Basic logic to load the schema

Author: phortx

src/actions/action.ts

@@ -26,6 +26,9 @@ export default class Action {
   protected static async mutation (name: string, variables: Data | undefined, dispatch: DispatchFunction,
                                    model: Model, multiple: boolean = false): Promise<any> {
     if (variables) {
+      const context = Context.getInstance();
+      await context.loadSchema();
+
       const query = QueryBuilder.buildQuery('mutation', model, name, variables, multiple);
 
       // Send GraphQL Mutation

src/actions/fetch.ts

@@ -18,6 +18,8 @@ export default class Fetch extends Action {
    */
   public static async call ({ state, dispatch }: ActionParams, params?: ActionParams): Promise<Data> {
     const context = Context.getInstance();
+    await context.loadSchema();
+
     const model = this.getModelFromState(state);
 
     // Filter

src/actions/query.ts

@@ -23,6 +23,8 @@ export default class Query extends Action {
                             { name, multiple, filter, bypassCache }: ActionParams): Promise<Data> {
     if (name) {
       const context = Context.getInstance();
+      await context.loadSchema();
+
       const model = this.getModelFromState(state);
 
       // Filter

src/common/context.ts

@@ -5,7 +5,8 @@ import { Components } from '@vuex-orm/core/lib/plugins/use';
 import { downcaseFirstLetter } from '../support/utils';
 import Apollo from '../graphql/apollo';
 import Database from '@vuex-orm/core/lib/database/Database';
-import { Options } from '../support/interfaces';
+import {Data, Options, Schema} from '../support/interfaces';
+import { introspectionQuery } from 'graphql';
 const inflection = require('inflection');
 
 /**
@@ -61,6 +62,11 @@ export default class Context {
    */
   public apollo!: Apollo;
 
+  /**
+   * The graphql schema. Is null until the first request.
+   */
+  private schema: Schema | undefined;
+
   /**
    * Private constructor, called by the setup method
    *
@@ -111,6 +117,17 @@ export default class Context {
     return this.instance;
   }
 
+  public async loadSchema () {
+    if (!this.schema) {
+      this.logger.log('Fetching GraphQL Schema initially ...');
+
+      const result = await this.apollo.simpleQuery(introspectionQuery, {}, true);
+      this.schema = result.data.__schema;
+
+      this.logger.log('GraphQL Schema successful fetched', this.schema);
+    }
+  }
+
   /**
    * Returns a model from the model collection by it's name
    *

src/support/interfaces.ts

@@ -43,6 +43,10 @@ export interface Arguments extends Object {
   [index: string]: any;
 }
 
+export interface Schema extends Object {
+  [index: string]: any;
+}
+
 export interface Field {
   related?: ORMModel;
   parent?: ORMModel;