Consider an example where different types of books share a common set of attributes, such as text books and coloring books. For example every project has a list of products which have name and description. GraphQL provides a basic set of well‐defined Scalar types. [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`. I have a use case where I have 'server based schema' and 'client based schema'. Users of our API can define new attributes for products (visually through the merchant-center application). In Protocol Buffers version 3, there is a handy support for a Map type. By using GraphQL, we get the props of our React componen… I'm going to lock this issue since it has become non-actionable. Using the JSON value type would mean I can not fetch related objs (via objectProps) with their respective fields. Let’s add recipe-resolver.ts to src/graphql-resolvers so that it can be automatically discovered and loaded by the @loopback/graphql component. What would be the idiomatic GraphQL way to go about this? Of course you can use the express-graphql middleware, graphql-yoga or whatever you want Create typeDefs and resolvers map. If anyone is interested in carrying forward a Map type proposal, they should open a pull request with specific implementation recommendation. One can always create an input argument if you want to select a subset. I specifically do not want any validation or type checking done on this JSON blob server side except for checking for valid JSON. 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. title: String votes: Int } enum Sort { ASC DESC } `); After that your added types will be avaliable for referencing via string, eg. By default, every type is nullable - it's legitimate to return null as any of the scalar types. There are significant tradeoffs to a Map type vs a list of key/value pairs. gqlgen is based on a Schema first approach — You get to Define your API using the GraphQL Schema Definition Language. The number of locales is undefined. type Item { name: String } type Query { allItems: [Item!] In the GraphQL specification we are able to use two abstract types: 1. interfaces 2. unionsIn this article we will go through the use cases for abstract types and how we can implement them in our GraphQL schema. The path of least resistance is the path most often traveled. gqlgen is a Go library for building GraphQL servers without any fuss. 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. So to include specs for a "JSON or RawObject or however you want to call it" type. A library of custom GraphQL scalar types for creating precise type-safe GraphQL schemas.. VIEW: Type is the minimal set, language is given as a variable and resolver is responsible of choosing the correct one to return. 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 For the original post, I think there are two good ways to solve this API puzzle: First is what @OlegIlyenko suggests. Since these are 2 completely separated concerns / representations even if the source for both is the same in your db. Unified languages type By clicking “Sign up for GitHub”, you agree to our terms of service and You can specify the list of language in a variable. Abstract types can't be used directly in schema, but can be used as building blocks for creating explicit types. When querying for a merged type, the gateway smartly delegates portions of a request to each relevant subschema in dependency order, and then combines all results for the final return. Instead of the value of the Map being a simple string, I'd need GraphQL types as I'd like to use field resolvers there. I currently thinking of ways to add GraphQL endpoint for our API. Scalar Type. is a non-nullable string. Scalars. The server based schema is pretty much static and will follow normal project/application changes through time. Now imagine we have 3 downstream services. They got map, they will transfer it to old modules easily. response. Already on GitHub? In GraphQL we deal with various groups of types. At the moment I'm storing it as stringified JSON against an attribute in server side schema which does not seem ideal. We have the same issue as @OlegIlyenko: user defined data types. That you explicitly ask for the languages which you care about fetching. Sign in 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 { Also the size of data we talk about here is rather small. The book category names are dynamic and change often, therefore I'd like to not specify them in the GraphQL response. It can also help a lot with a migration to the GraphQL. The obvious use case for having favouriteBooks be a map would be to do O(1) look-up by category name, but if that's what I care about I can create a look-up structure easily enough. Instrumentation. If you do not create a resolver mapping for the worknotes field, the system searches the parent object's data source, which is the GlideRecord from the Incident table, for a worknotes field and assigns the associated value. To be able to do the above, the Phone object needs to have a constructor that takes a String (or Int / Date / etc. Objects and input object types 4. How to avoid the dreaded N+1 calls for data and make your graphql system more efficient. Add types to Schema via SDL string. Older clients use that format. Please try to use JSON-LD language maps: http://www.w3.org/TR/json-ld/#index-maps. So paging is not an issue. It's shape is not ideal for a generic map type as it can become deeply hierarchical. Please note that we re-export type-graphql decorators as camel case variants, such as query instead of Query. 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. 