I have some json data in file called countryData.json structured as so:
{
"info":"success",
"stats":
[{
"id":"1",
"name":"USA",
"type":"WEST"
},
//...
I'm using graphQL to access this data. I have created an object type in the schema for countries using the following:
const CountryType = new GraphQLObjectType({
name: "Country",
fields: () => ({
id: { type: GraphQLID },
name: { type: GraphQLString },
type: { type: GraphQLString },
})
});
I want to write a query that will allow me to access all of the elements of this array that have a certain "name" value(There can be multiple with the same name). I've written the following query, but it only returns the first match in the array:
const RootQuery = new GraphQLObjectType({
name:"RootQueryType",
fields:{
country: {
type: CountryType,
args: { type: { name: GraphQLString } },
resolve(parent, args){
return _.find(countryData.stats, {name: args.name});
}
}
}
});
The "_" comes from const _ = require('lodash');
Also, how can I just get every single item in the array?
I have not recreated the code, therefore I can not check if it would be executed correctly. This is code, that should work in my opinion (without trying). If you want to return array of elements you need to implement https://lodash.com/docs/#filter. Filter will return all objects from stats, which match the argument name. This will return correctly inside resolver function, however, your schema needs adjustments to be able to return array of countries.
You need probably rewrite the arguments as follows as this is probably not correct. You can check out how queries or mutation arguments can be defined https://github.com/atherosai/express-graphql-demo/blob/feature/2-json-as-an-argument-for-graphql-mutations-and-queries/server/graphql/users/userMutations.js. I would rewrite it as follows to have argument "name"
args: { name: { type: GraphQLString } }
You need to add GraphQLList modifier, which defines, that you want to return array of CountryTypes from this query. The correct code should look something like this
const RootQuery = new GraphQLObjectType({
name:"RootQueryType",
fields:{
country: {
type: CountryType,
args: { name: { type: GraphQLString } },
resolve(parent, args){
return _.find(countryData.stats, {name: args.name});
}
},
countries: {
type: new GraphQLList(CountryType),
args: { name: { type: GraphQLString } },
resolve(parent, args){
return _.filter(countryData.stats, {name: args.name});
}
}
}
});
Now if you call query countries, you should be able to retrieve what you are expecting. I hope that it helps. If you need some further explanation, I made the article on implementing lists/arrays in GraphQL schema as I saw that many people struggle with similar issues. You can check it out here https://graphqlmastery.com/blog/graphql-list-how-to-use-arrays-in-graphql-schema
Edit: As for the question "how to retrieve every object". You can modify the code in resolver function in a way, that if the name argument is not specified you would not filter countries at all. This way you can have both cases in single query "countries".
Related
I have a Class schema that looks like this:
const ClassSchema = new mongoose.Schema({
title: {
type: String,
...
},
classImageURL: {
type: String,
...
},
imageWidth: {
type: String,
...
},
imageHeight: {
type: String,
...
}
});
module.exports = mongoose.models.Class || mongoose.model("Class", ClassSchema);
And a Subject schema that looks like this:
const SubjectSchema = new mongoose.Schema({
subjectTitle: {
type: String,
...
},
subjectImageURL: {
type: String,
...
},
imageWidth: {
type: String,
...
},
imageHeight: {
type: String,
...
},
});
module.exports =
mongoose.models.Subject || mongoose.model("Subject", SubjectSchema);
On a dynamic page named [className], I am getting the data of the particular className from the database and destructured it. Now, on the class page, I want to send a post request to the database using all the fields titled in the Subject schema. But, I also want to add the class data that I got and add it to the Subject schema.
I used a state to hold all the data:
setForm({
subjectTitle: enteredSubjectTitle,
subjectImageURL: response.data.url,
imageWidth: response.data.width,
imageHeight: response.data.height,
classDetail: classDetail // this is the data I have on the particular class data
}); // I want to add
And I tried to make changes in the Subject schema like this:
classDetail: { Class }, // I added this in the last part of the schema
It results in a post error.
How can I achieve what I want to?
Here I am trying to modify my data over the iteration and send some result to API call.
