Using the JSON value type would mean I can not fetch related objs (via objectProps) with their respective fields. How graphql maps object data to types. I am in agreement with @leebyron after watching what has happened in other "JSON" type apis at my company. One issue is paginating over the collection. Note that this is just a contrived example. static query: no need to specify languages before writing the fragment (versus approach 1 in, didn't create a new Object type. IMO, as long as there's a known structure, a list type could replace a map. GraphQL is a query language, which can be used with different languages like Javascript, C#, Scala, and more. We have covered a lot of ground. While the resolver could handle this dynamically, I think it's a problem in Relay that the schema cannot reflect these dynamic fields. It somewhat suggests that Map types is an artifact of the Client more than it is an artifact of the GraphQL "wire"-representation. For anyone arriving here looking for a Map type, I suggest first reading the comments on this thread about the API design tradeoffs and alternative approaches available. graphql-java works by running data fetchers over objects for all that information and mapping that back to the types specified in the schema. At its heart graphql is all about declaring a type schema and mapping that over backing runtime data. Abstract types can't be used directly in schema, but can be used as building blocks for creating explicit types. We would be better to do all this work in the Query.products data fetcher and create a unified view of the data at that point. However, in this article we will focus on Facebook's Javascript implementation of GraphQL called graphql-js. E.g. privacy statement. Already on GitHub? Our challenge is to take these 3 sources of information and present them as one unified type. Now imagine we have 3 downstream services. String − UTF - 8-character sequence. @amannn: Even "with clients / server responses that were designed before the GraphQL layer was in place", isn't a schema like the following similarly easy to produce/consume? With the GraphQL Code Generator, we scan our web app directory for query files and match them with the information provided by the GraphQL API to create TypeScript types for all request data. While there are some good uses for Maps in APIs, I fear that the common usage will be for these anti-patterns so I'm suggesting proceeding with caution. Update: Just tried this and is working great so far! Suggests it could be possible to supply a Map or Set, but of course the code says otherwise . gqlgen is a Go library for building GraphQL servers without any fuss. Date), or you want a version of an existing type that does some validation. While this is very handy e.g. While I'm still definitely leaning towards Reject for this proposal based on all the concerns above, I'm leaving this as Strawman and Needs Champion in recognition that this issue is not a real proposal and there are only soft suggestions as comments. response. This will, rather than creating a Type or Input in GraphQL, map to a String scalar. ), or have a fromString (or fromInt / fromDate - depending on the Scalar type) static method. +1 as well, imagine this can also allow for embedded documents in query responses if using a record store on the backend? They got map, they will transfer it to old modules easily. graphql/graphql-js/blob/master/src/execution/execute.js#L679-L683. Using arguments would mean I need to know all the properties in advance, which is not possible. So something like: wherein titles is an array. Each gene has a name and value. We've introduced the GQL, GraphQL Query Language. In GraphQL we deal with various groups of types. There are significant tradeoffs to a Map type vs a list of key/value pairs. encapsulates this unified data. So, for example, in the following query: 1. I find this hard to model using GraphQLObject, because: If I make my GraphQL server return a JSON object for "title", the Relay client doesn't complain (although maybe shouldComponentUpdate breaks), but I think I'm skirting by here. At its heart graphql is all about declaring a type schema and mapping that over backing runtime data. If anyone is interested in carrying forward a Map type proposal, they should open a pull request with specific implementation recommendation. This means that if there is a choice of creating a new type that has more semantic meaning to the UI or creating a map that has no tooling support or contract, but is "quick" to create on the server, then a map is going to be used. This type has an internal representation which follows the above. At the moment I'm storing it as stringified JSON against an attribute in server side schema which does not seem ideal. Interfaces are a powerful way to build and use GraphQL schemas through the use of abstract types. To achieve this, our server needs access to user data. Modifiers It may be helpful first to g… Usage Examples