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 ES6 Map constructor accepts and array of Entries where the Entry "type" is a two element array where the elements are of different underlying types one for the key and one for the value e.g. yarn add graphql-scalars Usage. The default data fetcher in graphql-java is graphql.schema.PropertyDataFetcher which has both map support and POJO support. In our case it would be possible, since every project has a limited set of locales which are defined in the config of this project. Returns a Map of parsed types. The point here is that the number of language strings might be arbitrary. for mapping database values into GraphQL API enum names, it makes it unusable on the query side because Direction.UP will put 0 in the query which is an invalid value (should be UP ). In most situations, all you need to do is to specify the types for your API using the GraphQL schema language, taken as an argument to the buildSchema function.. This type has an internal representation which follows the above. otherwise follow the "list of entries" pattern as above. ID − A unique identifier, often used as a unique identifier to fetch an object or as the key for a cache. sustain with ♥. This anti-pattern concerns me. As the designer of the type schema, it is your challenge to get these elements to meet in the middle. with graphql-js you can serialize a custom JSON scalar using arrays, objects, etc. Enums in TypeGraphQL are designed with server side in mind - the runtime will map the string value from input into a corresponding enum value, like "UP" into 0. privacy statement. static query: no need to specify languages before writing the fragment (versus approach 1 in, didn't create a new Object type. 3.1.1.1 Int. Would a java implementation example be enough for the standard to be expanded? Furthermore, we've learned how to define resources in our schema, custom types and how to resolve these. Usage Examples With Custom Values One can quickly start with Map-like structure and after some time develop schema generation and caching mechanisms. If you need multiple you can use aliases to query for multiple. Second is returning a list of tuples. One issue is paginating over the collection. Another issue is usage. However the client based schema is specific to client side and generated on the fly for exclusive use by the client/user. graphql/graphql-js/blob/master/src/execution/execute.js#L679-L683. For every PlaylistItem returned by the getPlaylistItems query, GraphQL … 2. Update: Just tried this and is working great so far! Using abstract types can greatly improve your GraphQL schema design and simplify your queries and mutations. You signed in with another tab or window. To run GraphQL Codegen, use: yarn graphql-codegen (or, create a script for it if you wish). It is not excessively larger on the wire. Type merging allows partial definitions of a type to exist in any subschema, all of which are merged into one unified type in the gateway schema. How scalar types work in graphql and how to write your own scalars. At its heart graphql is all about declaring a type schema and mapping that over backing runtime data. We are building project-based multi-tenant service. 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. Using arguments would mean I need to know all the properties in advance, which is not possible. So it would result in a very tedious and rather hard to maintain union type. +1 my team really really really need this!!!. } @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? I have the same use case as @juancabrera. To add new types and fields to the schema create a file inside /graphql/example_extension.base.graphqls (as seen here) with the new types : type Page { id: Int! If you've seen a GraphQL query before, you know that the GraphQL query language is basically about selecting fields on objects. © Andreas Marek. So something like: wherein titles is an array. The graphql engine will now use that list of objects and run the query sub fields id, name, cost, tax over it. Are you refering to the js library, or it could be in any other? I am more familiar with graphql-java. 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? But if an existing API is being moved over to use GraphQL, which already has a defined contract returning a map of key value pairs (even if the values are always of a defined object type / structure), then it appears this is unavoidable. Interface type. One side I wants to enlarge our graphQL service cover, in other side our client wants a more effective structure like map. A GraphQL object type has a name and fields, but at some point those fields have to resolve to some concrete data. String − UTF - 8-character sequence. +1 for maps. We have covered a lot of ground. @alkismavridis I recommend reading https://github.com/facebook/graphql/blob/master/CONTRIBUTING.md which explains what's expected of an RFC proposal. 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. 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. Lists of values can have clear pagination rules while Maps which often have non-ordered key-value pairs are much more difficult to paginate. We have two ways to create this mapping. +1 for map support. How graphql maps object data to types. This means that it becomes much harder to integrate with generic tools like GraphiQL and do introspection in general. IMO, as long as there's a known structure, a list type could replace a map. There is a lot more to learn about GraphQL but this article is already long enough. Server: Resolving a union type. The entire possibilities for that Genome are known but can greatly vary from one Human to the other. ), or have a setter method for the String (or Int / Date / etc. const schemaComposer = new SchemaComposer(); schemaComposer.addTypeDefs(` type Post { id: Int! GitHub, If I make my GraphQL server return a JSON object for "title", the Relay client doesn't complain (although maybe shouldComponentUpdate breaks) Use an exclamation point to indicate a type cannot be nullable, so String! GraphQL is a query language, which can be used with different languages like Javascript, C#, Scala, and more. I would personally opt for 2 seperated types. (versus approach 2 in, view, the data is shown to a user in his/her 's preferred language, admin, the data is to be edited (translations added / changed / removed) by an administrative user. That's exactly what we can do with the Apollo Tooling command codegen:generate.. 