In PHP Lighthouse you can have ManyToMany relationships. Using nested operations allows you to create say an Author, Post and connect them using a pivot table post_author ALL in one operation.
Lighthouse also allows you to store data in the pivot table. In their docs, they give an example of how to connect a record with some pivot table data. There is no example available on how to do a create operation with extra pivot table data.
Docs pivot data update operation: https://lighthouse-php.com/master/eloquent/nested-mutations.html#storing-pivot-data
type Mutation {
createPost(input: CreatePostInput! #spread): Post #create
}
input CreatePostInput {
title: String!
authors: CreateAuthorBelongsToMany
}
input CreateAuthorBelongsToMany {
create: [CreateAuthorInput!]
}
input CreateAuthorInput {
name: String!
#contribution_percentage: Int! #Pivot table column
}
#query:
mutation {
createPost(
input: {
title: "My new Post"
authors: {
create: [{ name: "Herbert", contribution_percentage: 50 }]
}
}
) {
id
authors {
name
}
}
}
I tried fiddling with the scheme to "guess" the correct scheme, to no avail.
My objective is: Create an Author, Post, and connect them using a post_author pivot table WITH extra pivot data, ALL in one operation.
Related
Maybe the title is not accurate but I really don't know how to describe it anymore. I went through multiple documentations and descriptions but still couldn't figure it out.
I want to implement a basic social media like followers/following query on my type User. I am using MySQL and for that I made a separate table called Follow as it's a many-to-many connection.
Here is a pseudo-ish representation of my tables in the database without the unnecessary columns:
Table - User
user_id primary key Int
Table - Follow
follow_er foreign_key -> User(user_id) Int
follow_ed foreign_key -> User(user_id) Int
A user could "act" as a follow_er so I can get the followed people
And a user could be follow_ed, so I can get the followers.
My prisma schema look like this:
model User {
user_id Int #id #default(autoincrement())
following Follow[] #relation("follower")
followed Follow[] #relation("followed")
}
model Follow {
follow_er Int
follower User #relation("follower", fields: [follow_er], references: [user_id])
follow_ed Int
followed User #relation("followed", fields: [follow_ed], references: [user_id])
##id([follow_er, follow_ed])
##map("follow")
}
By implementing this I can get the followers and following object attached to the root query of the user:
const resolvers = {
Query: {
user: async (parent, arg, ctx) => {
const data = await ctx.user.findUnique({
where: {
user_id: arg.id
},
include: {
following: true,
followed:true
}
})
return data
}....
Here is my GraphQL schema I tried to make:
type Query{
user(id: Int!): User
}
type User{
id: ID
following: [User]
followed: [User]
}
So I can get something like:
query {
user(id: $id) {
id
following {
id
}
followed{
id
}
}
}
}
But I couldn't make it work as even if I get the the array of objects of {follow-connections}:
[
{
follow_er:1,
follow_ed:2
},
{
follow_er:1,
follow_ed:3
},
{
follow_er:3,
follow_ed:1
},
]
I can't iterate through the array. As far as I know, I have to pass either the follow_er or follow_ed, which is a user_id to get a User object.
What am I missing? Maybe I try to solve it from a wrong direction. If anybody could help me with this, or just tell me some keywords or concepts I have to look for it would be cool. Thanks!
I would suggest creating self-relations for this structure in the following format:
model User {
id Int #id #default(autoincrement())
name String?
followedBy User[] #relation("UserFollows", references: [id])
following User[] #relation("UserFollows", references: [id])
}
And then querying as follows:
await prisma.user.findUnique({
where: { id: 1 },
include: { followedBy: true, following: true },
})
So you will get a response like this:
I am using appsync with amplify and trying to figure out how to query based on two different selectors. Basically I need to either query all if neither county or facility are supplied, query with county while facility is empty, or query with facility while county is empty. I thought I could wrap this into 1 query but it doesn't seem like I can. My appsync schemas look like this.
type Client
#model
#key(name: "clientByCountyOrFacility", fields: ["county", "facility"], queryField: "getClientsByCountyOrFacility")
#searchable {
id: ID!
facility: String!
county: String!
products: [Product] #connection(name: "ClientProducts")
}
type Product
#model
#searchable {
id: ID!
client: Client #connection(name: "ClientProducts")
}
I can get this to work by using (below query) but I am worried this will run into the 100 scan limit because it uses the listClients query underneath. Possibly if there was an easy way to change that could be a solution but it seems the files in amplify are autogenerated.
query getClientsByCountyOrFacility($county: String = "", $facility: String = "") {
listClients(filter: {
county: {
contains: $county
}
facility: {
contains: $facility
}
}) {
items {
id
products {
items {
id
}
}
}
}
}
I added the #key to see if I could create an index but it doesn't like that and I'm at a lose for how to acquire the data. How do I go about building this schema and query to get the data back?
I am building my first many-to-many insert mutation in Hasura and finding it difficult. The syntax in the docs and the accompanying explanation is very difficult to follow.
I am simply trying to add a connection between a component and a module.