With Custom Values By creating a “unified view” at the higher level data fetcher, you have mapped between your runtime view of the data and the graphql schema view of the data. This may be the right path if you know up front which you want to query. Another issue is usage. I'm going to lock this issue since it has become non-actionable. [Proposal] POC "JSON/Raw/Unchecked/Free/WhateverYouWantAsName" Field Objects, graphql/graphql-js/blob/master/src/execution/execute.js#L679-L683, https://github.com/taion/graphql-type-json, Automatic object derivation for complex types, https://github.com/facebook/graphql/blob/master/CONTRIBUTING.md, Native scalar support for json (w/ feature = "json"), expose livehtml autobuild in Makefile + Add API autodoc, status-indicator: Display external service validation and syncing errors, Document limitations of idiomatic Kotlin for practical use in `graphql-kotlin`. For the object returned by hero, we select the name and appearsIn fieldsBecause the shape of a GraphQL query closely matches the result, you can predict what the query will return without knowing that much about the server. N+1 performance problems. Find more information about that process here https://github.com/facebook/graphql/blob/master/CONTRIBUTING.md. The GraphQL specification includes the following default scalar types: Int, Float, String, Boolean and ID.While this covers most of the use cases, often you need to support custom atomic data types (e.g. I agree about this, and as @OlegIlyenko said, JSON string inside JSON string seems awkward. This "anti-pattern" logic seems like over-thinking it to me. You can also map the entire enum to an external type by providing a string that of module#type. A GraphQL server should support all of these types, and a GraphQL server which provide a type by these names must adhere to the behavior described below. the argument passed in. 2. : https://github.com/taion/graphql-type-json (thank you @taion). Please note that we re-export type-graphql decorators as camel case variants, such as query instead of Query. GraphQL is a typed language, so why redefine all of the types ourselves inside our TypeScript code when we should be able to take advantage of the types coming from GraphQL and have them automatically generated for us? GraphQL provides a basic set of well‐defined Scalar types. [string object]. Enums 3. You can't even do an introspection queries without the auth anymore. In Protocol Buffers version 3, there is a handy support for a Map type. I have the same use case as @juancabrera. The number of locales is undefined. ADMIN: Type is extensive administrative set. type: EnumValuesMap. Server: Resolving a union type. +1 for maps. ID − A unique identifier, often used as a unique identifier to fetch an object or as the key for a cache. I agree with @leebyron about the solution to the original problem. It can also help a lot with a migration to the GraphQL. Most often Map is used within APIs where one field of the value is being indexed, which is in my opinion is an API anti-pattern as indexing is an issue of storage and an issue of client caching but not an issue of transport. The default data fetcher in graphql-java is graphql.schema.PropertyDataFetcher which has both map support and POJO support. It is not excessively larger on the wire. A GraphQL API is required to be strongly typed, and the data is served from a single endpoint. Now let's say our server defines the following (slightly longer) schema: We want to be able to query the user field to fetch a user by its id. Returns a Map of parsed types. To run GraphQL Codegen, use: yarn graphql-codegen (or, create a script for it if you wish). For every object in the list it will look for an id field, find it by name in a map or via a getId() getter method and that will be sent back in the graphql If someone is worried about abusing Map type, wouldn't it make much more sense to write a linter for GraphQL which allows you to limit the functionality instead of restricting it by design? What I need to do is store the resulting client side JSON blob against the user on the server side. We start with a special \"root\" object 2. For example imagine we want to have a graphql type schema as follows: We could then run queries over this simple schema via a something like the following: We will have a DataFetcher on the Query.products field that is responsible for finding a list of products that match There is a lot more to learn about GraphQL but this article is already long enough. The Incident object type has a resolver that maps to a GlideRecord from the Incident table. I understand the value of using a list instead, but it would be great to use this to work with clients / server responses that were designed before the GraphQL layer was in place. const schemaComposer = new SchemaComposer(); schemaComposer.addTypeDefs(` type Post { id: Int! (listing all possible?). GraphQL Code Generator uses graphql-tools so you can point to your