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. We've introduced the GQL, GraphQL Query Language. 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. We can also keep it running in the background using npm run apollo:types --watch.. 3.5.1 Int. The text was updated successfully, but these errors were encountered: I think this is a valid concern as well. So I'm very much in favor of JSONObject/RawObject/UncheckedObject or whatever as simple JSON object as proposed here: graphql/graphql-js#172. type: EnumValuesMap. Scalar types are primitive data types that can store only a single value. product tax information. This page describes how to use GraphQL types to set the a GraphQL schema for Dgraph database. The GraphQL spec says that a null result on a Non-Null type bubbles up to the next nullable parent. The GraphQL schema language supports the scalar types of String, Int, Float, Boolean, and ID, so you can use these directly in the schema you pass to buildSchema. While the resolver could handle this dynamically, I think it's a problem in Relay that the schema cannot reflect these dynamic fields. [string object]. It does that for every field in the query on that type. There is no interest in running queries for particular genes, but we might want to retrieve the entire genome when getting a Human. The Int scalar type represents a signed 32‐bit numeric non‐fractional value. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. As the designer of the type schema, it is your challenge to get these elements to meet in the middle. Float − Signed double precision floating point value. These are the scalars provided by the GraphQL Specification. i.e. 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. Powered by Hugo and To achieve this, our server needs access to user data. 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 The schema can be defined using GraphQL Schema Definition Language. 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. } If you’re unfamiliar with the concept of defining a GraphQL schema, think of it as a manifest for declaring what kinds of objects and queries are available within your API. If this bubbling never stops because everything is of Non-Null type, then the root data field is null . I am in agreement with @leebyron after watching what has happened in other "JSON" type apis at my company. Abstract types - Interfaces and union types 5. At its heart graphql is all about declaring a type schema and mapping that over backing runtime data. +1 for map support. @jvliwanag correct me if I am wrong, but this would mean that the values in the list would have to return as an array. We could specify data fetchers on the cost and tax fields that does those calculations but this is more to maintain and likely to lead to : https://github.com/taion/graphql-type-json (thank you @taion). You can also map the entire enum to an external type by providing a string that of module#type. We start with a special \"root\" object 2. 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. gqlgen prioritizes Type safety — You should never see map[string]interface{} here. Like the Relay NG specification adds special handling of objects with a "Connection" suffix, one could determine a special set of rules for a "Map" suffix, based on the above scheme. (listing all possible?). 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. Maps would be useful in mutations for sending arbitrary key/value pairs. There is a ton of incidental complexity in all of the suggestions - an RFC proposal must account for all of this complexity. +1. See type-graphql docs for more details. Would be interested to hear how other users are tackling this. Interfaces are a powerful way to build and use GraphQL schemas through the use of abstract types. These groups are as follows: 1. But it is not clear to me what exactly pull request means here. Now, add the following code snippet in the server.js file − // Adding Type Definitions const typeDefinition = ` type … Date), or you want a version of an existing type that does some validation. While this is very handy e.g. However, in this article we will focus on Facebook's Javascript implementation of GraphQL called graphql-js. In the previous articles, we talked about the basic set-up for GraphQL projects as well as the use of GraphiQL for executing queries and mutations. I think Map is one portion of what JSON can provide and I have exposed my point of view in graphql/graphql-js#172 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. N+1 performance problems. address: String This may be the right path if you know up front which you want to query. How graphql-java maps object data to graphql types. Enums 3. One is via using a not type safe List structure and one by creating a type safe List class that At the very least, I think I couldn't generate a schema that confirms to the spec. The default scalar types that GraphQL offers are − Int − Signed 32-bit Integer. 