xtuple-query

Create, validate, and translate various forms of XT datasource query object.

0. Concept

xTuple client applications send payload objects to the xTuple server in order to communicate. This API is concerned with properly setting the value of payload.query.

The xtuple datasource accepts queries from the following avenues:

• REST
• socket.io
• internal (programmatically)

They can be of different types:

• parameterized selector
• free-text search
• dispatch function invocation
• etc?

This library unifies these client and server-side concerns with a simple API that exposes exactly two methods: isValid() and toTarget().

1. Usage

The objects in this API can be thought of as being isometric to the payload.query property and each other, in that they are all one translation away from being equivalent.

Each Query type defines a template which validates its constructor input according to set rules.

A. Server Side

The REST router uses descendants of the SourceQuery type to validate and translate incoming queries. Consider:

1. Client creates a select query on some type:

    query: {
      query: {
        'customer.number': {
          EQUALS: 'TTOYS'
        },
        amount: {
          LESS_THAN: 7500
        }
      },
      orderby: {
        amount: 'desc'
      },
      maxresults: 5
    }

2. Client issues a GET request to the server of the form:

    api/v1alpha1/sales-order/?query[customer.number][EQUALS]=TTOYS&query[amount][LESS_THAN]=7500

3. The server validates the integrity of the request:

    var source = new RestQuery(req.query),
      target;
    if (!query.isValid()) {
      error = restQuery.getErrors();
      return res.json(error.error.code, error);
    }

4. The server translates the client request into a form accepted by the datasource and executes the query. The target forms are of type TargetQuery. In this case, XtGetQuery objects are accepted by xt.get().

    payload.query = source.toTarget(XtGetQuery);
    db.query('get', payload);

B. Client Side

• TODO document