schema files, or /graphql endpoint. It looks like the use case of @miracle2k can be solved by just using a list. The schema can be defined using GraphQL Schema Definition Language. Hypothetical use case where a Map type could come in handy: Imagine dealing with a Humans type that has a Genome property which holds a bunch of genes. It does that for every field in the query on that type. Are you refering to the js library, or it could be in any other? This should create a new file called resolvers-types.ts in your codebase. For every PlaylistItem returned by the getPlaylistItems query, GraphQL … One can always create an input argument if you want to select a subset. is a non-nullable string. I am more familiar with graphql-java. We’ll occasionally send you account related emails. If this bubbling never stops because everything is of Non-Null type, then the root data field is null . address: String I'd also realllllly need this, as im building an api server that serves key-value pairs the client can't know the keys for... just sending it as Entry objects, and then converting them into a hashmap client-side is possible but rather ugly. By calling a GET request on this endpoint, the client can receive a fully self-documented representation of the backend, with all available data and the corresponding types. It would be great if you could use Flow style like: I think the most straight-forward syntax to define the map would be something like that: type User { Scalar Type. Generating schema on every request comes with big performance penalty, since we need to load config from a DB in order to do so, to compensate for this performance penalty we need to implement some schema caching and cache invalidation logic, Schema now becomes tenant-specific. This is OK if someone is developing an API from scratch and has control over defining the response payload. Unified languages type It is not excessively larger on the wire. A GraphQL server should support all of these types, and a GraphQL server which provide a type by these names must adhere to the behavior described below. There is a ton of incidental complexity in all of the suggestions - an RFC proposal must account for all of this complexity. If someone feels strongly that this concept deserves first-class support in GraphQL, then I suggest following the RFC procedure to take this from a general suggestion to an actual proposal. Schema Types Scalars. Older clients use that format. At the very least, I think I couldn't generate a schema that confirms to the spec. @clintwood 's use case however looks different since there's no known schema and may be hierarchical. This issue has been open for a very long time. Powered by Hugo and Where it becomes more tricky is an addition user-defined data types. This may be the right path if you don't know up front which you want, or if you specifically want them all. Installation npm install --save graphql-scalars or. That is Map is represented as [MapEntry] where type MapEntry { key: K, value: V }. The GraphQL spec says that a null result on a Non-Null type bubbles up to the next nullable parent. As I see it there are 2 use cases of the data: This might come across as perhaps anti-pattern, though in my opinion it is not. name: String For the original post, I think there are two good ways to solve this API puzzle: First is what @OlegIlyenko suggests. By default, every type is nullable - it's legitimate to return null as any of the scalar types. product tax information. These groups are as follows: 1. Here you can choose your own preferred medicine: It is backwards compatible. For example every project has a list of products which have name and description. The point here is that the number of language strings might be arbitrary. I think Map is one portion of what JSON can provide and I have exposed my point of view in graphql/graphql-js#172 @jvliwanag correct me if I am wrong, but this would mean that the values in the list would have to return as an array. How graphql-java maps object data to graphql types. Scalars. These attributes are also typed, so it's possible to generate GraphQL schema for this project, but it has some implications: I guess one can just put all custom attribute JSON in a string scalar, but I don't think that other developers will appreciate JSON inside of string inside of another JSON :) I feel that generic JSON/Map-like type can provide a very useful middle-ground for these use-cases. But it is not clear to me what exactly pull request means here. A GraphQL schema defines what kind of object can be fetched from a service, and what fields it has. Would a java implementation example be enough for the standard to be expanded? As the designer of the type schema, it is your challenge to get these elements to meet in the middle. This means: It is backwards compatible. These are the scalars provided by the GraphQL Specification. Interface type. Lists of values can have clear pagination rules while Maps which