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EXPLANATION-request-example.md

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Lifecycle of a request

This traces an example in the code of how different parts are linked together.

The example comes from the 'first' step, which is consuming an invite code, to login.

Connecting to /invite/abc-123

  1. Loaded from src/server/index.js (app.use(appRenderer)) => src/server/middleware/app-renderer.jsx (const routes = makeRoutes(authCheck)) => src/routes.jsx you will see <Route path='invite/:inviteId' component={CreateOrganization} ...

  2. This loads src/containers/CreateOrganization.jsx

  3. which while loading calls inviteData and userData which will call getInvite and getCurrentUser through graphql api

  4. The client then makes an xmlhttprequest to /graphql with the following payload:

{"debugName":"___composed","query":"query ___composed($___getInvite___requestIndex_0___inviteId: String!) {\n  ___getInvite___requestIndex_0___fieldIndex_0: invite(id: $___getInvite___requestIndex_0___inviteId) {\n    id\n    isValid\n  }\n  ___getCurrentUser___requestIndex_1___fieldIndex_0: currentUser {\n    id\n  }\n}\n","variables":{"___getInvite___requestIndex_0___inviteId":"abc-123"}}

  1. GraphQL 'schema' is defined in src/server/api/schema.js where you will see currentUser and invite defined there. Those definitions magically (via type RootQuery in that file) make getCurrentUser and getInvite exist. See rootResolvers =... in the file for the code that will run on e.g. getInvite under the invite: key.

  2. After authenticating the user with authRequired(user), it "loads" the invite. The first argument of load(id) is presumed to map to the id field, because TKTK??? probably it's defined through src/server/api/invite.js

  3. Assuming that an invite is found with id=abc-123 and the user is authenticated, the graphql returns this info to the client.

  4. Back in CreateOrganization.jsx, with the data now loaded, React renders the container, which runs renderForm() and displays the form to create an organization to the user.

  5. When the user fills out the organization name field and clicks submit, it then runs onSubmit for the GSForm and calls mutations.createOrganization with the form values as arguments, again through GraphQL.

  6. We circle back (through another XHR request go /graphql) into src/server/api/schema.js and call createOrganization with the same arguments listed in the jsx file.

  7. In schema.js rootMutations has a createOrganization method which is called and it runs (after revalidating the invite id and user) Organization.save(...) -- Organization, in this case is a model (see the import at the top) and is defined in src/server/models/organization.js.