Weaviate Integration

The Apify Weaviate integration transfers selected data from Apify Actors to a Weaviate database. It processes the data, optionally splits it into chunks, computes embeddings, and saves them to Weaviate.

This integration supports incremental updates, updating only the data that has changed. This approach reduces unnecessary embedding computation and storage operations, making it suitable for search and retrieval augmented generation (RAG) use cases.

💡 Note: This Actor is meant to be used together with other Actors' integration sections. For instance, if you are using the Website Content Crawler, you can activate Weaviate integration to save web data as vectors to Weaviate.

What is Weaviate vector database?

Weaviate is an open-source vector database designed for storing and querying data objects and their vector embeddings. It is useful for similarity searches, making it useful for AI applications such as semantic search, question answering, and generative AI. Weaviate supports both raw vectors and structured data, allowing for the combination of vector search with traditional filtering methods. Clients are available for Python, Java, JavaScript/TypeScript, and Golang.

📋 How does the Apify-Weaviate integration work?

Apify Weaviate integration computes text embeddings and store them in Weaviate. It uses LangChain to compute embeddings and interact with Weaviate.

1. Retrieve a dataset as output from an Actor
2. [Optional] Split text data into chunks using langchain's RecursiveCharacterTextSplitter (enable/disable using performChunking and specify chunkSize, chunkOverlap)
3. [Optional] Update only changed data in Weaviate (enable/disable using enableDeltaUpdates)
4. Compute embeddings, e.g. using OpenAI or Cohere (specify embeddings and embeddingsConfig)
5. Save data into the database

✅ Before you start

To utilize this integration, ensure you have:

• Created or existing Weaviate database. You need to know weaviateUrl, weatiateApiKey, and weaviateCollectionName.
• An account to compute embeddings using one of the providers, e.g., OpenAI or Cohere.

You can run Weaviate using docker or you can try managed Weaviate.

👉 Examples

The configuration consists of three parts: Weaviate, embeddings provider, and data.

Ensure that the vector size of your embeddings aligns with the configuration of your Weaviate index. For instance, if you're using the text-embedding-3-small model from OpenAI, it generates vectors of size 1536. This means your Weaviate index should also be configured to accommodate vectors of the same size, 1536 in this case.

⚠️ Important: Currently, LangChain and Weaviate do not raise an error if there's a mismatch between these sizes. If the embedding model is not set up correctly, the only indication might be in the logs. Therefore, it's crucial to double-check your configuration to avoid any potential issues.

For detailed input information refer to the Input page.

Database: Weaviate

1{
2  "weaviateUrl": "YOUR-WEAVIATE-URL",
3  "weaviateApiKey": "YOUR-WEAVIATE-API-KEY",
4  "weaviateCollectionName": "YOUR-WEAVIATE-COLLECTION-NAME"
5}

Embeddings provider: OpenAI

1{
2  "embeddingsProvider": "OpenAIEmbeddings",
3  "embeddingsApiKey": "YOUR-OPENAI-API-KEY",
4  "embeddingsConfig": {"model":  "text-embedding-3-large"}
5}

Save data from Website Content Crawler to Weaviate

Data is transferred in the form of a dataset from Website Content Crawler, which provides a dataset with the following output fields (truncated for brevity):

1{
2  "url": "https://www.apify.com",
3  "text": "Apify is a platform that enables developers to build, run, and share automation tasks.",
4  "metadata": {"title": "Apify"}
5}

This dataset is then processed by the Weaviate integration. In the integration settings you need to specify which fields you want to save to Weaviate, e.g., ["text"] and which of them should be used as metadata, e.g., {"title": "metadata.title"}. Without any other configuration, the data is saved to Weaviate as is.

1{
2  "datasetFields": ["text"],
3  "metadataDatasetFields": {"title": "metadata.title"}
4}

Create chunks from Website Content Crawler data and save them to the database

Assume that the text data from the Website Content Crawler is too long to compute embeddings. Therefore, we need to divide the data into smaller pieces called chunks. We can leverage LangChain's RecursiveCharacterTextSplitter to split the text into chunks and save them into a database. The parameters chunkSize and chunkOverlap are important. The settings depend on your use case where a proper chunking helps optimize retrieval and ensures accurate responses.

