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March 24, 2018 19:13
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Ecto preloading within transaction
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| # create table(:invites) do | |
| # add :foo_id, references(:foo, on_delete: :delete_all), null: false | |
| # add :to_id, references(:users, on_delete: :delete_all), null: true | |
| # add :status, :string | |
| # end | |
| # create table(:holders) do | |
| # add :foo_id, references(:foo, on_delete: :delete_all), null: false | |
| # add :user_id, references(:users, on_delete: :delete_all), null: true | |
| # add :invite_id, referendes(:invites, on_delete: :delete_all) | |
| # end | |
| # defmodule Shared.Invite do | |
| # schema "invites" do | |
| # field :status, :string | |
| # belongs_to :foo, Shared.Foo | |
| # belongs_to :to, Shared.User | |
| # has_one :holder, Shared.Holder, foreign_key: :invite_id | |
| # end | |
| # end | |
| # defmodule Shared.Holder do | |
| # schema "holders" do | |
| # belongs_to :role, Shared.Foo | |
| # belongs_to :user, Shared.User | |
| # belongs_to :invite, Shared.Invite | |
| # end | |
| # end | |
| # Create some valid invite | |
| %Shared.Invite{...} = invite | |
| # Then check if preloading possible | |
| Shared.Repo.transaction(fn -> | |
| cs = Ecto.Changeset.change(invite, status: @accepted) | |
| case Shared.Repo.update(cs) do | |
| {:ok, invite} -> | |
| cs = Shared.ListingRoleHolder.changeset(%Shared.ListingRoleHolder{}, %{user_id: invite.to_id, role_id: invite.role_id, requester_id: invite.to_id, invite_id: invite.id}) | |
| case Shared.Repo.insert(cs) do | |
| {:ok, holder} -> | |
| invite = Shared.Repo.preload(invite, [:holder], force: true) | |
| assert(!invite.holder) | |
| _ -> Shared.Repo.rollback({:error, :could_not_insert_holder}) | |
| end | |
| _ -> Shared.Repo.rollback({:error, :could_not_update_invite}) | |
| end | |
| end) | |
| Shared.Repo.preload(invite, [:holder], force: true) | |
| assert(invite.holder) # Loaded fine |
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