The API Call receives a request with a structured data format which is
{ list: [{ id: "1", name: "Hello" }, ... ] }
Somehow I managed to call the API with single data ( const params in my current code, it only accepts single data).
But now it has to be done with multiple data something like this:
{ list: [{ id: "1", name: "Hello" }, { id: "22", name: "Ed" }, { id: "36", name: "Jason" } ... ] }
Here is my current code
const [table, setTalbe] = useState(..); // assume, we have some table data here
const processNow = () => {
let id = 0;
let name = '';
// if table length is greater than 1, we go for the loop.
if (table.length >= 1) {
table.map(data => {
id = data.userId;
name = data.userName;
});
//insert table data to params, here I want to add whole table data into "list"
//the final result of this list should be something like this
//ex ) list: [{ id: '123', name: 'Josh' }, { id: '125', name: 'Sue' }, { id: '2222', name: 'Paker' } ...],
// but how??
const params: any = {
list: [
{
id: id,
name: name
},
],
};
//send PUT reqeust with params
axios
.put(
'/api/v1/tosent',
params,
)
.then(res => {
console.log('The response', res);
})
.catch(err => {
console.log('The error: ', err);
});
}
};
but I'm stuck with it, please help me to finish this code to work properly.
need your kind advice.
Array.prototype.map returns a new array with the function you pass applied to every element. You should study the MDN documentation on map to understand its use.
Your current code does nothing with the map return value:
table.map(data => {
id = data.userId;
name = data.userName;
});
You probably assumed .map would mutate the data, as in change it in place. Instead, the whole operation returns a new array.
It looks like you want to do:
const list = table.map(data => {
return {
id: data.userId,
name: data.userName
}
});
This is applying a function to every element in the array that will map each element to a new object, matching your question, with an id and name key. Then it looks like you want to pass the returned value of map (which we named list above) to your call:
const params: any = {
list: list
};
const MUTATION_QUERY = gql`
mutation MUTATION_QUERY(
$name: bigint!
) {
insert_name(
objects: {
name: $name
}
) {
returning {
id
name
}
}
}
`;
const [onClick, { error, data }] = useMutation<{}, {}>(MUTATION_QUERY, {
variables: {
name: 1234,
},
});
My mutation query is inserting name in my table and autogenerating the id. On console logging the data variable I can view the fields id and name in the data object. But I am not able to access them them individually. How can I console.log "id". Thank you.
the console.log(data) looks like : {insert_name: {...}}
which expands to :
insert_name:
returning: Array(1)
0: {id: 1, name: 1234}
length: 1
_proto_: Array(0)
_typename: "insert_name_mutation_response
You can access the fields of an object with .
For example, if your object looks like this -
data = {
id: 1,
name: 'Jane',
}
You can get just the id with data.id
This works no matter how many layers deep your object may go, so take this example -
data = {
person: {
id: 1,
name: 'Jane',
}
}
You could get the id of person with data.person.id.
console.log(data.insert_name.returning[0].id) will give you the id returned.
For it to work in typescript we need to change the query to add the return type of data
const [onClick, { error, data }] = useMutation<{ReturnInsertNameProps}, {}>(MUTATION_QUERY, {
variables: {
name: 1234,
},
});
interface ReturnInsertNameProps {
insert_name: ReturnQueryProps;
}
interface ReturnProps {
returning: MessageProps[];
}
interface NameProps {
id: number;
name: number;
}
We can also use onCompleted method provided in useMutation if we want to process the result of the query.
