The little thing I wrote about old command-line utilities.Īlso, Karen left a barbell by my door in Animal Crossing and I nearly cried. This article called "small, sharp tools can cut you, is a good complement to Synth, by Kazumi Totaka for Animal Crossing.
ECTO CHANGESET PRELOAD FREE
Happy to elaborate, feel free to reach out to me! 😄
Hey! Thanks for reading! Just a reminder that I wrote this some years ago, and may have much more complicated feelings about this topic than I did when I wrote it. |> Multi.Friday, :: Tagged under: engineering blurb. |> Multi.insert(insert_like_changeset(params)) Similarly, with a DiscussionItemLikes join schema, you can set the like_id and discussion_item_id.Įcto.Multi Might be a clean way to create a %Like in a single transaction. You can construct the Like changeset with the user_id field populated in the params. The alternative is to use a Join Schema, allowing you to explicitly insert/update the relationship independently of the entity either side.ĭo I need to load User and Dicussion_item to add a like here?
ECTO CHANGESET PRELOAD UPDATE
If you want to avoid the preload, then a Join Schema looks like the best option.ĭo I really need to preload the likes just to insert an item? Even on update I don't want to load the whole collection of associations to change one.įor the convenience of using put_assoc you'll need to preload. Put_assoc is OK here only if you don't mind preloading all the existing likes. I don't want to update the likes association - I want to add one. |> Repo.preload(:tags) # Load existing data The example given in the docs: # We can associate at any time post and tags together using changesets Missing data will invoke the :on_replace behaviour defined on the association. This function requires the association to have been preloaded in the changeset struct. This seems nuts, so I'm guessing I'm reading this wrong. This error message seems to suggest that in order to update one associated item, I need to provide a change set with ALL items including the one that changed. Do I need to load User and Dicussion_item to add a like here?.Do I really need to preload the likes just to insert an item? Even on update I don't want to load the whole collection of associations to change one.I don't want to update the likes association - I want to add one.This error message seems to suggest that in order to update one associated item, I need to provide a change set with ALL items including the one that changed.So here's the things that confuse me (there are a few): Orphan embed nor associated records, attempting to do so results in If you have a relationship with many children, at least the same NĬhildren must be given on update. You include the entry primary key (ID) alongside the data. If you are attempting to update an existing entry, please make sure You are attempting to change relation :likes of XXX.DiscussionItem, What I am finding is that this will create the Like and the association correctly the first time but then complain afterwards that I need additional information in the form of some id: Now lets say I have an existing DiscussionItem and I want to add a like association to this, here's what Im trying (simplified): user = Repo.one(User)ĭiscussion_item = Repo.one(from d in DiscussionItem, preload )Ĭhangeset = (discussion_item) Many_to_many :likes, XXX.Tag, join_through: "discussion_items_likes" Let's say I have some discussion board where users can like a post, and I have the following models: schema "discussion_items" do I'm getting rather confused about Ecto when it comes to adding a new association to an existing model.
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