> For the complete documentation index, see [llms.txt](https://docs.kogno.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kogno.io/models.md).

# Models

As in Rails, Kogno uses the [`ActiveRecord`](https://www.rubydoc.info/gems/activerecord) library for this purpose, so the implementation and operation is the same.  So you can check out the official [Rails documentation](https://guides.rubyonrails.org/active_record_basics.html) if you want to read more about Models.

## Creating a new Model

Model classes should be created in `bot/models/` directory, where, in most cases, each one should have a corresponding database table. Which was [previously configured](/getting-started.md#configure-the-database).

In the example below, we will create  <mark style="color:orange;">`Product`</mark> model in `bot/models/product.rb` file.

For this to work, there must be a table in the database called `products`.

```ruby
class Product < ActiveRecord::Base
end
```

{% hint style="success" %}

### Associations

All the models that are needed can be created (with exception of the predefined by Kogno), defining associations between them.&#x20;

To lear more about associations you can read: [A Guide to Active Record Associations](https://guides.rubyonrails.org/v3.2/association_basics.html)`.`
{% endhint %}

## Predefined models

In a new project, by default the following models and their corresponding tables are created:

<table data-header-hidden><thead><tr><th width="380.3614774524641">Model</th><th width="229.311377245509">Table</th><th>Description</th></tr></thead><tbody><tr><td><mark style="color:orange;"><code>User</code></mark></td><td><code>users</code></td><td>Corresponds to users who are having or have had a conversation with the app.</td></tr><tr><td><mark style="color:orange;"><code>Sequence</code></mark></td><td><code>kogno_sequences</code></td><td>Message queue of the <a href="/pages/EO0XvZsERaHFF8IvI7SU">Sequences</a>.</td></tr><tr><td><mark style="color:orange;"><code>ChatLog</code></mark></td><td><code>kogno_chat_logs</code></td><td>Stores log of incoming messages/events and replies, if enabled the <a href="/pages/-M1V7gvjf1yBDZ6db3GB">project's configuration</a>.</td></tr><tr><td><mark style="color:orange;"><code>ScheduledMessage</code></mark></td><td><code>kogno_scheduled_messages</code></td><td><a href="/pages/k9YNvkUnFbk3RhVFGBGP">Scheduled Messages </a>queue.</td></tr><tr><td><mark style="color:orange;"><code>LongPayload</code></mark></td><td><code>kogno_long_payloads</code></td><td>It allows the <a href="/pages/sK4FLcPtE5qFJRVSob6k#set_payload-payload-string-params-hash">creation of payloads</a> with a number of characters greater than those delimited on each platform.</td></tr><tr><td><mark style="color:orange;"><code>MatchedMessage</code></mark></td><td><code>kogno_matched_messages</code></td><td>Used for <a href="https://core.telegram.org/bots/api#updating-messages">updating messages</a> feature from Telegram.</td></tr><tr><td><mark style="color:orange;"><code>MessengerRecurringNotification</code></mark></td><td><code>kogno_messenger_recurring_notifications</code></td><td>Stores the user's subscription current status from <a href="/pages/dGQhmqxqmGo4fCT4H4dj">Messenger Recurring Notifications</a>.</td></tr><tr><td><mark style="color:orange;">TelegramChatGroup</mark></td><td><code>kogno_telegram_chat_group</code></td><td>Store the Telegram groups or channels where <a href="/pages/-M1XnHZ_rHA9okouJMhr">the bot has been included</a>.</td></tr></tbody></table>