![]() ![]() The first association, has_many: book_authors, enables us to save and query the relationship between books and authors using the AuthorBook schema. We have also defined two associations that work neatly together. The books schema consists of three fields: title, price, and publication_date. AuthorBook schema "books" do field :price, :decimal field :publication_date, :utc_datetime field :title, :string has_many :book_authors, AuthorBook, preload_order:, on_replace: :delete has_many :authors, through: timestamps () end end To represent this, we’ll define three schemas: books, authors, and author_books.įirst, we define the author_books schema, which serves as the intermediate table in our many-to-many relationship:ĭefmodule ComponentsExamples. We’ll take inspiration from a bookstore scenario, where a book can have one or many authors, and an author can write one or many books. Incorporate the magic of checkboxes into our form to sort and delete elements.īy the end, we will have achieved something like this: Defining the Ecto Schemas.Set up a form with the required inputs to populate a many-to-many association.Define the changesets that enable us to use the :sort_param and :drop_param options.In this post, we will leverage the power of LiveView and Ecto to sort and delete elements in a many-to-many relationship. ![]() These options enable us to save associations in a specific order or delete associations based on their position.īut wait, there’s more! Passing these new parameters from LiveView is incredibly straightforward. Thankfully, Ecto has two new options to make that easier! When dealing with associations or embeds using cast_assoc/3 and cast_embed/3, respectively, we can use the :sort_param and :drop_param options. However, what if we want to sort the elements in a specific order? How can we remove specific records from an association? In a many-to-many relationship, we can easily insert, modify, or delete elements. Fly.io is a great place to run your Phoenix LiveView applications! Check out how to get started!Įcto enables us to effortlessly work with different types of associations. ![]() In this post, we’ll use Ecto’s :sort_param and :delete_param options, along with LiveView, to sort and delete elements within a many-to-many association. ![]()
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