Sorting Schema

The implementation of a GraphQL Service requires a certain structure to follow for Slickgrid-Universal to work correctly (it will fail if your GraphQL Schema is any different than what is shown below).

Implementation

For the implementation in your code, refer to the GraphQL Service section.

orderBy

The sorting uses orderBy as per this GitHub Suggestion of a Facebook employee. The query will have a orderBy argument with an array of filter properties:

• orderBy: array of sorting object(s) (see below)

  • field: field name to sort

  • direction: a GraphQL enum (server side) that can have 1 of these choices:

    • ASC, DESC

Note: the orderBy order is following the order of how the filter objects were entered in the array.

For example

users (first: 20, offset: 10, orderBy: [{field: lastName, direction: ASC}, {field: firstName, direction: DESC}]) {
  totalCount
  nodes {
    name
    firstName
    lastName
    gender
  }
}

Complex Objects

Dealing with complex objects are a little bit more involving. Because of some limitation with our GraphQL for .Net implementation, we decided to leave field as regular strings and keep the dot notation within the string. For that behavior to work, a new keepArgumentFieldDoubleQuotes property was added that can be passed to the GraphQL initOptions() function. For example, given a complex object field (defined in the Column Definition) that is field: "billing.street" will give this GraphQL query (if you have keepArgumentFieldDoubleQuotes set to True).

Grid Definition example

import { GraphqlService, GraphqlPaginatedResult, GraphqlServiceApi, } from '@slickgrid-universal/graphql';

export class Sample {
  prepareDatagrid(private graphqlService: GraphqlService ) {
    this.columnDefinitions = [
      { id: 'name', name: 'Name', field: 'name', filterable: true, sortable: true },
      { id: 'company', name: 'Company', field: 'company', filterable: true },
      { id: 'billingStreet', name: 'Billing Address Street', field: 'billing.address.street', filterable: true, sortable: true },
      { id: 'billingZip', name: 'Billing Address Zip', field: 'billing.address.zip', filterable: true, sortable: true },
    ];

    this.gridOptions = {
      backendServiceApi: {
        service: new GraphqlService(),
        process: (query) => this.userService.getAll<Customer[]>(query),
        options: {
          columnDefinitions: this.columnDefinitions,
          datasetName: 'customers'
        }
      }
    };
  }
}

GraphQL Query

// the orderBy/filterBy fields will keep the dot notation while nodes are exploded
{
  users(first: 20, offset: 0, orderBy: [{field: "billing.address.street", direction: ASC}]) {
    totalCount,
    nodes {
      name,
      company,
      billing {
        address {
          street,
          zip
        }
      }
    }
  }
}

From the previous example, you can see that the orderBy keeps the (.) dot notation, while the nodes is exploded as it should billing { street }}. So keep this in mind while building your backend GraphQL service.