return postdto from post create
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15 changed files with 226 additions and 111 deletions
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@ -6,4 +6,6 @@ public record PostDto(
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IList<PostMediaDto> Media,
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DateTimeOffset CreatedAt,
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PostAuthorDto Author,
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IList<PostReactionDto> Reactions);
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IList<PostReactionDto> Reactions,
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IEnumerable<string> PossibleReactions
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);
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@ -1,3 +1,4 @@
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using System.Text.Json;
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using Dapper;
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using Femto.Common.Infrastructure.DbConnection;
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using Femto.Modules.Blog.Application.Queries.GetPosts.Dto;
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@ -15,42 +16,29 @@ public class GetPostsQueryHandler(IDbConnectionFactory connectionFactory)
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{
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using var conn = connectionFactory.GetConnection();
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var orderBy = query.Direction is GetPostsDirection.Backward ? "desc" : "asc";
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var pageFilter = query.Direction is GetPostsDirection.Backward ? "<=" : ">=";
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var username = query.Author;
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var authorGuid = query.AuthorId;
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var cursor = query.From;
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var showPrivate = query.CurrentUserId is not null;
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// lang=sql
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var sql = $$"""
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with page as (
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select blog.post.*, blog.author.username as Username, blog.author.id as AuthorId
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from blog.post
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inner join blog.author on blog.author.id = blog.post.author_id
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where (@username is null or blog.author.username = @username)
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and (@showPrivate or blog.post.is_public = true)
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and (@authorGuid is null or blog.author.id = @authorGuid)
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and (@cursor is null or blog.post.id {{pageFilter}} @cursor)
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order by blog.post.id {{orderBy}}
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limit @amount
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)
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select
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page.id as PostId,
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page.content as Content,
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blog.post_media.url as MediaUrl,
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blog.post_media.width as MediaWidth,
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blog.post_media.height as MediaHeight,
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page.posted_on as PostedOn,
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page.Username,
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page.AuthorId
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from page
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left join blog.post_media on blog.post_media.post_id = page.id
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order by page.id {{orderBy}}
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""";
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var result = await conn.QueryAsync<QueryResult>(
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sql,
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var loadPostsResult = await conn.QueryAsync<LoadPostRow>(
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"""
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select
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blog.post.id as PostId,
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blog.post.content as Content,
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blog.post.posted_on as PostedOn,
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blog.author.username as Username,
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blog.author.id as AuthorId,
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blog.post.possible_reactions as PossibleReactions
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from blog.post
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inner join blog.author on blog.author.id = blog.post.author_id
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where (@username is null or blog.author.username = @username)
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and (@showPrivate or blog.post.is_public = true)
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and (@authorGuid is null or blog.author.id = @authorGuid)
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and (@cursor is null or blog.post.id <= @cursor)
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order by blog.post.id desc
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limit @amount
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""",
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new
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{
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username,
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@ -62,54 +50,115 @@ public class GetPostsQueryHandler(IDbConnectionFactory connectionFactory)
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}
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);
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var rows = result.ToList();
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var loadedPosts = loadPostsResult.ToList();
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var posts = loadedPosts.Take(query.Amount).ToList();
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var next = loadedPosts.LastOrDefault()?.PostId;
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var posts = rows.GroupBy(row => row.PostId)
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.Select(group =>
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{
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var postId = group.Key;
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var post = group.First();
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var media = group
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.Select(row =>
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{
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if (row.MediaUrl is not null)
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{
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return new PostMediaDto(
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new Uri(row.MediaUrl),
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row.MediaHeight,
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row.MediaHeight
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);
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}
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else
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return null;
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})
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.OfType<PostMediaDto>()
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.ToList();
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return new PostDto(
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postId,
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post.Content,
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media,
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post.PostedOn,
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new PostAuthorDto(post.AuthorId, post.Username)
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);
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})
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.ToList();
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var postIds = posts.Select(p => p.PostId).ToList();
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var next = rows.Count >= query.Amount ? rows.LastOrDefault()?.PostId : null;
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var loadMediaResult = await conn.QueryAsync<LoadMediaRow>(
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"""
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select
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pm.url as MediaUrl,
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pm.type as MediaType,
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pm.width as MediaWidth,
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pm.height as MediaHeight,
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pm.post_id as PostId
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from blog.post_media pm where pm.post_id = ANY (@postIds)
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order by pm.ordering
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""",
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new { postIds }
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);
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return new GetPostsQueryResult(posts, next);
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var loadReactionsResult = await conn.QueryAsync<LoadReactionRow>(
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"""
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select
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pr.post_id as PostId,
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pr.author_id as AuthorId,
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pr.emoji as Emoji
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from blog.post_reaction pr
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where pr.post_id = ANY (@postIds)
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""",
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new { postIds }
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);
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var reactionsByPostId = loadReactionsResult
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.GroupBy(r => r.PostId)
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.ToDictionary(
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group => group.Key,
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group =>
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group
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.GroupBy(
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r => r.Emoji,
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(key, g) =>
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{
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var reactions = g.ToList();
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return new PostReactionDto(
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key,
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reactions.Count,
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reactions.Any(r => r.AuthorId == query.CurrentUserId)
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);
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}
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)
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.ToList()
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);
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var mediaByPostId = loadMediaResult
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.GroupBy(m => m.PostId)
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.ToDictionary(
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g => g.Key,
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g =>
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g.Select(m => new PostMediaDto(
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new Uri(m.MediaUrl),
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m.MediaWidth,
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m.MediaHeight
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))
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.ToList()
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);
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return new GetPostsQueryResult(
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posts
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.Select(p => new PostDto(
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p.PostId,
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p.Content,
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mediaByPostId.TryGetValue(p.PostId, out var mediaDtos) ? mediaDtos : [],
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p.PostedOn,
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new PostAuthorDto(p.AuthorId, p.Username),
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reactionsByPostId.TryGetValue(p.PostId, out var reactionDtos)
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? reactionDtos.ToList()
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: [],
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!string.IsNullOrEmpty(p.PossibleReactions)
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? JsonSerializer.Deserialize<IEnumerable<string>>(p.PossibleReactions)!
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: []
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))
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.ToList(),
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next
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);
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}
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internal class QueryResult
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internal record LoadPostRow
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{
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public Guid PostId { get; set; }
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public string Content { get; set; }
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public string? MediaUrl { get; set; }
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public string? MediaType { get; set; }
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public int? MediaWidth { get; set; }
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public int? MediaHeight { get; set; }
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public DateTimeOffset PostedOn { get; set; }
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public Guid AuthorId { get; set; }
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public string Username { get; set; }
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public Guid PostId { get; init; }
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public string Content { get; init; }
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public DateTimeOffset PostedOn { get; init; }
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public string Username { get; init; }
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public Guid AuthorId { get; init; }
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public string? PossibleReactions { get; init; }
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}
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internal record LoadMediaRow
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{
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public string MediaUrl { get; init; }
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public string? MediaType { get; init; }
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public int? MediaWidth { get; init; }
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public int? MediaHeight { get; init; }
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public Guid PostId { get; init; }
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}
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internal record LoadReactionRow
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{
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public Guid PostId { get; init; }
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public Guid AuthorId { get; init; }
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public string Emoji { get; init; }
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}
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}
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