lemmy/server/lemmy_db/src/comment.rs

use super::post::Post;
use crate::{
  naive_now,
  schema::{comment, comment_like, comment_saved},
  Crud,
  Likeable,
  Saveable,
};
use diesel::{dsl::*, result::Error, *};
use serde::{Deserialize, Serialize};
use url::{ParseError, Url};

// WITH RECURSIVE MyTree AS (
//     SELECT * FROM comment WHERE parent_id IS NULL
//     UNION ALL
//     SELECT m.* FROM comment AS m JOIN MyTree AS t ON m.parent_id = t.id
// )
// SELECT * FROM MyTree;

#[derive(Clone, Queryable, Associations, Identifiable, PartialEq, Debug, Serialize, Deserialize)]
#[belongs_to(Post)]
#[table_name = "comment"]
pub struct Comment {
  pub id: i32,
  pub creator_id: i32,
  pub post_id: i32,
  pub parent_id: Option<i32>,
  pub content: String,
  pub removed: bool,
  pub read: bool, // Whether the recipient has read the comment or not
  pub published: chrono::NaiveDateTime,
  pub updated: Option<chrono::NaiveDateTime>,
  pub deleted: bool,
  pub ap_id: String,
  pub local: bool,
}

#[derive(Insertable, AsChangeset, Clone)]
#[table_name = "comment"]
pub struct CommentForm {
  pub creator_id: i32,
  pub post_id: i32,
  pub parent_id: Option<i32>,
  pub content: String,
  pub removed: Option<bool>,
  pub read: Option<bool>,
  pub published: Option<chrono::NaiveDateTime>,
  pub updated: Option<chrono::NaiveDateTime>,
  pub deleted: Option<bool>,
  pub ap_id: Option<String>,
  pub local: bool,
}

impl CommentForm {
  pub fn get_ap_id(&self) -> Result<Url, ParseError> {
    Url::parse(&self.ap_id.as_ref().unwrap_or(&"not_a_url".to_string()))
  }
}

impl Crud<CommentForm> for Comment {
  fn read(conn: &PgConnection, comment_id: i32) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    comment.find(comment_id).first::<Self>(conn)
  }

  fn delete(conn: &PgConnection, comment_id: i32) -> Result<usize, Error> {
    use crate::schema::comment::dsl::*;
    diesel::delete(comment.find(comment_id)).execute(conn)
  }

  fn create(conn: &PgConnection, comment_form: &CommentForm) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    insert_into(comment)
      .values(comment_form)
      .get_result::<Self>(conn)
  }

  fn update(
    conn: &PgConnection,
    comment_id: i32,
    comment_form: &CommentForm,
  ) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.find(comment_id))
      .set(comment_form)
      .get_result::<Self>(conn)
  }
}

impl Comment {
  pub fn update_ap_id(
    conn: &PgConnection,
    comment_id: i32,
    apub_id: String,
  ) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;

    diesel::update(comment.find(comment_id))
      .set(ap_id.eq(apub_id))
      .get_result::<Self>(conn)
  }

  pub fn read_from_apub_id(conn: &PgConnection, object_id: &str) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    comment.filter(ap_id.eq(object_id)).first::<Self>(conn)
  }

  pub fn permadelete_for_creator(
    conn: &PgConnection,
    for_creator_id: i32,
  ) -> Result<Vec<Self>, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.filter(creator_id.eq(for_creator_id)))
      .set((
        content.eq("*Permananently Deleted*"),
        deleted.eq(true),
        updated.eq(naive_now()),
      ))
      .get_results::<Self>(conn)
  }

  pub fn update_deleted(
    conn: &PgConnection,
    comment_id: i32,
    new_deleted: bool,
  ) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.find(comment_id))
      .set((deleted.eq(new_deleted), updated.eq(naive_now())))
      .get_result::<Self>(conn)
  }

  pub fn update_removed(
    conn: &PgConnection,
    comment_id: i32,
    new_removed: bool,
  ) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.find(comment_id))
      .set((removed.eq(new_removed), updated.eq(naive_now())))
      .get_result::<Self>(conn)
  }

  pub fn update_removed_for_creator(
    conn: &PgConnection,
    for_creator_id: i32,
    new_removed: bool,
  ) -> Result<Vec<Self>, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.filter(creator_id.eq(for_creator_id)))
      .set((removed.eq(new_removed), updated.eq(naive_now())))
      .get_results::<Self>(conn)
  }

