4991019
It sounds like you may be trying to return multiple objects. If so, you'll need to return an array of objects:
type Query {
vehicles: [ Vehicle ]
}
If you're just trying to return a single object by ID, in your vehicle resolver, just try both databases and return the one with the result:
const resolvers = {
Query: {
vehicle: (parent, args) => {
const { id } = args;
const [ car, plane ] = await Promise.all(
await carDB.get(id),
await planeDB.get(id)
)
return car || plane
}
}
}
answered Nov 19 at 18:48
Dan Crews
1,4991019
answered Nov 19 at 18:48
Dan Crews
1,4991019
answered Nov 19 at 18:48
Dan Crews
1,4991019
answered Nov 19 at 18:48
Dan Crews
1,4991019
1,4991019
add a comment |
add a comment |
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