Model not updating upon program start

[vague2k]

Hey! I have 2 models, the first being an event list model (which uses a custom delegate), and the 2nd where the model shows more information/details on the currently focused "event" item from the event list.

When the list model is focused, every time the cursor moves it sends an update to the "details" model saying "Hey! we're hovering a new item, show more information for this item." The problem is on program start, it seems the "details" model doesn't get updated right away. Maybe I'm missing something but I'd sure appreciate some help.

Here's a small video showcasing the problem. Notice how when the first program starts, the view on the right (the details model's view) doesn't get updated immediately, even though (according to the code) the item at index 0 should be sent instantly as a msg.

2025-03-04.22-00-28.mp4

my parent/global model currently looks as follows

package main

import (
	"fmt"
	"math"

	"github.com/charmbracelet/bubbles/list"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

type focusedState uint // tracks which part of the view is focused
const (
	eventListView focusedState = iota
	eventListDetailsView
)

var (
	// -3 is an offset to account for borders + help line
	width  = int(math.Round(float64(TermWidth())/2) - 3)
	height = TermHeight() - 3
)

type GlobalModel struct {
	list    list.Model
	details tea.Model
	focused focusedState
	styles  GlobalStyles
	events  *[]Event
}

func NewGlobalModel(events *[]Event) GlobalModel {
	eventListModel := NewEventListModel(events)
	eventListDetailsModel := NewDetailsModel()
	styles := DefaultGlobalStyles()

	model := GlobalModel{
		list:    eventListModel,
		details: eventListDetailsModel,
		styles:  styles,
		focused: eventListView, // this view is focused by default when the TUI runs
	}

	return model
}

func (m GlobalModel) Init() tea.Cmd {
	return nil
}

func (m GlobalModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	var updateList, updateDetails tea.Cmd
	switch msg := msg.(type) {
	case tea.KeyMsg:
		switch msg.String() {
		case "ctrl+c", "q":
			return m, tea.Quit
		case "tab":
			if m.focused == eventListView {
				m.focused = eventListDetailsView
			} else {
				m.focused = eventListView
			}
		}

		switch m.focused {
		case eventListView:
			// at this point, the msg passed from the global model is
			// of type tea.KeyMsg
			m.list, updateList = m.list.Update(msg)

			// send a "msg" down to the details model of whatever item
			// is currently being hovered/focused
			item := m.list.Items()[m.list.Index()]
			m.details, updateDetails = m.details.Update(item)
		}
	}
	return m, tea.Batch(updateList, updateDetails)
}

func (m GlobalModel) View() string {
	var s string
	if m.focused == eventListView {
		s += lipgloss.
			JoinHorizontal(
				lipgloss.Top,
				m.styles.Focused.Render(fmt.Sprintf("%4s", m.list.View())),
				m.styles.Unfocused.Render(m.details.View()))
	} else {
		s += lipgloss.
			JoinHorizontal(lipgloss.Top,
				m.styles.Unfocused.Render(fmt.Sprintf("%4s", m.list.View())),
				m.styles.Focused.Render(m.details.View()))
	}
	s += m.styles.Help.Render("\ntab: focus next • q: exit")
	return s
}

// GlobalStyles contains style definitions for the global model. these
// values are generated by DefaultGlobalStyles.
type GlobalStyles struct {
	Focused,
	Unfocused,
	Help lipgloss.Style
}

func DefaultGlobalStyles() (s GlobalStyles) {
	s.Focused = lipgloss.NewStyle().
		Width(width).
		Height(height).
		BorderStyle(lipgloss.RoundedBorder()).
		BorderForeground(lipgloss.Color(termANSIBrightYellow.String()))

	s.Unfocused = lipgloss.NewStyle().
		Width(width).
		Height(height).
		BorderStyle(lipgloss.RoundedBorder()).
		BorderForeground(lipgloss.Color(termANSIBrightBlack.String()))

	s.Help = lipgloss.NewStyle().Foreground(lipgloss.Color(termANSIBrightBlack.String()))

	return s
}

Am I missing someting? is this a skill issue moment. Any help is appreciated

[vague2k]

This was absolutely a skill issue. m.details.Update(...) was only being called, when the cases for tea.KeyMsg and eventListView were true. Thus to update on start, I had to put m.details.Update(...) at the end of the global model's Update().