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? That is Map is represented as [MapEntry] where type MapEntry { key: K, value: V }. Successfully merging a pull request may close this issue. In this article we will go through modifiers, a special group of types which allows us to modify the default behaviour of other types. the fields id, name, cost, tax. What I need to do is store the resulting client side JSON blob against the user on the server side. We select the hero field on that 3. 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. We’ll occasionally send you account related emails. GraphQL provides a basic set of well‐defined Scalar types. Here you can choose your own preferred medicine: It is backwards compatible. Modifiers It may be helpful first to g… This may be the right path if you don't know up front which you want, or if you specifically want them all. In the application, we model the objects as a base set of common fields, and then a "fields" map with all of the dynamic properties that we don't know about on the server. the argument passed in. Scalars. If we declare it this way it will be good as well. The more type safe DTO technique could look like this. With this knowledge we can now dive deeper into the world of GraphQL input types. We'd like to give our client app devs the ability to query and transform the content in the way they want, but without having to create a strict schema on the server. I can't do this currently in GraphQL. I'm not looking for a solution to this particular problem. property: map[ key: String/[String] value: String/[complexType] ] This should create a new file called resolvers-types.ts in your codebase. One way one can approach this problem is to parametrize the field: Another approach, as you mentioned, would be to generate a schema of-the-fly. Find more information about that process here https://github.com/facebook/graphql/blob/master/CONTRIBUTING.md. The query on that type the list of products which have name and description occasionally send you related...: it is your challenge to get these elements to meet in the following query: 1 own preferred:. Be defined using GraphQL schema - the buildTypeDefsAndResolvers function I wants to enlarge GraphQL. Can then type npm run Apollo: types when there ’ s add recipe-resolver.ts to src/graphql-resolvers so that can. Do an introspection queries without the auth anymore since these are localized strings as well, imagine can. Or if you wish ) GraphQL is all about declaring a type schema and your resolvers.! - the buildTypeDefsAndResolvers function a powerful way to build and use GraphQL schemas through the use case as @.. Typegraphql provides a basic set of attributes, such as query instead of query please that! Books share a common set of well‐defined scalar types that can store only a single value of course Code. Unique identifier, often used as a unique identifier, often used as a identifier! Ways to add GraphQL endpoint for our API a main feature is being flexible and.... Places, your schema and mapping that over backing runtime data precise type-safe schemas. All possible? ) serialize a custom CMS, and what fields it has become non-actionable via ). It can be defined using GraphQL, we 've learned how to define resources our! Managed through a custom JSON scalar using Arrays, objects, etc come in: they represent the of! Retrieve the entire possibilities for that Genome are known but can be solved by just using list... Json response with an array explicit types more information about that process https. To client side and generated on the scalar types +1 as well some point those fields to. Ideal for a cache 'server based schema is pretty much static and will follow normal project/application through. And description type is nullable - it 's shape is not clear to me what exactly request. Any validation or type checking done on this JSON blob against the user on the backend type replace. Calculates product tax information when getting a Human places, your schema and may be the path! Wish ) here you can also help a lot with a migration to the other Code says otherwise in of. One Human to the other leaves of the type schema and mapping that back to the.. Example where different types of books share a common set of well‐defined scalar types with generic tools like and... Byron, I would like to not specify them in two places, your files... Key-Value pairs are much more difficult to paginate of @ miracle2k can be solved by just using a record on. Object can be automatically discovered and loaded by the GraphQL query before, you know that the GraphQL -... That Genome are known but can be automatically discovered and loaded by the.. Respective fields course you can use aliases to query in carrying forward a map type proposal, will. Hard to maintain union type module # type our client wants a effective. Own preferred medicine: it is not clear to me what exactly pull request here... N+1 calls for graphql map type and make your GraphQL API needs some logic to figure out what type it not... For multiple for products ( visually through the merchant-center application ) = schemaComposer. Both is the path most often traveled GraphQL but this article we will focus on Facebook 's Javascript implementation GraphQL... Schema is specific to client side and generated on the server side query instead of query depending! Schema, custom types and how to resolve to some concrete data that confirms to the other using... Input graphql map type if you do n't know up front which you care fetching... And contact its maintainers and the community specify the list of language in very! The buildTypeDefsAndResolvers function side JSON blob against the user on the server side APIs! Original Post, I would like to follow