Application type

An application is an abstraction that a user can add to group. More information about this can be found in the introduction. This is a tutorial about how you can add your own application to Baserow via a plugin. We are going to create a text file application. In the end a user can use the “Create new” button to create a text file and add it to a group. We expect that you are using the plugin boilerplate.

Backend

We are going to start by creating a new application type instance for our text file and add it to the application type registry. By doing this the Baserow backend knows we have an additional application type names text_file. Creating the following python classes and modify the plugins config. Every time a user creates a new text file application a TextFile model instance is automatically created. It also possible to save unique attributes for each created text file by adding the properties to the model, but we do not need that in this case.

plugins/my_baserow_plugin/backend/src/my_baserow_plugin/models.py

from baserow.core.models import Application

class TextFile(Application):
    pass

plugins/my_baserow_plugin/backend/src/my_baserow_plugin/application_types.py

from baserow.core.registries import ApplicationType

from .models import TextFile


class TextFileApplicationType(ApplicationType):
    type = 'text_file'
    model_class = TextFile

plugins/my_baserow_plugin/backend/src/my_baserow_plugin/config.py

from django.apps import AppConfig

from baserow.core.registries import plugin_registry, application_type_registry


class PluginNameConfig(AppConfig):
    name = 'my_baserow_plugin'

    def ready(self):
        from .plugins import PluginNamePlugin
        from .application_types import TextFileApplicationType

        plugin_registry.register(PluginNamePlugin())
        application_type_registry.register(TextFileApplicationType())

Once these files have been created you first need to apply the schema changes because we need the table related to the TextFile model. Execute the following commands inside the backend container.

$ baserow makemigrations my_baserow_plugin
$ baserow migrate 

Lets try to create a new application with the text_file type by calling the create_application endpoint. More information on how to do this can be found in the api docs and in the create application api spec. If that succeeds you are ready to get to the next web-frontend part. You might want to inspect the backend/src/baserow/core/registries.py::ApplicationType class for all the options.

Web frontend

Because the backend and web-frontend are two separate applications that only communicate via a REST API with each other, the web-frontend does not yet know about the existence of the text_file application type. We can add this in a similar way. Add/modify the following files in the web-frontend part of the plugin.

plugins/my_baserow_plugin/web-frontend/applicationTypes.js

import { ApplicationType } from '@baserow/modules/core/applicationTypes'

export class TextFileApplicationType extends ApplicationType {
  static getType() {
    return 'text_file'
  }

  getIconClass() {
    return 'file-alt'
  }

  getName() {
    return 'Text file'
  }

  select(application) {
    console.log(`text file selected with id from dashboard ${application.id}`)
  }
}

plugins/my_baserow_plugin/web-frontend/plugin.js

import { PluginNamePlugin } from '@my-baserow-plugin/plugins'
import { TextFileApplicationType } from '@my-baserow-plugin/applicationTypes'

export default ({ store, app }) => {
  app.$registry.register('plugin', new PluginNamePlugin())
  app.$registry.register('application', new TextFileApplicationType())
}

Once you have added this code you should be able to use the “Create new” button in the sidebar of the web-frontend to create a new text file. Of course if you click on it in the state right now it does not do anything. There are several methods that can be overridden in the TextFileApplicationType class. You can for example create a new route and provide that route name in the getRouteName method if you want to navigate to that route when the user clicks on the text file in the sidebar. You might want to inspect the web-frontend/modules/core/applicationTypes.js file in the Baserow repository for all the options.