test for item prev and next links on item queries (#752) (#757)

pygeoapi/api.py

@@ -1832,16 +1832,24 @@ class API:
                                     request.locale),
             'href': '{}/collections/{}'.format(
                 self.config['server']['url'], dataset)
-        }, {
-            'rel': 'prev',
-            'type': 'application/geo+json',
-            'href': uri
-            }, {
-            'rel': 'next',
-            'type': 'application/geo+json',
-            'href': uri
-            }
-        ]
+        }]
+
+        if 'prev' in content:
+            content['links'].append({
+                'rel': 'prev',
+                'type': FORMAT_TYPES[request.format],
+                'href': '{}/collections/{}/items/{}?f={}'.format(
+                    self.config['server']['url'], dataset,
+                    content['prev'], request.format)
+            })
+        if 'next' in content:
+            content['links'].append({
+                'rel': 'next',
+                'type': FORMAT_TYPES[request.format],
+                'href': '{}/collections/{}/items/{}?f={}'.format(
+                    self.config['server']['url'], dataset,
+                    content['next'], request.format)
+            })
 
         # Set response language to requested provider locale
         # (if it supports language) and/or otherwise the requested pygeoapi

tests/test_api.py

@@ -724,6 +724,8 @@ def test_get_collection_item(config, api_):
     feature = json.loads(response)
 
     assert feature['properties']['stn_id'] == '35'
+    assert 'prev' not in feature['links']
+    assert 'next' not in feature['links']
 
 
 def test_get_collection_item_json_ld(config, api_):