Ist es möglich, einen benutzerdefinierten Namen für eine Zuordnung festzulegen?Ecto Assoziation benutzerdefinierter Name
Zum Beispiel: Ich habe klassische "Benutzer -> Beiträge" -Situation:
create table(:users) do
add :first_name, :string
add :last_name, :string
timestamps()
end
create table(:posts) do
add :text, :string
add :user_id, references(:users, on_delete: :nothing)
timestamps()
end
und Schema:
schema "users" do
field :first_name, :string
field :last_name, :string
has_many :posts, MyProj.Post
timestamps()
end
schema "posts" do
field :text, :string
belongs_to :user, MyProj.User
timestamps()
end
I der Verein in posts
will nicht user
aber author
aufgerufen werden. Wenn ich mein Schema zu ändern:
schema "posts" do
field :text, :string
belongs_to :author, MyProj.User, [foreign_key: :user_id]
timestamps()
end
ich Fehler: field 'author' in 'select' does not exist in schema MyProj.Post
Edited:
ich die Fehler alle Beiträge zur Abfrage versuchen:
def all_posts _root, _args, _info do
posts_query = from p in Post,
preload: [:author],
select: %{
posted_by: p.author,
text: p.text
}
posts = Repo.all(posts_query)
{:ok, posts}
end
Stapel-Spur :
[info] Sent 500 in 30ms
[error] #PID<0.478.0> running MyProj.Endpoint terminated
Server: localhost:4000 (http)
Request: POST /graphiql
** (exit) an exception was raised:
** (Ecto.QueryError) lib/my-proj/resolvers/post_resolver.ex:7: field `author` in `select` does not exist in schema MyProj.Post in query:
from p in MyProj.Post,
select: %{posted_by: p.author, text: p.text},
preload: [:author]
(ecto) lib/ecto/repo/queryable.ex:124: Ecto.Repo.Queryable.execute/5
(ecto) lib/ecto/repo/queryable.ex:37: Ecto.Repo.Queryable.all/4
(my-proj) lib/my-proj/resolvers/post_resolver.ex:17: MyProj.PostResolver.all_posts/3
(absinthe) lib/absinthe/resolution.ex:147: Absinthe.Resolution.call/2
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:191: Absinthe.Phase.Document.Execution.Resolution.reduce_resolution/1
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:161: Absinthe.Phase.Document.Execution.Resolution.do_resolve_field/4
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:147: Absinthe.Phase.Document.Execution.Resolution.do_resolve_fields/6
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:87: Absinthe.Phase.Document.Execution.Resolution.walk_result/5
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:57: Absinthe.Phase.Document.Execution.Resolution.perform_resolution/3
(absinthe) lib/absinthe/phase/document/execution/resolution.ex:25: Absinthe.Phase.Document.Execution.Resolution.resolve_current/3
(absinthe) lib/absinthe/pipeline.ex:247: Absinthe.Pipeline.run_phase/3