Class: ChatController

Inherits:
ApplicationController
  • Object
show all
Includes:
LangsmithrbRails::TracedController
Defined in:
lib/generators/langsmithrb_rails/demo/templates/chat_controller.rb

Overview

Controller for the chat demo

Instance Method Summary collapse

Instance Method Details

#create ⇒ Object

POST /chat



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# File 'lib/generators/langsmithrb_rails/demo/templates/chat_controller.rb', line 14

def create
  # Create trace for the entire request
  langsmith_trace("chat_request", run_type: "chain") do |run|
    @message = ChatMessage.new(message_params)
    @message.is_user = true
    
    if @message.save
      # Record the user message in the trace
      run.inputs = { user_message: @message.content }
      
      # Generate a response
      llm_service = LlmService.new
      context = ChatMessage.order(created_at: :asc).last(5).map do |msg|
        { is_user: msg.is_user, content: msg.content }
      end
      
      response = llm_service.generate(@message.content, context)
      
      # Create the assistant message
      @assistant_message = ChatMessage.create!(
        content: response,
        is_user: false
      )
      
      # Record the assistant response in the trace
      run.outputs = { assistant_message: @assistant_message.content }
      
      # Respond with both messages for AJAX updates
      render json: {
        user_message: render_to_string(partial: "message", locals: { message: @message }),
        assistant_message: render_to_string(partial: "message", locals: { message: @assistant_message })
      }
    else
      render json: { error: @message.errors.full_messages.join(", ") }, status: :unprocessable_entity
    end
  end
end

#index ⇒ Object

GET /chat



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# File 'lib/generators/langsmithrb_rails/demo/templates/chat_controller.rb', line 8

def index
  @messages = ChatMessage.order(created_at: :asc).last(10)
  @message = ChatMessage.new
end