Here is the state of my current query.
mutation MyMutation {
insert_component(objects: {component_module: {data: {module: {data: {id: "775c9e27-c974-4cfa-a01f-af50bd742726"}, on_conflict: {constraint: module_id_key, update_columns: id}}}}}) {
affected_rows
returning {
id
component_modules
}
}
}
Here is the error I get.
{
"errors": [
{
"extensions": {
"path": "$.selectionSet.insert_component.args.objects[0].component_module.data",
"code": "constraint-violation"
},
"message": "Not-NULL violation. null value in column \"component_id\" violates not-null constraint"
}
]
}
Here is my component table
Here is my module table
Here is my component_module bridge table
Thanks in advance for your help.
Your mutation is not working because you are inserting the id manually and when Hasura generates the query it won't have the id in the parent.
When doing nested inserts the best is to let PostgreSQL generate the ids for you. This way you will be able to insert with either side of the relationship.
In your example you don't really need to have the component_modules column in each table. When doing many to many inserts you can use the id of each table as the foreign key.
For example:
component
- id
- created_at
- updated_at
- name
module
- id
- created_at
- updated_at
- name
component_module
- component_id
- module_id
And the mutation should be something like:
mutation {
insert_component(objects: {
name:"component name",
component_modules: {
data: {
module: {
data: {
name: "module name"
}
}
}
}
}) {
returning {
id
component_modules {
component {
name
}
}
}
}
}
I have some Laravel models that are related via a pivot table in a belongsToMany relation.
Now I try to create a mutation in Laravel Lighthouse to join the models and also fill the pivot values.
Somehow I cannot find out how to do this.
The Course model looks like this:
class Course extends Model
{
public function programs(): BelongsToMany
{
return $this->belongsToMany(\App\Models\Program::class, 'Course_Program')
->withPivot('id', 'year_id')
->withTimestamps();
}
}
My GraphQL code looks like this:
type Mutation {
createCourse(input: CreateCourseInput! #spread): Course! #create
}
type Course {
id: ID!
name: String!
programs: [ProgramWithPivot!]! #belongsToMany
}
type Program {
id: ID!
name: String!
}
type ProgramWithPivot {
id: ID!
name: String!
year_id: ID!
}
input CreateCourseInput {
name: String!
programs: CreateCourseProgramsRelation!
}
input CreateCourseProgramsRelation {
create: [CreateCourseProgramInput!]
}
input CreateCourseProgramInput {
id: ID!
year_id: ID!
}
The problem is that when I try to create programs in my course like this:
mutation {
createCourse(input: {
name: "new cours"
programs: {
create: [{
id: 1
year_id: 2
}]
}
}) {
id
programs {
id
year_id
}
}
}
Laravel Lighthouse tries to insert data into the Program table (and complains that Program.name does not have a default value).
However, I want to insert data (course_id, year_id and program_id) into the Course_Program table.
How do I tell Laravel Lighthouse to insert data in the pivot-table?
Mutating pivot data is currently not there, but I did a PR for this last week. You can follow the PR progress
In general it will be included either the way I did it, or maybe a little bit different. It was discussed in this issue
For now you can update your pivot data only using custom resolver/directive. But probably the best way will be just to wait till PR gets merged.
There is any way of doing update / upsert to pivot data via nested mutation?
I have a CHAT_MESSAGE_FRAGMENT that returns all the message data from my Hasura graphql api.
However, the Gifted Chat react-native component requires the data in a specific structure so I'm attempting to convert it with the query below.
I'm able to alias all the top level data but can't figure out how to add a nested level of data.
I'm guessing it isn't possible but I thought I'd ask in case I'm missing something.
const GIFTED_CHAT_GROUP_MESSAGES_QUERY = gql`
query chatGroupMessages($chatGroupId: Int!) {
chat_message(
where: { to: { id: { _eq: $chatGroupId } } }
) {
_id: id,
# user: {
# _id: from.id, <== How do I add
# name: from.name, <== this secondary level?
# },
text: message,
image: image_url,
createdAt: created_at,
system: message_type,
}
}
${CHAT_MESSAGE_FRAGMENT}
`;
Assuming you already have chat_message.user_id -> users.id foreign key constraint set up, you'll also need to alias the from object in addition aliasing any of its nested fields:
const GIFTED_CHAT_GROUP_MESSAGES_QUERY = gql`
query chatGroupMessages($chatGroupId: Int!) {
chat_message(
where: { to: { id: { _eq: $chatGroupId } } }
) {
_id: id,
from: user: {
_id: id,
name
},
text: message,
image: image_url,
createdAt: created_at,
system: message_type,
}
}
${CHAT_MESSAGE_FRAGMENT}
`;
The secondary level of data is basically nested object queries in Hasura. You can nest any number of queries as long as a relationship has been created.
In this case, assuming the chat_message table has a user_id field, you can establish a foreign key constraint for chat_message.user_id -> users.id, where users is a table with id as primary key.
Once the foreign key constraint is created, Hasura Console automatically suggests relationships. Here user would be an object relationship in chat_message table.
Here's the official docs link for Creating a relationship