Fix railtie not being loaded (#360)

* Fix railtie not being loaded

* Get rid of Forwardable

* Format code comments

* fix linter

lib/langchain.rb

@@ -89,3 +89,5 @@ module Errors
     class BaseError < StandardError; end
   end
 end
+
+require "langchain/railtie" if defined?(Rails)

lib/langchain/vectorsearch/base.rb

@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "forwardable"
-
 module Langchain::Vectorsearch
   # = Vector Databases
   # A vector database a type of database that stores data as high-dimensional vectors, which are mathematical representations of features or attributes. Each vector has a certain number of dimensions, which can range from tens to thousands, depending on the complexity and granularity of the data.

lib/langchain/vectorsearch/chroma.rb

@@ -5,7 +5,8 @@ class Chroma < Base
     #
     # Wrapper around Chroma DB
     #
-    # Gem requirements: gem "chroma-db", "~> 0.6.0"
+    # Gem requirements:
+    #     gem "chroma-db", "~> 0.6.0"
     #
     # Usage:
     # chroma = Langchain::Vectorsearch::Chroma.new(url:, index_name:, llm:, llm_api_key:, api_key: nil)

lib/langchain/vectorsearch/milvus.rb

@@ -5,7 +5,8 @@ class Milvus < Base
     #
     # Wrapper around Milvus REST APIs.
     #
-    # Gem requirements: gem "milvus", "~> 0.9.2"
+    # Gem requirements:
+    #     gem "milvus", "~> 0.9.2"
     #
     # Usage:
     # milvus = Langchain::Vectorsearch::Milvus.new(url:, index_name:, llm:, api_key:)

lib/langchain/vectorsearch/pgvector.rb

@@ -5,10 +5,12 @@ class Pgvector < Base
     #
     # The PostgreSQL vector search adapter
     #
-    # Gem requirements: gem "pgvector", "~> 0.2"
+    # Gem requirements:
+    #     gem "sequel", "~> 5.68.0"
+    #     gem "pgvector", "~> 0.2"
     #
     # Usage:
-    # pgvector = Langchain::Vectorsearch::Pgvector.new(url:, index_name:, llm:, namespace: nil)
+    #     pgvector = Langchain::Vectorsearch::Pgvector.new(url:, index_name:, llm:, namespace: nil)
     #
 
     # The operators supported by the PostgreSQL vector search adapter
@@ -150,3 +152,7 @@ def ask(question:, k: 4, &block)
     end
   end
 end
+
+# Rails connection when configuring vectorsearch
+# Update READMEs
+# Rails migration to create a migration

lib/langchain/vectorsearch/pinecone.rb

@@ -5,10 +5,11 @@ class Pinecone < Base
     #
     # Wrapper around Pinecone API.
     #
-    # Gem requirements: gem "pinecone", "~> 0.1.6"
+    # Gem requirements:
+    #     gem "pinecone", "~> 0.1.6"
     #
     # Usage:
-    # pinecone = Langchain::Vectorsearch::Pinecone.new(environment:, api_key:, index_name:, llm:, llm_api_key:)
+    #     pinecone = Langchain::Vectorsearch::Pinecone.new(environment:, api_key:, index_name:, llm:, llm_api_key:)
     #
 
     # Initialize the Pinecone client

lib/langchain/vectorsearch/qdrant.rb

@@ -5,10 +5,11 @@ class Qdrant < Base
     #
     # Wrapper around Qdrant
     #
-    # Gem requirements: gem "qdrant-ruby", "~> 0.9.3"
+    # Gem requirements:
+    #     gem "qdrant-ruby", "~> 0.9.3"
     #
     # Usage:
-    # qdrant = Langchain::Vectorsearch::Qdrant.new(url:, api_key:, index_name:, llm:, llm_api_key:)
+    #     qdrant = Langchain::Vectorsearch::Qdrant.new(url:, api_key:, index_name:, llm:, llm_api_key:)
     #
 
     # Initialize the Qdrant client

lib/langchain/vectorsearch/weaviate.rb

@@ -5,10 +5,11 @@ class Weaviate < Base
     #
     # Wrapper around Weaviate
     #
-    # Gem requirements: gem "weaviate-ruby", "~> 0.8.3"
+    # Gem requirements:
+    #     gem "weaviate-ruby", "~> 0.8.3"
     #
     # Usage:
-    # weaviate = Langchain::Vectorsearch::Weaviate.new(url:, api_key:, index_name:, llm:, llm_api_key:)
+    #     weaviate = Langchain::Vectorsearch::Weaviate.new(url:, api_key:, index_name:, llm:, llm_api_key:)
     #
 
     # Initialize the Weaviate adapter