Bot variables help you capture values that are commonly used by different tasks, nodes, and other bot elements. You can configure a bot variable as a key-value pair once in bot settings and substitute key with value at runtime during the conversation flow. By capturing frequently used values in a single place, bot variables provide the advantages of reusability and consistency.
For example, let’s say you are testing a flight booking bot using a staging endpoint. If you configure the endpoint as a variable, it helps you to call the API from several places quickly. When you want to change the staging endpoint to production while publishing the bot, it is easy.
Similarly, variables can be used to externalize content for messages and prompts from dialog flow definition.
Kore.ai platform allows bot developers to define the following two types of variables:
Global variables are a primary type of bot variables where you define a key-value pair and use the variable across the bot. As the variables are declared globally, they can be used at any point in the bot configuration.
Some of the typical use-cases where a developer can use global variables are:
- To manage the bot across environments having different endpoint URLs. The bot can be exported and imported based on the environment, and the infrastructure team will need to modify only the variable configuration file.
- To define and manage the bot response that is repeated within the bot configuration as variables.
- Authorization Token
- Channel-related tokens and URLs
Bot building essentially requires extensive content management efforts. When it comes to multi-language bots, it also involves tedious coordination efforts between the developers and globally-distributed content authors or copyright team. Content variables enable you to overcome that by abstracting bot flow development efforts from authoring or editing the content. Using Content Variables, programmers can avoid hard-coding the bot content, such as prompts, messages, or any data presented to the user, into bot components, and instead point to specific variables in centrally managed Content Variables files for each bot language. You can export the language-specific content variable files to content editors, without exposing any bot configurations. The writers can author the content in the exported file, which you can import back into the bot.
Defining Bot Variables within the Bot builder
Follow these steps to add or edit bot variables:
- Open the bot for which you want to add the variables, and go to Settings > Bot Variables.
- On the Bot Variables page, click Add Variable and enter the following details:
- Variable Name: Enter a name without any special characters, for example, Bots Environment.
- Type: Select Global or Language as the entity type.
- Value: Add a String expression. This string replaces the variable everywhere it is invoked.
Note: For content variables, you need to enter different values for each bot language. Refer to the next section to learn how.
- Enter developer notes in the Notes field. While this is an optional field, entering useful notes can help the developer working on the target bot to understand and provide relevant values.
- Click Save.
- Repeat steps 3-5 to add or edit more variables.
Entering Language-Specific Values for Content Variables
To add language-specific values for content variables, you first need to switch the bot language. You can switch the language by clicking the name of the currently-enabled language from the top-right corner of the bot’s page and then selecting another language as follows:
After switching the language, go to Settings > Bot Variables page and click the edit icon next to the relevant variable. Replace the text in the Value field in the enabled language.
Using Global Variables in Bots
You can invoke a global variable in plain text mode (Standard editor) using the following syntax:
Here’s an example from a bot that uses two global variables called botType and parameters to determine different bot environments such as development, testing, and production. The following script node in one of the bot’s tasks captures the base URL of the bot, depending on the current bot environment.
The URL in the following service node changes based on the captured URL
Using Content Variables in Bots
You can invoke a content variable in plain text mode (Standard editor) using the following syntax.
Here’s an entity node of a multi-language flight booking bot that captures the source airport of the users. It uses a content variable instead of hard-coded user prompt.
When the bot reaches this node as a part of the user interaction, the user prompt changes depending on the language of the interaction (provided you entered the respective variable values for all the enabled languages).
Importing and Exporting Bot Variables
You can import and export bot variables between bots. On the Bot Variables page (Settings > Bot Variables), click the next to Add Variables and select a choice. Bot variables are exported in the form of a JSON, CSV file.