Add support for dynamic setting of attributes from context based on #151

README.rst

@@ -103,6 +103,42 @@ You can be creative with these variables: e.g. a context processor could
 set a default CSS error class on all fields rendered by
 ``{% render_field %}``.
 
+In addition, it is possible to dynamically set attributes using a variable of type dict from context 
+and setting it equal to ``attr_dict``. The content of ``attr_dict`` its order around explicitly named 
+attributes matters; it is possible to set a default attribute that will be overwritten by ``attr_dict`` 
+by positioning it to the left, or conversely to have an attribute always overwrite one in ``attr_dict`` 
+by positioning it to the right.
+
+Examples:
+
+Let context_dict_var be:
+
+.. code-block:: html+django
+
+    context_dict_var = {"type":"text", id="my_username_id", placeholder="Login"}
+
+The following line:
+.. code-block:: html+django
+
+    {% render_field form.field attr_dict=context_dict %}
+
+returns:
+
+.. code-block:: html+django
+
+    <input type="text" id="my_field_id" placeholder="Input here" />
+
+The following line:
+.. code-block:: html+django
+
+    {% render_field form.field id="default_id" label="default_label" attr_dict=context_dict placeholder="Overwrite" %}
+
+returns:
+
+.. code-block:: html+django
+
+    <input type="text" id="default_id" label="default_label" placeholder="Overwrite" />
+
 attr
 ----
 Adds or replaces any single html attribute for the form field.

widget_tweaks/templatetags/widget_tweaks.py

@@ -215,11 +215,25 @@ def render(self, context):
             bounded_field = append_attr(
                 bounded_field, f"class:{context['WIDGET_REQUIRED_CLASS']}"
             )
+        attr_dict = {}
         for k, v in self.set_attrs:
-            if k == "type":
-                bounded_field.field.widget.input_type = v.resolve(context)
+            if k == "attr_dict":
+                resolved_dict = v.resolve(context)
+                if not isinstance(resolved_dict, dict):
+                    raise ValueError(f"{k} must be of type dict.")
+                attr_dict.update(resolved_dict)
             else:
-                bounded_field = set_attr(bounded_field, f"{k}:{v.resolve(context)}")
+                attr_dict[k] = v.resolve(context)
+        for k, v in attr_dict.items():
+            if v:
+                if isinstance(v, bool):
+                    bounded_field = set_attr(bounded_field, f"{k}")
+                if k == "type":
+                    bounded_field.field.widget.input_type = v
+                else:
+                    bounded_field = set_attr(bounded_field, f"{k}:{v}")
+            else:
+                bounded_field = remove_attr(bounded_field, k)
         for k, v in self.append_attrs:
             bounded_field = append_attr(bounded_field, f"{k}:{v.resolve(context)}")
         return str(bounded_field)