  pub fn update_read(conn: &PgConnection, comment_id: i32, new_read: bool) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.find(comment_id))
      .set(read.eq(new_read))
      .get_result::<Self>(conn)
  }

  pub fn update_content(
    conn: &PgConnection,
    comment_id: i32,
    new_content: &str,
  ) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    diesel::update(comment.find(comment_id))
      .set((content.eq(new_content), updated.eq(naive_now())))
      .get_result::<Self>(conn)
  }

  pub fn upsert(conn: &PgConnection, comment_form: &CommentForm) -> Result<Self, Error> {
    use crate::schema::comment::dsl::*;
    insert_into(comment)
      .values(comment_form)
      .on_conflict(ap_id)
      .do_update()
      .set(comment_form)
      .get_result::<Self>(conn)
  }
}

#[derive(Identifiable, Queryable, Associations, PartialEq, Debug, Clone)]
#[belongs_to(Comment)]
#[table_name = "comment_like"]
pub struct CommentLike {
  pub id: i32,
  pub user_id: i32,
  pub comment_id: i32,
  pub post_id: i32,
  pub score: i16,
  pub published: chrono::NaiveDateTime,
}

#[derive(Insertable, AsChangeset, Clone)]
#[table_name = "comment_like"]
pub struct CommentLikeForm {
  pub user_id: i32,
  pub comment_id: i32,
  pub post_id: i32,
  pub score: i16,
}

impl Likeable<CommentLikeForm> for CommentLike {
  fn like(conn: &PgConnection, comment_like_form: &CommentLikeForm) -> Result<Self, Error> {
    use crate::schema::comment_like::dsl::*;
    insert_into(comment_like)
      .values(comment_like_form)
      .get_result::<Self>(conn)
  }
  fn remove(conn: &PgConnection, user_id: i32, comment_id: i32) -> Result<usize, Error> {
    use crate::schema::comment_like::dsl;
    diesel::delete(
      dsl::comment_like
        .filter(dsl::comment_id.eq(comment_id))
        .filter(dsl::user_id.eq(user_id)),
    )
    .execute(conn)
  }
}

#[derive(Identifiable, Queryable, Associations, PartialEq, Debug)]
#[belongs_to(Comment)]
#[table_name = "comment_saved"]
pub struct CommentSaved {
  pub id: i32,
  pub comment_id: i32,
  pub user_id: i32,
  pub published: chrono::NaiveDateTime,
}

#[derive(Insertable, AsChangeset, Clone)]
#[table_name = "comment_saved"]
pub struct CommentSavedForm {
  pub comment_id: i32,
  pub user_id: i32,
}

impl Saveable<CommentSavedForm> for CommentSaved {
  fn save(conn: &PgConnection, comment_saved_form: &CommentSavedForm) -> Result<Self, Error> {
    use crate::schema::comment_saved::dsl::*;
    insert_into(comment_saved)
      .values(comment_saved_form)
      .get_result::<Self>(conn)
  }
  fn unsave(conn: &PgConnection, comment_saved_form: &CommentSavedForm) -> Result<usize, Error> {
    use crate::schema::comment_saved::dsl::*;
    diesel::delete(
      comment_saved
        .filter(comment_id.eq(comment_saved_form.comment_id))
        .filter(user_id.eq(comment_saved_form.user_id)),
    )
    .execute(conn)
  }
}

#[cfg(test)]
mod tests {
  use crate::{
    comment::*,
    community::*,
    post::*,
    tests::establish_unpooled_connection,
    user::*,
    Crud,
    ListingType,
    SortType,
  };

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

    let new_user = UserForm {
      name: "terry".into(),
      preferred_username: None,
      password_encrypted: "nope".into(),
      email: None,
      matrix_user_id: None,
      avatar: None,
      banner: None,
      admin: false,
      banned: false,
      updated: None,
      show_nsfw: false,
      theme: "darkly".into(),
      default_sort_type: SortType::Hot as i16,
      default_listing_type: ListingType::Subscribed as i16,
      lang: "browser".into(),
      show_avatars: true,
      send_notifications_to_email: false,
      actor_id: None,
      bio: None,
      local: true,
      private_key: None,
      public_key: None,
      last_refreshed_at: None,
    };

    let inserted_user = User_::create(&conn, &new_user).unwrap();

    let new_community = CommunityForm {
      name: "test community".to_string(),
      title: "nada".to_owned(),
      description: None,
      category_id: 1,
      creator_id: inserted_user.id,
      removed: None,
      deleted: None,
      updated: None,
      nsfw: false,
      actor_id: None,
      local: true,
      private_key: None,
      public_key: None,
      last_refreshed_at: None,
      published: None,
      banner: None,
      icon: None,
    };

