graphql-apollo | GraphQL library

I try to implement the Search function into my management system using React-Hooks and GraphQL-Apollo Client. While the interface is shown successfully, when I press the 'Search' button it came out an error which named:

Invalid hook call. Hooks can only be called inside of the body of a function component.

I'm pretty sure the useQuery is being called inside a function, so I do not understand what will cause this. The other function such as display all users and add new users are working fine.

I have tried a couple of ways to implement the search function and search around online while still couldn't get it solve. This is my first time encounters React-Hooks too.

Here is my current code in the searchUser component

I started to learn nestjs and tried this example with graphql.

But the example was written for apollo-server version 1 and now I have problems to get it working with apollo-server version 2. Currently it is not clear to me how to get the apollo-server version 2 into the consumer:

I'm reading a blog to separate graphql schemas and resolvers by domain.

To merge the resolvers, it makes sense.

Apollo query has the wrong data from cache in my react app.

If I set query's fetchPolicy to 'network-only', everything work properly.

So I think it is a cache problem.

I have been working hard trying to solve the problem and see articles about apollo cache, but I still can't solve the problem.

Here are my results after querying:

parameter memberId is null (result is correct)

I am using the schema stitching (as demonstrated here) in a typescript express app.

Creating resolvers in different files seems to create build issues. However, creating resolvers in app.ts (as shown below) is fine.

I have configured and set up a fully functional express-nextjs-graphql-apollo app that can login/logout a user, and perfectly do CRUD. The last and very important step is to display error messages on client-side.

So far, I'm only getting this red error in a console: POST http://localhost:3000/graphql 500 (Internal Server Error)

For example, a login form validation. When no input is provided, it's supposed to get an invalid input error message, or E-Mail is invalid if email format is incorrect.

The following mutation code tested in graphql localhost:3000/graphql:

I am using Nodemon and ESM module to use ES6 syntax on a Express + Mongoose project. I am getting this error when compiling:

SyntaxError: The requested module 'file:///.../models/User.js' does not provide an export named 'User'

My model file (models/User.js) looks like this:

Thanks to the package @nestjs/graphql I can create separate .graphql files in each module of my application and the Nestjs system gathers them all and introduces them to Apolo server well, but the problem comes when I try to make custom scalars, I do them as is his tutorial says:

https://docs.nestjs.com/graphql/scalars

But I can not find a way to import them into a .graphql file so I could use it within that file. and since the file is .graphql the import does not work. Do you know how I can import a custom scalar to be used within a .graphql file? Something that can serve as an example is an example that they use:

https://github.com/nestjs/nest/tree/master/sample/12-graphql-apollo

As you can see them in their example they expose that they have a module called cats, where inside the module they have their cats.resolvers.ts and their cats.graphql; and on the other hand, they have their date.scalar.ts defined. The question using this example:

What should I do to use the DateScalar in a property of cats.resolvers.ts?

Ok. I officially lost my mind with this problem.

Let's take a default Rails application (5, but I tried also with a 4 default app).

I'm trying to use a simple javascript code to send an ajax POST request to one controller action.

In my ApplicationController I have this code: