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content-service.js
'use strict';
var wp = require( './wp' );
var cache = require( './content-cache' );
var _ = require( 'lodash' );
var RSVP = require( 'rsvp' );
/**
* Recursively fetch all pages of a paged collection
*
* @param {Promise} request A promise to a WP API request's response
* @returns {Array} A promise to an array of all matching records
*/
function all( request ) {
return request.then(function( response ) {
if ( ! response._paging || ! response._paging.next ) {
return response;
}
// Request the next page and return both responses as one collection
return RSVP.all([
response,
all( response._paging.next )
]).then(function( responses ) {
return _.flatten( responses );
});
});
}
function siteInfo( prop ) {
var siteInfoPromise = cache.get( 'site-info' );
if ( ! siteInfoPromise ) {
// Instantiate, request and cache the promise
siteInfoPromise = wp.root( '/' ).then(function( info ) {
return info;
});
cache.set( 'site-info', siteInfoPromise );
}
// Return the requested property
return siteInfoPromise.then(function( info ) {
return prop ? info[ prop ] : info;
});
}
/**
* Get an alphabetized list of categories
*
* All archive routes display a sorted list of categories in their sidebar.
* We generate that list here to ensure the sorting logic isn't duplicated
* across routes.
*
* @method sortedCategories
* @return {Array} An array of category objects
*/
function sortedCategories() {
return all( wp.categories() ).then(function( categories ) {
return _.chain( categories )
.sortBy( 'slug' )
.value();
});
}
function sortedCategoriesCached() {
var categoriesPromise = cache.get( 'sorted-categories' );
if ( ! categoriesPromise ) {
categoriesPromise = sortedCategories();
cache.set( 'sorted-categories', categoriesPromise );
}
return categoriesPromise;
}
/**
* Get a specific category (specified by slug) from the content cache
*
* The WP API doesn't currently support filtering taxonomy term collections,
* so we have to request all categories and filter them down if we want to get
* an individual term.
*
* To make this request more efficient, it uses sortedCategoriesCached.
*
* @method categoryCached
* @param {String} slug The slug of a category
* @return {Promise} A promise to the category with the provided slug
*/
function categoryCached( slug ) {
return sortedCategoriesCached().then(function( categories ) {
return _.findWhere( categories, {
slug: slug
});
});
}
/**
* Get a specific tag (specified by slug) from the content cache
*
* The WP API doesn't currently support filtering taxonomy term collections,
* so we have to request all tags and filter them down if we want to get an
* individual term.
*
* To make this request more efficient, it uses the cached sortedTags promise.
*
* @method tagCached
* @param {String} slug The slug of a tag
* @return {Promise} A promise to the tag with the provided slug
*/
function tagCached( slug ) {
return sortedTagsCached().then(function( tags ) {
return _.findWhere( tags, {
slug: slug
});
});
}
/**
* Get an alphabetized list of tags
*
* @method sortedTags
* @return {Array} An array of tag objects
*/
function sortedTags() {
return all( wp.tags() ).then(function( tags ) {
return _.chain( tags )
.sortBy( 'slug' )
.value();
});
}
function sortedTagsCached() {
var tagsPromise = cache.get( 'sorted-tags' );
if ( ! tagsPromise ) {
tagsPromise = sortedTags();
cache.set( 'sorted-tags', tagsPromise );
}
return tagsPromise;
}
function getSidebarContent() {
return RSVP.hash({
categories: sortedCategoriesCached(),
tags: sortedTagsCached()
});
}
module.exports = {
// Recursively page through a collection to retrieve all matching items
all: all,
// Get (and cache) the top-level information about a site, returning the
// value corresponding to the provided key
siteInfo: siteInfo,
sortedCategories: sortedCategories,
sortedCategoriesCached: sortedCategoriesCached,
categoryCached: categoryCached,
tagCached: tagCached,
sortedTags: sortedTags,
sortedTagsCached: sortedTagsCached,
getSidebarContent: getSidebarContent
};
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