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How to use relationship info to find feature layers in web map service?

NickToscano

In the docs it says:

" You may add one or more layer items to compose a web map or web scene item. Whenever you perform such an operation, you establish a relationship between the items."

I take this to mean that each web map should have a relationship to any layers that have been added to it.

However it seems that if I try to check a map that has a single feature layer, and a publicly hosted basemap I always get the following error for both dependent_to() and dependent_upon() methods:

Unable to get dependents to: 2f1071ac3228427289a6e03d2b625995 Unable to retrieve item dependents.

When I try

webmap_item.related_items('Map2FeatureCollection', 'forward')

It returns an empty array/list.

What are the limitations of these methods? Do they not work if any of the layers are hosted on a public ArcGIS Server? How about an ArcGIS Server that has security setup?

I tried dependent_to on several feature layers and also received the same error.

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CoffeeforClosers

I'm also running into this error message when attempting to map out relationship between portal items, in this case a web map and a layers in the map.

zoningItem<SPAN class="punctuation token">.</SPAN>related_items<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'Map2FeatureCollection'</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'forward'</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

returns an empty array

While running the dependent_upon or dependent_to methods returns:

Unable to get dependencies <SPAN class="keyword token">for</SPAN> item<SPAN class="punctuation token">:</SPAN> item<SPAN class="comment token">#</SPAN>
Unable to retrieve item dependencies<SPAN class="punctuation token">.</SPAN>
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RuntimeError&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Traceback <SPAN class="punctuation token">(</SPAN>most recent call last<SPAN class="punctuation token">)</SPAN>
<SPAN class="operator token"><</SPAN>ipython<SPAN class="operator token">-</SPAN>input<SPAN class="number token">-3</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">2b1d726173d1</SPAN><SPAN class="operator token">></SPAN> <SPAN class="keyword token">in</SPAN> <SPAN class="operator token"><</SPAN>module<SPAN class="operator token">></SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="operator token">-</SPAN><SPAN class="operator token">-</SPAN><SPAN class="operator token">-</SPAN><SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN> <SPAN class="number token">1</SPAN> zoningItem<SPAN class="punctuation token">.</SPAN>dependent_upon<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="operator token">/</SPAN>opt<SPAN class="operator token">/</SPAN>conda<SPAN class="operator token">/</SPAN>lib<SPAN class="operator token">/</SPAN>python3<SPAN class="number token">.5</SPAN><SPAN class="operator token">/</SPAN>site<SPAN class="operator token">-</SPAN>packages<SPAN class="operator token">/</SPAN>arcgis<SPAN class="operator token">/</SPAN>gis<SPAN class="punctuation token">.</SPAN>py <SPAN class="keyword token">in</SPAN> dependent_upon<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp; <SPAN class="number token">2993</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">dependent_upon</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp; <SPAN class="number token">2994</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="string token">""" Returns items and urls, etc that this items depends upon&nbsp; """</SPAN>
<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN> <SPAN class="number token">2995</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> self<SPAN class="punctuation token">.</SPAN>_portal<SPAN class="punctuation token">.</SPAN>get_item_dependencies<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">.</SPAN>itemid<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp; <SPAN class="number token">2996</SPAN> 
&nbsp;&nbsp; <SPAN class="number token">2997</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">dependent_to</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

<SPAN class="operator token">/</SPAN>opt<SPAN class="operator token">/</SPAN>conda<SPAN class="operator token">/</SPAN>lib<SPAN class="operator token">/</SPAN>python3<SPAN class="number token">.5</SPAN><SPAN class="operator token">/</SPAN>site<SPAN class="operator token">-</SPAN>packages<SPAN class="operator token">/</SPAN>arcgis<SPAN class="operator token">/</SPAN>_impl<SPAN class="operator token">/</SPAN>portalpy<SPAN class="punctuation token">.</SPAN>py <SPAN class="keyword token">in</SPAN> get_item_dependencies<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">,</SPAN> itemid<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp; <SPAN class="number token">1124</SPAN> 
&nbsp;&nbsp; <SPAN class="number token">1125</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">get_item_dependencies</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">,</SPAN> itemid<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
<SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN> <SPAN class="number token">1126</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> self<SPAN class="punctuation token">.</SPAN>con<SPAN class="punctuation token">.</SPAN>post<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'content/items/'</SPAN> <SPAN class="operator token">+</SPAN> itemid <SPAN class="operator token">+</SPAN> <SPAN class="string token">'/dependencies'</SPAN><SPAN class="punctuation token">,</SPAN> self<SPAN class="punctuation token">.</SPAN>_postdata<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp; <SPAN class="number token">1127</SPAN> 
&nbsp;&nbsp; <SPAN class="number token">1128</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">def</SPAN> <SPAN class="token function">get_item_dependents_to</SPAN><SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">,</SPAN> itemid<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

