• Rémy Coutable's avatar
    Improve the performance of the GET /:sources/:id/{access_requests,members} API endpoints · 5010be77
    Rémy Coutable authored
    The performance was greatly improved by removing two N+1 queries issues
    for each endpoint.
    
    For comparison:
    
    1. `GET /projects/:id/members`
    
    With two N+1 queries issues (one was already fxed in the following
    snippet):
    
    ```
      ProjectMember Load (0.2ms)  SELECT "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL  ORDER BY "members"."id" DESC  [["source_type", "Project"],
    ["source_id", 1], ["source_type", "Project"]]
      User Load (0.5ms)  SELECT "users".* FROM "users" WHERE "users"."id" IN
    (5, 22, 16, 13)  ORDER BY "users"."id" DESC
      ActiveRecord::SchemaMigration Load (0.2ms)  SELECT
    "schema_migrations".* FROM "schema_migrations"
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL AND "members"."user_id" = $4  ORDER BY "members"."id" DESC LIMIT 1
    [["source_type", "Project"], ["source_id", 1], ["source_type",
    "Project"], ["user_id", 5]]
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL AND "members"."user_id" = $4  ORDER BY "members"."id" DESC LIMIT 1
    [["source_type", "Project"], ["source_id", 1], ["source_type",
    "Project"], ["user_id", 22]]
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL AND "members"."user_id" = $4  ORDER BY "members"."id" DESC LIMIT 1
    [["source_type", "Project"], ["source_id", 1], ["source_type",
    "Project"], ["user_id", 16]]
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL AND "members"."user_id" = $4  ORDER BY "members"."id" DESC LIMIT 1
    [["source_type", "Project"], ["source_id", 1], ["source_type",
    "Project"], ["user_id", 13]]
    ```
    
    Without the N+1 queries issues:
    
    ```
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND "members"."requested_at" IS
    NULL  ORDER BY "members"."id" DESC LIMIT 20 OFFSET 0  [["source_type",
    "Project"], ["source_id", 1], ["source_type", "Project"]]
      User Load (0.5ms)  SELECT "users".* FROM "users" WHERE "users"."id" IN
    (5, 22, 16, 13)  ORDER BY "users"."id" DESC
    ```
    
    2. `GET /projects/:id/access_requests`
    
    With two N+1 queries issues:
    
    ```
      ProjectMember Load (0.3ms)  SELECT "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND ("members"."requested_at" IS
    NOT NULL)  ORDER BY "members"."id" DESC  [["source_type", "Project"],
    ["source_id", 8], ["source_type", "Project"]]
      User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =
    $1  ORDER BY "users"."id" DESC LIMIT 1  [["id", 24]]
      User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" =
    $1  ORDER BY "users"."id" DESC LIMIT 1  [["id", 23]]
      ActiveRecord::SchemaMigration Load (0.2ms)  SELECT
    "schema_migrations".* FROM "schema_migrations"
      ProjectMember Load (0.1ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND ("members"."requested_at" IS
    NOT NULL) AND "members"."user_id" = $4  ORDER BY "members"."id" DESC
    LIMIT 1  [["source_type", "Project"], ["source_id", 8], ["source_type",
    "Project"], ["user_id", 24]]
      ProjectMember Load (0.2ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND ("members"."requested_at" IS
    NOT NULL) AND "members"."user_id" = $4  ORDER BY "members"."id" DESC
    LIMIT 1  [["source_type", "Project"], ["source_id", 8], ["source_type",
    "Project"], ["user_id", 23]]
    ```
    
    Without the N+1 queries issues:
    
    ```
      ProjectMember Load (0.3ms)  SELECT  "members".* FROM "members" WHERE
    "members"."source_type" = $1 AND "members"."type" IN ('ProjectMember')
    AND "members"."source_id" = $2 AND "members"."source_type" = $3 AND
    "members"."type" IN ('ProjectMember') AND ("members"."requested_at" IS
    NOT NULL)  ORDER BY "members"."id" DESC LIMIT 20 OFFSET 0
    [["source_type", "Project"], ["source_id", 8], ["source_type",
    "Project"]]
      User Load (0.5ms)  SELECT "users".* FROM "users" WHERE "users"."id" IN
    (24, 23)  ORDER BY "users"."id" DESC
    ```
    Signed-off-by: default avatarRémy Coutable <remy@rymai.me>
    5010be77
entities.rb 16.1 KB