api: Remove TestCase.get_components() in favor of Component.filter()

internally it is used in only 1 place while Component.filter is much
more common and better covered with tests.

To filter components for a particular TC use:
JSON-RPC call -> ('Component.filter', [{'cases': TC.id}], callback);

tcms/rpc/api/testcase.py

@@ -21,7 +21,6 @@
     'remove_comment',
 
     'add_component',
-    'get_components',
     'remove_component',
 
     'add_notification_cc',
@@ -62,27 +61,6 @@ def add_component(case_id, component):
     return case.serialize()
 
 
-@permissions_required('testcases.view_testcase')
-@rpc_method(name='TestCase.get_components')
-def get_components(case_id):
-    """
-    .. function:: XML-RPC TestCase.get_components(case_id)
-
-        Get the list of components attached to this case.
-
-        :param case_id: PK if TestCase
-        :type case_id: int
-        :return: Serialized list of :class:`tcms.management.models.Component` objects
-        :rtype: list(dict)
-        :raises: TestCase.DoesNotExist if missing test case matching PK
-    """
-    test_case = TestCase.objects.get(pk=case_id)
-
-    component_ids = test_case.component.values_list('id', flat=True)
-    query = {'id__in': component_ids}
-    return Component.to_xmlrpc(query)
-
-
 @permissions_required('testcases.delete_testcasecomponent')
 @rpc_method(name='TestCase.remove_component')
 def remove_component(case_id, component_id):

tcms/testcases/static/testcases/js/get.js

@@ -100,7 +100,7 @@ $(document).ready(function() {
     // components table
     var components_table = $('#components').DataTable({
         ajax: function(data, callback, settings) {
-            dataTableJsonRPC('TestCase.get_components', [case_id], callback);
+            dataTableJsonRPC('Component.filter', [{'cases': case_id}], callback);
         },
         columns: [
             { data: "name" },