lemmy/crates/db_schema/src/aggregates/post_aggregates.rs

use crate::{aggregates::structs::PostAggregates, newtypes::PostId, schema::post_aggregates};
use diesel::{result::Error, *};

impl PostAggregates {
  pub fn read(conn: &mut PgConnection, post_id: PostId) -> Result<Self, Error> {
    post_aggregates::table
      .filter(post_aggregates::post_id.eq(post_id))
      .first::<Self>(conn)
  }
}

#[cfg(test)]
mod tests {
  use crate::{
    aggregates::post_aggregates::PostAggregates,
    source::{
      comment::{Comment, CommentInsertForm},
      community::{Community, CommunityInsertForm},
      instance::Instance,
      person::{Person, PersonInsertForm},
      post::{Post, PostInsertForm, PostLike, PostLikeForm},
    },
    traits::{Crud, Likeable},
    utils::establish_unpooled_connection,
  };
  use serial_test::serial;

  #[test]
  #[serial]
  fn test_crud() {
    let conn = &mut establish_unpooled_connection();

    let inserted_instance = Instance::create(conn, "my_domain.tld").unwrap();

    let new_person = PersonInsertForm::builder()
      .name("thommy_community_agg".into())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();

    let inserted_person = Person::create(conn, &new_person).unwrap();

    let another_person = PersonInsertForm::builder()
      .name("jerry_community_agg".into())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();

    let another_inserted_person = Person::create(conn, &another_person).unwrap();

    let new_community = CommunityInsertForm::builder()
      .name("TIL_community_agg".into())
      .title("nada".to_owned())
      .public_key("pubkey".to_string())
      .instance_id(inserted_instance.id)
      .build();

    let inserted_community = Community::create(conn, &new_community).unwrap();

    let new_post = PostInsertForm::builder()
      .name("A test post".into())
      .creator_id(inserted_person.id)
      .community_id(inserted_community.id)
      .build();

    let inserted_post = Post::create(conn, &new_post).unwrap();

    let comment_form = CommentInsertForm::builder()
      .content("A test comment".into())
      .creator_id(inserted_person.id)
      .post_id(inserted_post.id)
      .build();

    let inserted_comment = Comment::create(conn, &comment_form, None).unwrap();

    let child_comment_form = CommentInsertForm::builder()
      .content("A test comment".into())
      .creator_id(inserted_person.id)
      .post_id(inserted_post.id)
      .build();

    let inserted_child_comment =
      Comment::create(conn, &child_comment_form, Some(&inserted_comment.path)).unwrap();

    let post_like = PostLikeForm {
      post_id: inserted_post.id,
      person_id: inserted_person.id,
      score: 1,
    };

    PostLike::like(conn, &post_like).unwrap();

    let post_aggs_before_delete = PostAggregates::read(conn, inserted_post.id).unwrap();

    assert_eq!(2, post_aggs_before_delete.comments);
    assert_eq!(1, post_aggs_before_delete.score);
    assert_eq!(1, post_aggs_before_delete.upvotes);
    assert_eq!(0, post_aggs_before_delete.downvotes);

    // Add a post dislike from the other person
    let post_dislike = PostLikeForm {
      post_id: inserted_post.id,
      person_id: another_inserted_person.id,
      score: -1,
    };

    PostLike::like(conn, &post_dislike).unwrap();

    let post_aggs_after_dislike = PostAggregates::read(conn, inserted_post.id).unwrap();

    assert_eq!(2, post_aggs_after_dislike.comments);
    assert_eq!(0, post_aggs_after_dislike.score);
    assert_eq!(1, post_aggs_after_dislike.upvotes);
    assert_eq!(1, post_aggs_after_dislike.downvotes);

    // Remove the comments
    Comment::delete(conn, inserted_comment.id).unwrap();
    Comment::delete(conn, inserted_child_comment.id).unwrap();
    let after_comment_delete = PostAggregates::read(conn, inserted_post.id).unwrap();
    assert_eq!(0, after_comment_delete.comments);
    assert_eq!(0, after_comment_delete.score);
    assert_eq!(1, after_comment_delete.upvotes);
    assert_eq!(1, after_comment_delete.downvotes);

    // Remove the first post like
    PostLike::remove(conn, inserted_person.id, inserted_post.id).unwrap();
    let after_like_remove = PostAggregates::read(conn, inserted_post.id).unwrap();
    assert_eq!(0, after_like_remove.comments);
    assert_eq!(-1, after_like_remove.score);
    assert_eq!(0, after_like_remove.upvotes);
    assert_eq!(1, after_like_remove.downvotes);

    // This should delete all the associated rows, and fire triggers
    Person::delete(conn, another_inserted_person.id).unwrap();
    let person_num_deleted = Person::delete(conn, inserted_person.id).unwrap();
    assert_eq!(1, person_num_deleted);

    // Delete the community
    let community_num_deleted = Community::delete(conn, inserted_community.id).unwrap();
    assert_eq!(1, community_num_deleted);

    // Should be none found, since the creator was deleted
    let after_delete = PostAggregates::read(conn, inserted_post.id);
    assert!(after_delete.is_err());

    Instance::delete(conn, inserted_instance.id).unwrap();
  }
}