1{
2  "datasetFields": ["text"],
3  "metadataDatasetFields": {"title": "metadata.title"},
4  "performChunking": true,
5  "chunkSize": 1000,
6  "chunkOverlap": 0
7}

Incrementally update database from the Website Content Crawler

To incrementally update data from the Website Content Crawler to Weaviate, configure the integration to update only the changed or new data. This is controlled by the enableDeltaUpdates setting. This way, the integration minimizes unnecessary updates and ensures that only new or modified data is processed.

A checksum is computed for each dataset item (together with all metadata) and stored in the database alongside the vectors. When the data is re-crawled, the checksum is recomputed and compared with the stored checksum. If the checksum is different, the old data (including vectors) is deleted and new data is saved. Otherwise, only the last_seen_at metadata field is updated to indicate when the data was last seen.

Provide unique identifier for each dataset item

To incrementally update the data, you need to be able to uniquely identify each dataset item. The variable deltaUpdatesPrimaryDatasetFields specifies which fields are used to uniquely identify each dataset item and helps track content changes across different crawls. For instance, when working with the Website Content Crawler, you can use the URL as a unique identifier.

1{
2  "enableDeltaUpdates": true,
3  "deltaUpdatesPrimaryDatasetFields": ["url"]
4}

Delete outdated (expired) data

The integration can delete data from the database that hasn't been crawled for a specified period, which is useful when data becomes outdated, such as when a page is removed from a website.

The deletion feature can be enabled or disabled using the deleteExpiredObjects setting.

For each crawl, the last_seen_at metadata field is created or updated. This field records the most recent time the data object was crawled. The expiredObjectDeletionPeriodDays setting is used to control number of days since the last crawl, after which the data object is considered expired. If a database object has not been seen for more than the expiredObjectDeletionPeriodDays, it will be deleted automatically.

The specific value of expiredObjectDeletionPeriodDays depends on your use case.

• If a website is crawled daily, expiredObjectDeletionPeriodDays can be set to 7.
• If you crawl weekly, it can be set to 30.

To disable this feature, set deleteExpiredObjects to false.

1{
2  "deleteExpiredObjects": true,
3  "expiredObjectDeletionPeriodDays": 30
4}

💡 If you are using multiple Actors to update the same database, ensure that all Actors crawl the data at the same frequency. Otherwise, data crawled by one Actor might expire due to inconsistent crawling schedules.

💾 Outputs

This integration will save the selected fields from your Actor to Weaviate.

🔢 Example configuration

Full Input Example for Website Content Crawler Actor with Weaviate integration

1{
2  "weaviateUrl": "https://apify-e2g4df23k.weaviate.network",
3  "weaviateApiKey": "YOUR-WEAVIATE-API-KEY",
4  "weaviateCollectionName": "YOUR-WEAVIATE-COLLECTION-NAME",
5  "embeddingsApiKey": "YOUR-OPENAI-API-KEY",
6  "embeddingsConfig": {
7    "model": "text-embedding-3-small"
8  },
9  "embeddingsProvider": "OpenAI",
10  "datasetFields": [
11    "text"
12  ],
13  "enableDeltaUpdates": true,
14  "deltaUpdatesPrimaryDatasetFields": ["url"],
15  "expiredObjectDeletionPeriodDays": 7,
16  "performChunking": true,
17  "chunkSize": 2000,
18  "chunkOverlap": 200
19}

Weaviate

1{
2  "weaviateUrl": "YOUR-WEAVIATE-URL",
3  "weaviateApiKey": "YOUR-WEAVIATE-API-KEY",
4  "weaviateCollectionName": "YOUR-WEAVIATE-COLLECTION-NAME"
5}

OpenAI embeddings

1{
2  "embeddingsApiKey": "YOUR-OPENAI-API-KEY",
3  "embeddings": "OpenAI",
4  "embeddingsConfig": {"model":  "text-embedding-3-large"}
5}

Cohere embeddings

1{
2  "embeddingsApiKey": "YOUR-COHERE-API-KEY",
3  "embeddings": "Cohere",
4  "embeddingsConfig": {"model":  "embed-multilingual-v3.0"}
5}