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

    let new_post = PostForm {
      name: "A test post".into(),
      creator_id: inserted_user.id,
      url: None,
      body: None,
      community_id: inserted_community.id,
      removed: None,
      deleted: None,
      locked: None,
      stickied: None,
      updated: None,
      nsfw: false,
      embed_title: None,
      embed_description: None,
      embed_html: None,
      thumbnail_url: None,
      ap_id: None,
      local: true,
      published: None,
    };

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

    let comment_form = CommentForm {
      content: "A test comment".into(),
      creator_id: inserted_user.id,
      post_id: inserted_post.id,
      removed: None,
      deleted: None,
      read: None,
      parent_id: None,
      published: None,
      updated: None,
      ap_id: None,
      local: true,
    };

    let inserted_comment = Comment::create(&conn, &comment_form).unwrap();

    let expected_comment = Comment {
      id: inserted_comment.id,
      content: "A test comment".into(),
      creator_id: inserted_user.id,
      post_id: inserted_post.id,
      removed: false,
      deleted: false,
      read: false,
      parent_id: None,
      published: inserted_comment.published,
      updated: None,
      ap_id: inserted_comment.ap_id.to_owned(),
      local: true,
    };

    let child_comment_form = CommentForm {
      content: "A child comment".into(),
      creator_id: inserted_user.id,
      post_id: inserted_post.id,
      parent_id: Some(inserted_comment.id),
      removed: None,
      deleted: None,
      read: None,
      published: None,
      updated: None,
      ap_id: None,
      local: true,
    };

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

    // Comment Like
    let comment_like_form = CommentLikeForm {
      comment_id: inserted_comment.id,
      post_id: inserted_post.id,
      user_id: inserted_user.id,
      score: 1,
    };

    let inserted_comment_like = CommentLike::like(&conn, &comment_like_form).unwrap();

    let expected_comment_like = CommentLike {
      id: inserted_comment_like.id,
      comment_id: inserted_comment.id,
      post_id: inserted_post.id,
      user_id: inserted_user.id,
      published: inserted_comment_like.published,
      score: 1,
    };

    // Comment Saved
    let comment_saved_form = CommentSavedForm {
      comment_id: inserted_comment.id,
      user_id: inserted_user.id,
    };

    let inserted_comment_saved = CommentSaved::save(&conn, &comment_saved_form).unwrap();

    let expected_comment_saved = CommentSaved {
      id: inserted_comment_saved.id,
      comment_id: inserted_comment.id,
      user_id: inserted_user.id,
      published: inserted_comment_saved.published,
    };

    let read_comment = Comment::read(&conn, inserted_comment.id).unwrap();
    let updated_comment = Comment::update(&conn, inserted_comment.id, &comment_form).unwrap();
    let like_removed = CommentLike::remove(&conn, inserted_user.id, inserted_comment.id).unwrap();
    let saved_removed = CommentSaved::unsave(&conn, &comment_saved_form).unwrap();
    let num_deleted = Comment::delete(&conn, inserted_comment.id).unwrap();
    Comment::delete(&conn, inserted_child_comment.id).unwrap();
    Post::delete(&conn, inserted_post.id).unwrap();
    Community::delete(&conn, inserted_community.id).unwrap();
    User_::delete(&conn, inserted_user.id).unwrap();

    assert_eq!(expected_comment, read_comment);
    assert_eq!(expected_comment, inserted_comment);
    assert_eq!(expected_comment, updated_comment);
    assert_eq!(expected_comment_like, inserted_comment_like);
    assert_eq!(expected_comment_saved, inserted_comment_saved);
    assert_eq!(
      expected_comment.id,
      inserted_child_comment.parent_id.unwrap()
    );
    assert_eq!(1, like_removed);
    assert_eq!(1, saved_removed);
    assert_eq!(1, num_deleted);
  }
}