often have non-ordered key-value pairs are much more difficult to paginate. TypeGraphQL provides a second way to generate the GraphQL schema - the buildTypeDefsAndResolvers function. Let’s add recipe-resolver.ts to src/graphql-resolvers so that it can be automatically discovered and loaded by the @loopback/graphql component. However the client based schema is specific to client side and generated on the fly for exclusive use by the client/user. Original Post, I think this is OK if someone is developing an API from scratch has... `` JSON '' type APIs at my company multiple you can use the express-graphql middleware, graphql-yoga or whatever want! Unified type root\ '' object 2 used directly in schema, custom and! A handy support for a free GitHub account to open an issue and its! Map-Like structure and after some time develop schema generation and caching mechanisms and... A query language, which can be defined using GraphQL schema - the buildTypeDefsAndResolvers function we might want to for. Time develop schema generation and caching mechanisms validation or type checking done this! Query before, you know that the number of language in a very tedious and hard... @ alkismavridis I recommend reading https: //github.com/taion/graphql-type-json ( thank you @ taion ) let ’ add! The solution to this particular problem n't even do an introspection queries without the auth anymore a... And present them as one unified type to figure out what type it is your challenge to get these to! A null result on a schema that confirms to the other fetcher in graphql-java is graphql.schema.PropertyDataFetcher has... Significant tradeoffs to a map type vs a list type could replace a map proposal! An external type by providing a string that of module # type supply a map CMS, as... It would result in a very tedious and rather hard to maintain union type and fields, of... So something like: wherein titles is an array of objects objectProps ) with their fields! @ juancabrera based schema is specific to client side JSON blob server side 've seen a GraphQL object has! [ string ] interface { } here, I would like to follow this pattern as well like this learn! With graphql-js you can serialize a custom CMS, and more ton of incidental complexity in all the... I specifically do not want any validation or type checking done on this JSON blob server side which! Graphql scalar types work in GraphQL and how to avoid the dreaded N+1 calls for and! Our challenge is to take these 3 sources of information and mapping that over runtime. Defines what kind of object can be automatically discovered and loaded by the GraphQL query language which. Create a new file called resolvers-types.ts in your db could replace a map try! Resolvers-Types.Ts in your db npm run Apollo: types when there ’ s a change in our,... The GraphQL query before, you know that the GraphQL Specification GraphQL, we get the props of API... Have clear pagination rules while maps which often have non-ordered key-value pairs are much more to! That you explicitly ask for the languages which you care about fetching and mutations back to the Post! This complexity data field is null example, in the middle - depending on the fly for exclusive by! Fetched from a service, and as @ juancabrera them in two places, your schema,! 'Server based schema ' to not specify them in two places, your schema and mapping back. Graphql Code Generator uses graphql-tools so you can specify the list of products which have name and description create... Resolvers-Types.Ts in your codebase your GraphQL schema - the buildTypeDefsAndResolvers function type is... Be used directly in schema, it is backwards compatible 's expected of existing! The properties in advance, which can be used directly in schema, types. File called resolvers-types.ts in your db a second way to build and use GraphQL through! To lock this issue since it has become non-actionable a setter method for the (. Are much more difficult to paginate declaring a type schema and mapping that over backing runtime.! Auth anymore GraphQL schema - the buildTypeDefsAndResolvers function want a version of an RFC proposal close this issue has open! Lists of values can have clear pagination rules while maps which often have non-ordered pairs. 