# MatchTagMetas
## Introduction
**`MatchTagMetas`** widget in Supervisely is used to compare tag metas between two different projects. It displays a table with the tag name, type, and possible differences between the tag metas of the two datasets. This widget allows users to identify differences in the tag structure between projects and easily reconcile them. Additionally, it provides the comparison result in the form of a dictionary grouped in "match", `only_right`, `only_left`, `different_value_type`, `different_one_of_options`, `match_suffix`, `different_value_type_suffix`, and `different_one_of_options_suffix` categories.
## Function signature
```python
MatchTagMetas(
left_collection=None,
right_collection=None,
left_name=None,
right_name=None,
selectable=False,
suffix=None,
widget_id=None,
)
```
## Parameters
| Parameters | Type | Description |
| :----------------: | :---------------------------------------------: | :-------------------------------------------------------------------------------: |
| `left_collection` | `Union[TagMetaCollection, List[TagMeta], None]` | List of `TagMeta` or `TagMetaCollection`, containing information about left tags |
| `right_collection` | `Union[TagMetaCollection, List[TagMeta], None]` | List of `TagMeta` or `TagMetaCollection`, containing information about right tags |
| `left_name` | `str` | Left part column name |
| `right_name` | `str` | Right part column name |
| `selectable` | `bool` | Whether the component is selectable |
| `suffix` | `str` | Suffix to match tag names |
| `widget_id` | `str` | ID of the widget |
### left\_collection
Determine information about left tags.
**type:** `Union[TagMetaCollection, List[TagMeta], None]`
**default value:** `None`
### right\_collection
Determine information about right tags.
**type:** `Union[TagMetaCollection, List[TagMeta], None]`
**default value:** `None`
```python
match = MatchTagMetas(
left_collection=tag_metas_left,
right_collection=tag_metas_right,
)
```
### left\_name
Determine left part tags name.
**type:** `Union[str, None]`
**default value:** `None`
### right\_name
Determine right part tags name.
**type:** `Union[str, None]`
**default value:** `None`
```python
match = MatchTagMetas(
left_collection=tag_metas_left,
right_collection=tag_metas_right,
left_name="left tags",
right_name="right tags",
)
```
### selectable
Whether the components are selectable.
**type:** `bool`
**default value:** `False`
```python
match = MatchTagMetas(
left_collection=tag_metas_left,
right_collection=tag_metas_right,
selectable=True,
)
```
### suffix
Use to match tag names.
**type:** `Union[str, None]`
**default value:** `None`
### widget\_id
ID of the widget.
**type:** `str`
**default value:** `None`
## Methods and attributes
| Attributes and Methods | Description |
| :----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: | ------------------------------------------------ |
| `set(left_collection: Union[TagMetaCollection, List[TagMeta], None] = None, right_collection: Union[TagMetaCollection, List[TagMeta], None] = None, left_name=Union[str, None] = None, right_name=Union[str, None] = None, suffix: Union[str, None] = None)` | Set input data in left and right part of widget. |
| `get_stat()` | Return tags match statistics. |
| `get_selected()` | Return list of selected TagMeta names. |
### Mini App Example
You can find this example in our Github repository:
[ui-widgets-demos/compare data/002\_match\_tags/src/main.py](https://github.com/supervisely-ecosystem/ui-widgets-demos/blob/master/compare%20data/002_match_tags/src/main.py)
### Import libraries
```python
import os
import supervisely as sly
from supervisely.app.widgets import Card, Container, MatchTagMetas
from dotenv import load_dotenv
```
### Init API client
First, we load environment variables with credentials and init API for communicating with Supervisely Instance:
```python
load_dotenv("local.env")
load_dotenv(os.path.expanduser("~/supervisely.env"))
api = sly.Api()
```
### Prepare `TagMeta` we will matched
```python
project_id_left = 17208
meta_json_left = api.project.get_meta(project_id_left)
project_meta_left = sly.ProjectMeta.from_json(meta_json_left)
tag_metas_left = project_meta_left.tag_metas
project_id_right = 17752
meta_json_right = api.project.get_meta(project_id_right)
project_meta_right = sly.ProjectMeta.from_json(meta_json_right)
tag_metas_right = project_meta_right.tag_metas
```
### Initialize `MatchTagMetas` widget
```python
match = MatchTagMetas(
left_collection=tag_metas_left,
right_collection=tag_metas_right,
left_name="left tags",
right_name="right tags",
)
```
### Create app layout
Prepare a layout for app using `Card` widget with the `content` parameter and place widget that we've just created in the `Container` widget.
```python
card = Card(
title="Match Tags",
content=match,
)
layout = Container(widgets=[card])
```
### Create app using layout
Create an app object with layout parameter.
```python
app = sly.Application(layout=layout)
```
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