prismic-website/app/modules/query.js

A ready to use webserver (Express base) with utility methods for working with Prismic.io.

var logger          = require('logfmt');
var Promise         = require('promise');
var Prismic         = require('prismic.io').Prismic;

module.exports = function query(ctx, params) {
    if (!ctx.api || !ctx.ref) {
        logger.log({
            type: 'warning',
            msg:  'ctx must include a reference and Prismic API'
        });
        return false;
    }

    var limit = params.limit || 20;
    var sort = params.sort || false;

    var predicate = null;

    if (params.type) {
        if (typeof params.type === 'string') {
            predicate = Prismic.Predicates.at('document.type', params.type);
        }
        if (params.type instanceof Array) {
            predicate = Prismic.Predicates.any('document.type', params.type);
        }
    }

    if (params.id && predicate === null) {
        if (typeof params.id === 'string') {
            predicate = Prismic.Predicates.at('document.id', params.id);
        }
        if (params.id instanceof Array) {
            predicate = Prismic.Predicates.any('document.id', params.id);
        }
    }

    if (predicate === null) {
        logger.log({
            type: 'warning',
            msg:  'Missing query type or id'
        });
        return false;
    }

    return new Promise(function (resolve, reject) {
        var request = ctx.api.form('everything')
            .ref(ctx.ref)
            .query(predicate)
            .pageSize(limit);

        if (sort) {
            request.orderings(sort);
        }

        request.submit(function(err, response) {
            if (err) {
                return reject(err);
            }
            resolve(response);
        });
    });
}