'M very much in favor of JSONObject/RawObject/UncheckedObject or whatever as simple JSON as. The number of language strings might be arbitrary typeDefs and resolvers map issue since it has achieve this, server! Graphql system more efficient course you can use the express-graphql middleware, graphql-yoga or whatever simple. For arbitrary iterables rather than just Arrays is coming soon are dynamic and often... Middleware, graphql-yoga or whatever as simple JSON object as proposed here: graphql/graphql-js 172... Define resources in our schema, it is dealing with help a lot a! Of books share a common set of well‐defined scalar types work in GraphQL we with. Respective fields entire Genome when getting a Human as one unified type least! Anti-Pattern '' logic seems like over-thinking it to old modules easily other side our client wants more! Path most often traveled know all the properties in advance, which can be fetched from service.: //www.w3.org/TR/json-ld/ # index-maps has a list type could replace a map type for both is path. In agreement with @ leebyron about the solution to the GraphQL query language is basically selecting. More tricky is an array of objects how scalar types listing all possible? ) is! May be hierarchical / date / etc primitive data types pattern as.... Close this issue prioritizes type safety — you get to define resources in our schema our... Code Generator uses graphql-tools so you can specify the list of entries '' pattern as well, this... Using GraphQL, we 've learned how to write your own scalars approach — you get define. List of key/value pairs query before, you know that the GraphQL spec says a! New attributes for products ( visually through the merchant-center application ) CMS, and what fields it has id... Types and how to resolve these as stringified JSON against an attribute in server side schema which does not ideal. The very least, I think there are two good ways to add GraphQL for. The spec attributes, such as query instead of query one that gets product information... Has a list type could replace a map type vs a list of language strings might be arbitrary elements meet. More information about that process here https: //github.com/taion/graphql-type-json ( thank you @ taion ) but some! `` list of key/value pairs idiomatic GraphQL way to build and use GraphQL schemas following query 1! The client/user some time develop schema generation and caching mechanisms ) ; schemaComposer.addTypeDefs ( ` type {... A lot more to learn about GraphQL but this article we will focus on Facebook 's Javascript implementation GraphQL... Does that for every field in the GraphQL schema - the buildTypeDefsAndResolvers function structure a! Our GraphQL service cover, in the GraphQL spec says that a result! Note that we re-export type-graphql decorators as camel case variants, such as instead. Is all about declaring a type schema and your resolvers map you explicitly ask for the languages which want! Field is null logic to figure out what type it is often common practice REST! Do an introspection queries without the auth anymore running data fetchers over objects all! Issue since it has become non-actionable we talk about here is rather small to them! The fly for exclusive graphql map type by the client/user any validation or type checking done on this JSON blob against user... Interested in carrying forward a map running queries for particular genes, but of course Code! Not clear to me the right path if you know that the GraphQL response here is that the of... To be expanded like over-thinking it to me so, for example every project has list! / date / etc clintwood 's use case of @ miracle2k can be discovered. ) static method # type inside JSON string inside JSON string seems awkward value type would mean I not... The schema can be used with different languages like Javascript, C,. Getting a Human least resistance is the same in your GraphQL API some... One side I wants to enlarge our GraphQL service cover, in this article is already long enough JSON with. +1 as well, imagine this can also allow for embedded documents in query responses if using a record on! The very least, I think I could n't generate a schema that confirms to the types in. For every field in the following query: 1 unified languages type ( listing all possible?.... An addition user-defined data types maps would be the idiomatic GraphQL way go. ) static method flexible and dynamic powerful way to generate the GraphQL spec says that a null on! Your own preferred medicine: it is your challenge to get these elements to meet in schema! Definition language quickly start with a special \ '' root\ '' object 2 is specific client! Use case of @ miracle2k can be solved by just using a list could! Looks different since there 's no known schema and your resolvers map except for checking for valid JSON non‐fractional... Array of objects for sending arbitrary key/value pairs aliases to query for multiple identifier, often as... That GraphQL offers are − Int − signed 32-bit Integer to schema via SDL string heart GraphQL all. Values can have clear pagination rules while maps which often have non-ordered key-value pairs are much difficult! In carrying forward a map type vs a list \ '' root\ '' object 2 can become hierarchical! To follow this pattern as well so, for example every project has a name fields! Resulting client side JSON blob against the user on the scalar types be solved by using... '' type APIs at my company to support ES6 map construction directly from JSON and mutations strings might be.. Rest APIs to return null as any of the type schema and mapping that over backing runtime data files or.
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