<SPAN class="operator token">/</SPAN>opt<SPAN class="operator token">/</SPAN>conda<SPAN class="operator token">/</SPAN>lib<SPAN class="operator token">/</SPAN>python3<SPAN class="number token">.5</SPAN><SPAN class="operator token">/</SPAN>site<SPAN class="operator token">-</SPAN>packages<SPAN class="operator token">/</SPAN>arcgis<SPAN class="operator token">/</SPAN>_impl<SPAN class="operator token">/</SPAN>connection<SPAN class="punctuation token">.</SPAN>py <SPAN class="keyword token">in</SPAN> post<SPAN class="punctuation token">(</SPAN>self<SPAN class="punctuation token">,</SPAN> path<SPAN class="punctuation token">,</SPAN> postdata<SPAN class="punctuation token">,</SPAN> files<SPAN class="punctuation token">,</SPAN> ssl<SPAN class="punctuation token">,</SPAN> compress<SPAN class="punctuation token">,</SPAN> is_retry<SPAN class="punctuation token">,</SPAN> use_ordered_dict<SPAN class="punctuation token">,</SPAN> add_token<SPAN class="punctuation token">,</SPAN> verify_cert<SPAN class="punctuation token">,</SPAN> token<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="number token">954</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">elif</SPAN> errorcode <SPAN class="operator token">==</SPAN> <SPAN class="number token">498</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="number token">955</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">raise</SPAN> RuntimeError<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'Invalid token'</SPAN><SPAN class="punctuation token">)</SPAN>
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&nbsp;&nbsp;&nbsp; <SPAN class="number token">957</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">return</SPAN> None
&nbsp;&nbsp;&nbsp; <SPAN class="number token">958</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">except</SPAN> AttributeError<SPAN class="punctuation token">:</SPAN>

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&nbsp;&nbsp;&nbsp; <SPAN class="number token">974</SPAN> 
&nbsp;&nbsp;&nbsp; <SPAN class="number token">975</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; errormessage <SPAN class="operator token">=</SPAN> errormessage <SPAN class="operator token">+</SPAN> <SPAN class="string token">"\n(Error Code: "</SPAN> <SPAN class="operator token">+</SPAN> str<SPAN class="punctuation token">(</SPAN>errorcode<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">+</SPAN><SPAN class="string token">")"</SPAN>
<SPAN class="operator token">-</SPAN><SPAN class="operator token">-</SPAN><SPAN class="operator token">></SPAN> <SPAN class="number token">976</SPAN>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">raise</SPAN> RuntimeError<SPAN class="punctuation token">(</SPAN>errormessage<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="number token">977</SPAN> 
&nbsp;&nbsp;&nbsp; <SPAN class="number token">978</SPAN> <SPAN class="keyword token">class</SPAN> <SPAN class="token class-name">_StrictURLopener</SPAN><SPAN class="punctuation token">(</SPAN>request<SPAN class="punctuation token">.</SPAN>FancyURLopener<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>

RuntimeError<SPAN class="punctuation token">:</SPAN> Unable to get dependencies <SPAN class="keyword token">for</SPAN> item<SPAN class="punctuation token">:</SPAN> item<SPAN class="comment token">#</SPAN>
Unable to retrieve item dependencies<SPAN class="punctuation token">.</SPAN>
<SPAN class="punctuation token">(</SPAN>Error Code<SPAN class="punctuation token">:</SPAN> <SPAN class="number token">500</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

CoffeeforClosers

Bumping this to see if anyone has developed a solution when facing this issue.

Anonymous User

Was this ever resolved?

CoffeeforClosers

I spoke with an ESRI staffer at the UC last summer and he clarified that item relationships must be declared for each item in the portal. I think that would explain the errors mentioned above. I thought that behind the scenes ESRI was graphing the item dependencies and exposing them via the relationship method but that appears to not be the case.

RobertWeber

They make very little mention of needing to establish these relationships. It is implied in the documentation that for Web Map Items in particular it is done in the background. I only get empty results on any of the three methods.

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