Class: DebugMcp::Tools::RailsModel

Inherits:
MCP::Tool
  • Object
show all
Defined in:
lib/debug_mcp/tools/rails_model.rb

Class Method Summary collapse

Class Method Details

.call(model_name: nil, session_id: nil, server_context:) ⇒ Object 



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# File 'lib/debug_mcp/tools/rails_model.rb', line 36

def call(model_name: nil, session_id: nil, server_context:)
  client = server_context[:session_manager].client(session_id)
  client.auto_repause!
  RailsHelper.require_rails!(client)

  # List models when model_name is omitted
  return list_models(client) unless model_name

  # Verify model exists and is an ActiveRecord model.
  # Uses a single rescue-wrapped expression to distinguish:
  #   "ar"        — confirmed ActiveRecord model
  #   "not_ar"    — constant exists but not AR
  #   "undefined" — constant not defined (autoloading may have failed)
  #   "err:Class" — evaluation raised (ThreadError in trap context, etc.)
  verify_result = verify_ar_model(client, model_name)
  return verify_result if verify_result.is_a?(MCP::Tool::Response)

  parts = []

  # Header with table name
  table_name = eval_expr(client, "#{model_name}.table_name")
  parts << "=== #{model_name} (table: #{table_name || "unknown"}) ==="

  # Columns
  parts << build_columns_section(client, model_name)

  # Associations
  section = build_associations_section(client, model_name)
  parts << section if section

  # Validations
  section = build_validations_section(client, model_name)
  parts << section if section

  # Enums
  section = build_enums_section(client, model_name)
  parts << section if section

  # Scopes
  section = build_scopes_section(client, model_name)
  parts << section if section

  # Callbacks
  section = build_callbacks_section(client, model_name)
  parts << section if section

  text = parts.compact.join("\n\n")

  # If columns section shows an error, it likely failed due to trap context
  if text.include?("unable to retrieve") || text.include?("Error:")
    text += "\n\n#{RailsHelper::TRAP_CONTEXT_HINT}" if RailsHelper.trap_context?(client)
  end

  MCP::Tool::Response.new([{ type: "text", text: text }])
rescue DebugMcp::Error => e
  text = "Error: #{e.message}"
  text += "\n\n#{RailsHelper::TRAP_CONTEXT_HINT}" if begin
    RailsHelper.trap_context?(client)
  rescue StandardError
    false
  end
  MCP::Tool::Response.new([{ type: "text", text: text }])
end