My partner and I have searched everywhere and tried everything with the Mongo documentation to look up how to insert and update new schema and update all of the documents in the database. We did not have any luck. Right now we are trying to add two new fields onto all of the current documents within the database. Both are array fields which we have updated the schema but nothing showing for the documents themselves. ALSO I AM FULLY AWARE there are many questions that are similar but I wanted to see if anyone could figure out our problem since it seems to work for everyone else but not us
MongoDB documentation
update, $set and upsert aggregation functions
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
//Schema for how we define a movie object
const MovieSchema = new Schema({
id: {
type: Number
},
title: {
type: String
},
year: {
type: Number
},
rating: {
type: String //(PG, PG-13, R, NR, MA)
},
cast: {
type: [String], //Hold multiple cast members based on how many the user types in
default: undefined
},
quotes: {
type: [String],
default: undefined
},
genres: {
type: [String],
default: undefined
},
synopsis: {
type: String
},
imageURL: {
type: String
},
bannerURL: {
type: String
}
})
const Movie = mongoose.model('movies', MovieSchema);
module.exports = Movie;
These are the new fields being added to all documents
comments:{
type: [String],
default: undefined
},
characters: {
type: [String]
default: undefined
}
we have done most of the mongo functions through the commandline and prefer to do it that way unless there isn't a way
Assuming you've already updated your schema to have the two new fields:
Movie.find()
.then((allMovies) => {
allMovies.forEach((movieSchema) => {
//create two new fields in each schema
movieSchema.comments = []
movieSchema.characters = []
//save the schema we updated
movieSchema.save()
})
})
.catch((errors) => {
return res.status(400).json({ nomoviesfound: "could not find movies"})
})
I'm attempting to both add and remove items in a multidimensional array stored in Vuex.
The array is a group of categories, and each category and have a sub-category (infinity, not simply a two dimensional array).
Example data set is something like this:
[
{
id: 123,
name: 'technology',
parent_id: null,
children: [
id: 456,
name: 'languages',
parent_id: 123,
children: [
{
id:789,
name: 'javascript',
parent_id: 456
}, {
id:987,
name: 'php',
parent_id: 456
}
]
}, {
id: 333,
name: 'frameworks',
parent_id 123,
children: [
{
id:777,
name: 'quasar',
parent_id: 333
}
]
}
]
}
]
....my question is, how do I best add and remove elements to this array, which is inside of a Vuex Store?
I normally manipulate simple arrays inside the Vuex Store using Vue.Set() to get reactivity. However, because I'm not sure how deep the nested array being manipulated is - I simply can't figure it out.
Here's an example of how I thought I could add a sub-category element using recursion:
export const append = (state, item) => {
if (item.parent_uid !== null) {
var categories = []
state.data.filter(function f (o) {
if (o.uid === item.parent_uid) {
console.log('found it')
o.push(item)
return o
}
if (o.children) {
return (o.children = o.children.filter(f)).length
}
})
} else {
state.data.push(item)
}
}
The first thing to understand is that vuex, or any other state management library based on flux architecture, isn't designed to handle nested object graph, let alone arbitrary/infinity nested objects that you mentioned. To make the matter worse, even with shallow state object, vuex works best when you define the shape of the state (all desired fields) upfront.
IMHO, there are two possible approaches you can take
1. Normalize your data
This is an approach recommended by vue.js team member [here][2].
If you really want to retain information about the hierarchical structure after normalization, you can use flat in conjunction with a transformation function to flatten your nested object by name to something like this:
const store = new Vuex.Store({
...
state: {
data: {
'technology': { id: 123, name: 'technology', parent_id: null },
'technology.languages': { id: 456, name: 'languages', parent_id: 123 },
'technology.languages.javascript': { id: 789, name: 'javascript', parent_id: 456 },
'technology.languages.php': { id: 987, name: 'php', parent_id: 456 },
'technology.frameworks': { id: 333, name: 'frameworks', parent_id: 123 },
'technology.frameworks.quasar': { id: 777, name: 'quasar', parent_id: 333 },
}
},
});
Then you can use Vue.set() on each item in state.data as usual.
2. Make a totally new state object on modification
This is the second approach mentioned in vuex's documentation:
When adding new properties to an Object, you should either:
Use Vue.set(obj, 'newProp', 123), or
Replace that Object with a fresh one
...
You can easily achieve this with another library: object-path-immutable. For example, suppose you want to add new category under languages, you can create a mutation like this:
const store = new Vuex.Store({
mutations: {
addCategory(state, { name, id, parent_id }) {
state.data = immutable.push(state.data, '0.children.0.children', { id, name, parent_id });
},
},
...
});
By reassigning state.data to a new object each time a modification is made, vuex reactivity system will be properly informed of changes you made to state.data. This approach is desirable if you don't want to normalize/denormalize your data.