#291 - update important note and add query examples

README.md

@@ -3,12 +3,11 @@
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 # thehive4py
 
-> **IMPORTANT:** This library is currently in active development and is in the beta phase. Please use it with caution and be prepared for potential breaking changes until the first stable release!
+> **IMPORTANT:** thehive4py v1.x is not maintained anymore as TheHive v3 and v4 are end of life. thehive4py v2.x is a complete rewrite and is not compatible with thehive4py v1.x. The library is still in beta phase.
 
 **What's New:** This is a rebooted version of `thehive4py` designed specifically for TheHive 5. Stay tuned, as we have more exciting updates in store!
 
@@ -198,6 +197,54 @@ hive.alert.merge_into_case(alert_id=my_alert["_id"], case_id=my_case["_id"])
 
 By choosing the method that suits your workflow, you can efficiently manage cases and alerts within TheHive using `thehive4py`.
 
+## Query Case Observables
+
+To retrieve observables from a case, you can use the `case.find_observables` method provided by `thehive4py`. This method supports various filtering and querying options, allowing you to retrieve specific observables or all observables associated with a case.
+
+### Retrieve All Observables of a Case
+
+To retrieve all the observables of a case, use the following code:
+
+```python
+case_observables = hive.case.find_observables(case_id=my_case["_id"])
+```
+
+### Retrieve Specific Observables of a Case
+If you want to retrieve specific observables based on criteria, you can leverage TheHive's powerful query capabilities. You can refer to the official Query API documentation for more details.
+
+Here's an example of how to retrieve IP observables from a case:
+
+```python
+ip_observable = hive.case.find_observables(
+    case_id=my_case["_id"], filters=Eq("dataType", "ip") & Like("data", "93.184.216.34")
+)
+```
+
+
+In this example, we use the `Eq`, `Like` and the `&` operators filters to specify the criteria for the query. You can also achieve the same result using a dict-based approach for filtering:
+
+```python
+ip_observable = hive.case.find_observables(
+    case_id=my_case["_id"],
+    filters={
+        "_and": [
+            {"_field": "dataType", "_value": "ip"},
+            {"_like": {"_field": "data", "_value": "93.184.216.34"}},
+        ]
+    }
+)
+```
+
+The dict-based approach is possible, but we recommend using the built-in filter classes for building query expressions due to their ease of use.
+
+Currently, the filter classes support the following operators:
+
+- `&`: Used for the Query API's `_and` construct.
+- `|`: Used for the Query API's `_or` construct.
+- `~`: Used for the Query API's `_not` construct.
+
+These operators provide a convenient and intuitive way to construct complex queries.
+
 # Development
 
 ## Setting up a virtual environment (optional)