feat: Implement get flow graphQL query

packages/backend/src/graphql/queries/get-flow.ts

@@ -0,0 +1,29 @@
+import { GraphQLNonNull, GraphQLString } from 'graphql';
+import Flow from '../../models/flow';
+import RequestWithCurrentUser from '../../types/express/request-with-current-user';
+import flowType from '../types/flow';
+
+type Params = {
+  id: number
+}
+
+const getFlowResolver = async (params: Params, req: RequestWithCurrentUser) => {
+  const flowParams = { user_id: req.currentUser.id, id: params.id }
+
+  const flow = await Flow.query()
+    .withGraphFetched('steps')
+    .findOne(flowParams)
+    .throwIfNotFound();
+
+  return flow;
+}
+
+const getFlow = {
+  type: flowType,
+  args: {
+    id: { type: GraphQLNonNull(GraphQLString) },
+  },
+  resolve: (_: any, params: Params, req: RequestWithCurrentUser) => getFlowResolver(params, req)
+}
+
+export default getFlow;

packages/backend/src/graphql/root-query.ts

@@ -4,6 +4,7 @@ import getApp from './queries/get-app';
 import getConnectedApps from './queries/get-connected-apps';
 import getAppConnections from './queries/get-app-connections';
 import testConnection from './queries/test-connection';
+import getFlow from './queries/get-flow';
 import getFlows from './queries/get-flows';
 
 const rootQuery = new GraphQLObjectType({
@@ -14,6 +15,7 @@ const rootQuery = new GraphQLObjectType({
     getConnectedApps,
     getAppConnections,
     testConnection,
+    getFlow,
     getFlows
   }
 });

packages/backend/src/graphql/types/flow.ts

@@ -1,10 +1,14 @@
-import { GraphQLObjectType, GraphQLString } from 'graphql';
+import { GraphQLList, GraphQLObjectType, GraphQLString } from 'graphql';
+import StepType from './step';
 
 const flowType = new GraphQLObjectType({
   name: 'Flow',
   fields: {
     id: { type: GraphQLString },
-    name: { type: GraphQLString }
+    name: { type: GraphQLString },
+    steps: {
+      type: GraphQLList(StepType),
+    }
   }
 })
 

packages/backend/src/graphql/types/step.ts

@@ -3,6 +3,7 @@ import { GraphQLObjectType, GraphQLString, GraphQLNonNull, GraphQLEnumType, Grap
 const stepType = new GraphQLObjectType({
   name: 'Step',
   fields: {
+    id: { type: GraphQLString },
     key: { type: GraphQLNonNull(GraphQLString) },
     appKey: { type: GraphQLNonNull(GraphQLString) },
     type: {