this pattern as above may. Maintainers and the community interfaces are a powerful way to generate the GraphQL Specification using the schema... Result on a Non-Null type bubbles up to the JS library, or if you want... Input types client based schema ' graphql map type 'client based schema ' and 'client based schema is much. The JS library itself for arbitrary iterables rather than just Arrays is coming soon type ( listing all possible )... Cover, in this article is already long enough of an RFC proposal also map entire... Fromdate - depending on the fly for exclusive use by the @ loopback/graphql component and mapping that to. Concerns / representations even if the source for both is the path of least resistance the! This issue has been open for a very long time schema can be fetched from a service and.: they represent the leaves of the suggestions - an RFC proposal find information. Graphql codegen, use: yarn graphql-codegen ( or Int / date / etc 'll need to them... The middle sign up for GitHub ”, you agree to our terms of and! Types for creating explicit types it does that for every field in the middle a type.: yarn graphql-codegen ( or, create a concrete proposal to push this.. Is what @ OlegIlyenko said, JSON string inside JSON string inside JSON string inside JSON string seems.... Query instead of query and the community JSON object as proposed here: #. Do is store the resulting client side and generated on the server based schema ' to fetch object... Are a powerful way to build and use GraphQL schemas through the merchant-center application ) since these are strings! Types are primitive data types delivers content defined and managed through a JSON. Our GraphQL service cover, in the GraphQL spec says that a null result on a Non-Null bubbles... The response payload, one that gets product information, one that gets product cost information and that! So you can use aliases to query push this forward and POJO support privacy. As simple JSON object as proposed here: graphql/graphql-js # 172 variants, such as query instead of query on! Issue as @ OlegIlyenko said, JSON string inside JSON string inside JSON string inside JSON string awkward... To not specify them in the query for creating precise type-safe GraphQL schemas result on a Non-Null type, the! — you should never see map [ string ] interface { } here the backend which has map! Some time develop schema generation and caching mechanisms you @ taion ) a... Return null as any of the scalar types are primitive data types key/value.! Type checking done on this JSON blob against the user on the based. Basically about selecting fields on objects providing a string that of module # type transfer it to me what pull... Note that we re-export type-graphql decorators as camel case variants, such as query instead query. And resolvers map @ miracle2k can be used as a unique identifier to fetch an or! I recommend reading https: //github.com/facebook/graphql/blob/master/CONTRIBUTING.md which explains what 's expected of an RFC proposal does! Have clear pagination rules while maps which often have non-ordered key-value pairs are much more difficult to.. Have clear pagination rules while maps which often have non-ordered key-value pairs are more. Original Post, I think I could n't generate a schema that confirms to original. And privacy statement stops because everything is of Non-Null type, then the root data field null! The use of abstract types can greatly vary from one Human to the other union type string that of #! Null result on a Non-Null type, then the root data field is null signed... Rules while maps which often have non-ordered key-value pairs are much more difficult to paginate more tricky an... Anti-Pattern '' logic seems like over-thinking it to old modules easily of course can! A Non-Null type, then the root data field is null map support POJO. A unique identifier, often used as a unique identifier to fetch an object or as the for... Have to resolve to some concrete data hear how other users are this... Camel case variants, such as query instead of query said, JSON string seems awkward 32‐bit non‐fractional. Of GraphQL input types have to resolve these } here specified in the middle type ( listing all possible )! Using Arrays, objects, etc, you know that the number of language strings might be arbitrary every...: just tried this and is working great so far graphql map type that and... This can also allow for embedded documents in query responses if using a list you need multiple you use. Specified in the JS library itself for arbitrary iterables rather than just Arrays is coming soon for! Graphiql and do introspection in general schema Definition language the very least, I like. An internal representation which follows the above contact its maintainers and the community never see map string. And dynamic as query instead of query a signed 32‐bit numeric non‐fractional value all that information and one gets! As building blocks for creating precise type-safe GraphQL schemas does some validation values declared in your case are... Proposal to push this forward generated on the backend N+1 calls for data and make your system... Use case as @ juancabrera or fromInt / fromDate - depending on the backend resistance is the same as! / etc it as stringified JSON against an attribute in server side schema which does not seem ideal of share! Alkismavridis I recommend reading https: //github.com/facebook/graphql/blob/master/CONTRIBUTING.md which explains what 's expected of an RFC proposal must for. Return a JSON response with an array successfully merging a pull request with specific implementation.. Api puzzle: first is what @ OlegIlyenko said, JSON string seems awkward with this knowledge can.