Chore: Inbox Members API improvements (#3008)

- New Inbox Member APIs
- Return JSON errors for Platform APIs

app/controllers/concerns/request_exception_handler.rb

@@ -0,0 +1,47 @@
+module RequestExceptionHandler
+  extend ActiveSupport::Concern
+
+  included do
+    rescue_from ActiveRecord::RecordInvalid, with: :render_record_invalid
+  end
+
+  private
+
+  def handle_with_exception
+    yield
+  rescue ActiveRecord::RecordNotFound => e
+    Sentry.capture_exception(e)
+    render_not_found_error('Resource could not be found')
+  rescue Pundit::NotAuthorizedError
+    render_unauthorized('You are not authorized to do this action')
+  ensure
+    # to address the thread variable leak issues in Puma/Thin webserver
+    Current.reset
+  end
+
+  def render_unauthorized(message)
+    render json: { error: message }, status: :unauthorized
+  end
+
+  def render_not_found_error(message)
+    render json: { error: message }, status: :not_found
+  end
+
+  def render_could_not_create_error(message)
+    render json: { error: message }, status: :unprocessable_entity
+  end
+
+  def render_internal_server_error(message)
+    render json: { error: message }, status: :internal_server_error
+  end
+
+  def render_record_invalid(exception)
+    render json: {
+      message: exception.record.errors.full_messages.join(', ')
+    }, status: :unprocessable_entity
+  end
+
+  def render_error_response(exception)
+    render json: exception.to_hash, status: exception.http_status
+  end
+end