When we show a random article in the feed, we request a few random titles and sort by various criteria to show the "best" one.
When the api returns article data it can usually tell us whether a random title is a disambiguation page, such as when we get data for the "enwiki > anona" article:
https://en.m.wikipedia.org/w/api.php?action=mobileview&format=jsonfm&page=anona§ions=1&prop=text%7Cpageprops%7Cdescription&pageprops=*
```
{
"mobileview": {
"pageprops": {
"disambiguation": "",
"wikibase_item": "Q20996443"
},
"sections": [
{
"id": 1,
"text": "<h2><span class=\"mw-headline\" id=\"See_also\">See also</span><span><a href=\"#/editor/1\" title=\"Edit section: See also\" data-section=\"1\" class=\"mw-ui-icon mw-ui-icon-element mw-ui-icon-edit-enabled edit-page icon-32px\">Edit</a></span></h2>\n<ul>\n<li><a href=\"/wiki/Annona_(disambiguation)\" title=\"Annona (disambiguation)\" class=\"mw-disambig\">Annona (disambiguation)</a></li>\n</ul>\n<table id=\"disambigbox\" class=\"metadata plainlinks dmbox dmbox-disambig\" style=\"\" role=\"presentation\">\n<tr>\n<td class=\"mbox-image\" style=\"padding: 2px 0 2px 0.4em;\"><a href=\"/wiki/File:Disambig_gray.svg\" class=\"image\"><img alt=\"Disambiguation icon\" src=\"//upload.wikimedia.org/wikipedia/en/thumb/5/5f/Disambig_gray.svg/30px-Disambig_gray.svg.png\" width=\"30\" height=\"23\" srcset=\"//upload.wikimedia.org/wikipedia/en/thumb/5/5f/Disambig_gray.svg/45px-Disambig_gray.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/5/5f/Disambig_gray.svg/60px-Disambig_gray.svg.png 2x\" data-file-width=\"220\" data-file-height=\"168\" /></a></td>\n<td class=\"mbox-text\" style=\"padding: 0.25em 0.4em; font-style: italic;\">This <a href=\"/wiki/Help:Disambiguation\" title=\"Help:Disambiguation\">disambiguation</a> page lists articles associated with the title <b>Anona</b>.<br />\n<small>If an <a class=\"external text\" href=\"//en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Anona&namespace=0\">internal link</a> led you here, you may wish to change the link to point directly to the intended article.</small></td>\n</tr>\n</table>"
}
]
}
}
```
Note **//"disambiguation": ""//** page prop is present in the result above, which is correct.
However, sometimes the api messes up and doesn't include the "disambiguation" key, as is the case with "enwiki > HMS Dauntless":
https://en.m.wikipedia.org/w/api.php?action=mobileview&format=jsonfm&page=HMS%20Dauntless§ions=1&prop=text%7Cpageprops%7Cdescription&pageprops=*
```
{
"mobileview": {
"pageprops": {
"displaytitle": "HMS <i>Dauntless</i>",
"defaultsort": "Dauntless, Hms",
"wikibase_item": "Q5632089"
},
"description": "Wikipedia disambiguation page",
"sections": [
{
"id": 1,
"text": "<h2><span class=\"mw-headline\" id=\"In_popular_culture\">In popular culture</span><span><a href=\"#/editor/1\" title=\"Edit section: In popular culture\" data-section=\"1\" class=\"mw-ui-icon mw-ui-icon-element mw-ui-icon-edit-enabled edit-page icon-32px\">Edit</a></span></h2>\n<ul>\n<li>In the 2003 film <i><a href=\"/wiki/Pirates_of_the_Caribbean:_The_Curse_of_the_Black_Pearl\" title=\"Pirates of the Caribbean: The Curse of the Black Pearl\">Pirates of the Caribbean: The Curse of the Black Pearl</a></i>, the fictional HMS <i>Dauntless</i> appears as the flagship and pride of the <a href=\"/wiki/Royal_Navy\" title=\"Royal Navy\">Royal Navy</a>.</li>\n</ul>"
}
]
}
}
```
Note **//"disambiguation": ""//** page prop is missing in the result above, which is incorrect and the cause of the bug.
Best fix: So we need to file an upstream ticket for this
Work-around: In the mean time we could set "isDisambiguation" to YES if //either// the server response has the "disambiguation" page props key, //or// if the wiki data description contains the string "disambiguation page".