add multi column non unique columns

docs/models/index.md

@@ -357,11 +357,16 @@ You can overwrite this parameter by providing `Meta` class `tablename` argument.
 
 On a model level you can also set model-wise constraints on sql columns.
 
-Right now only `UniqueColumns` constraint is present. 
+Right now only `IndexColumns` and `UniqueColumns` constraints are supported. 
+
+!!!note
+        Note that both constraints should be used only if you want to set a name on constraint or want to set the index on multiple columns, otherwise `index` and `unique` properties on ormar fields are preferred.
 
 !!!tip
     To read more about columns constraints like `primary_key`, `unique`, `ForeignKey` etc. visit [fields][fields].
 
+#### UniqueColumns
+
 You can set this parameter by providing `Meta` class `constraints` argument.
 
 ```Python hl_lines="14-17"
@@ -373,6 +378,20 @@ You can set this parameter by providing `Meta` class `constraints` argument.
         To set one column as unique use [`unique`](../fields/common-parameters.md#unique) common parameter. 
         Of course you can set many columns as unique with this param but each of them will be checked separately.
 
+#### IndexColumns
+
+You can set this parameter by providing `Meta` class `constraints` argument.
+
+```Python hl_lines="14-17"
+--8<-- "../docs_src/models/docs017.py"
+```
+
+!!!note
+        Note that constraints are meant for combination of columns that should be in the index. 
+        To set one column index use [`unique`](../fields/common-parameters.md#index) common parameter. 
+        Of course, you can set many columns as indexes with this param but each of them will be a separate index.
+
+
 ### Pydantic configuration
 
 As each `ormar.Model` is also a `pydantic` model, you might want to tweak the settings of the pydantic configuration.

docs/releases.md

@@ -1,3 +1,9 @@
+# 0.10.19
+
+## ✨ Features
+
+* Add support for multi-column non-unique `IndexColumns` in `Meta.constraints` [#307](https://github.com/collerek/ormar/issues/307)
+
 # 0.10.18
 
 ## 🐛 Fixes