I’m working on an Om application that includes a music browser and player with
a simple artist -> albums -> songs hierarchy. When a user is viewing an artist
section I layout all the artist’s albums and songs hierarchically and this
works great since there is basically a 1-to-1 correspondence between the
component hierarchy and the data hierarchy.
Here’s a basic example of what a piece of the application state might look like
under some sort of :current-artist key:
{:name “The Beatles”
:albums [{:name “Abbey Road”,
:songs [{:name “Come Together”}
{:name “Something”}]}
{:name "Rubber Soul",
:songs [{:name "Drive My Car"}
{:name "Norwegian Wood"}]}]}
When a user plays one of these songs I build an ordered playlist of all the
artist’s songs. There is a player component that plays the playlist (even if
the user navigates away from the current artist section) and displays the
currently playing artist, album and song name. To achieve this I ended up
duplicating a bunch of artist/album/song data elsewhere in the application
state.
Here’s what the :playlist path of the application state might look like after a
user clicked the play button next to “Drive My Car”:
{:play-index 2
:songs [{:name “Come Together”
:album {:name “Abbey Road”
:artist {:name "The Beatles"}}}
{:name “Something”
:album {:name “Abbey Road”
:artist {:name "The Beatles"}}}
{:name “Drive My Car”
:album {:name “Rubber Soul”
:artist {:name "The Beatles"}}}
{:name “Norwegian Wood”
:album {:name "Rubber Soul"
:artist {:name "The Beatles"}}}]}
I think this sort of denormalization works fine in my case since the
artist/album/song data is not changing but I'm wondering if there is a better
way to accomplish this. If the data were changing then I would imagine it
could become a challenge to keep the playlist data in sync.
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