docs: Update ObjectBox docs

docs/modules/retrieval/vector_stores/integrations/objectbox.md

@@ -13,6 +13,7 @@ ObjectBox features:
 - Low memory footprint: ObjectBox itself just takes a few MB of memory. The entire binary is only about 3 MB (compressed around 1 MB)
 - Scales with hardware: efficient resource usage is also an advantage when running on more capable devices like the latest phones, desktops and servers
 
+Official ObjectBox resources:
 - [ObjectBox Vector Search docs](https://docs.objectbox.io/ann-vector-search)
 - [The first On-Device Vector Database: ObjectBox 4.0](https://objectbox.io/the-first-on-device-vector-database-objectbox-4-0)
 - [On-device Vector Database for Dart/Flutter](https://objectbox.io/on-device-vector-database-for-dart-flutter)
@@ -42,21 +43,21 @@ dependencies:
 ### 3. Instantiate the ObjectBox vector store
 
 ```dart
-final embeddings = OllamaEmbeddings(model: 'mxbai-embed-large:335m');
+final embeddings = OllamaEmbeddings(model: 'jina/jina-embeddings-v2-small-en');
 final vectorStore = ObjectBoxVectorStore(
   embeddings: embeddings,
-  dimensions: 1024,
+  dimensions: 512,
 );
 ```
 
-The dimensions parameter specifies the number of dimensions of the embeddings. It will depend on the embeddings model you are using. In this example, we are using the `mxbai-embed-large:335m` model, which has 1024 dimensions.
+The dimensions parameter specifies the number of dimensions of the embeddings. It will depend on the embeddings model you are using. In this example, we are using the [jina/jina-embeddings-v2-small-en](https://ollama.com/jina/jina-embeddings-v2-small-en) model, which has 512 dimensions.
 
 The `ObjectBoxVectorStore` constructor allows you to customize the ObjectBox store that is created under the hood. For example, you can change the directory where the database is stored:
 
 ```dart
 final vectorStore = ObjectBoxVectorStore(
   embeddings: embeddings,
-  dimensions: 1024,
+  dimensions: 512,
   directory: 'path/to/db',
 );
 ```
@@ -129,15 +130,15 @@ This example demonstrates how to build a fully local RAG (Retrieval-Augmented Ge
 Before running the example, make sure you have the following:
 
 - Ollama installed (see the [Ollama documentation](https://ollama.com/) for installation instructions).
-- [mxbai-embed-large:335m](https://ollama.com/library/mxbai-embed-large:335m) and [`llama3:8b`](https://ollama.com/library/llama3:8b) models downloaded.
+- [jina/jina-embeddings-v2-small-en](https://ollama.com/jina/jina-embeddings-v2-small-en) and [llama3:8b](https://ollama.com/library/llama3:8b) models downloaded.
 
 #### Steps
 
 **Step 1: Retrieving and Storing Documents**
 
 1. Retrieve several posts from the ObjectBox blog using a `WebBaseLoader` document loader.
 2. Split the retrieved posts into chunks using a `RecursiveCharacterTextSplitter`.
-3. Create embeddings from the document chunks using the `mxbai-embed-large:335m` embeddings model via `OllamaEmbeddings`.
+3. Create embeddings from the document chunks using the `jina/jina-embeddings-v2-small-en` embeddings model via `OllamaEmbeddings`.
 4. Add the document chunks and their corresponding embeddings to the `ObjectBoxVectorStore`.
 
 > Note: this step only needs to be executed once (unless the documents change). The stored documents can be used for multiple queries.
@@ -151,8 +152,8 @@ Before running the example, make sure you have the following:
 ```dart
 // 1. Instantiate vector store
 final vectorStore = ObjectBoxVectorStore(
-  embeddings: OllamaEmbeddings(model: 'mxbai-embed-large:335m'),
-  dimensions: 1024,
+  embeddings: OllamaEmbeddings(model: 'jina/jina-embeddings-v2-small-en'),
+  dimensions: 512,
 );
 
 // 2. Load documents
@@ -241,6 +242,10 @@ await stream.forEach(stdout.write);
 // [2] https://objectbox.io/on-device-vector-database-for-dart-flutter/
 ```
 
+## Example: Wikivoyage EU
+
+Check out the [Wikivoyage EU example](https://github.com/davidmigloz/langchain_dart/tree/main/examples/wikivoyage_eu), to see how to build a fully local chatbot that uses RAG to plan vacation plans in Europe.
+
 ## Advance
 
 ### BaseObjectBoxVectorStore

examples/docs_examples/bin/modules/retrieval/vector_stores/integrations/objectbox.dart

@@ -11,8 +11,8 @@ void main() async {
 Future<void> _rag() async {
   // 1. Instantiate vector store
   final vectorStore = ObjectBoxVectorStore(
-    embeddings: OllamaEmbeddings(model: 'mxbai-embed-large:335m'),
-    dimensions: 1024,
+    embeddings: OllamaEmbeddings(model: 'jina/jina-embeddings-v2-small-en'),
+    dimensions: 512,
     directory: 'bin/modules/retrieval/vector_stores/integrations',
   );
 

examples/wikivoyage_eu/README.md

@@ -70,7 +70,7 @@ Added 160 documents to the vector store.
 
 The chatbot script implements the RAG pipeline. It does the following:
 1. Takes a user query as input.
-2. Uses the `mxbai-embed-large:335m` model to create an embedding for the query.
+2. Uses the `jina/jina-embeddings-v2-small-en` model to create an embedding for the query.
 3. Retrieves the 5 most similar documents from the ObjectBox database.
 4. Builds a prompt using the retrieved documents and the query.
 5. Uses the `llama3:8b` model to generate a response to the prompt.