Need help creating a GET route - json

Question

I need help implement a route to fetch all blog posts by author_ids.
The post that we're fetching needs to have at least one of the authors specified in the passed in author_ids parameters. I've created a helper function to help me fetch all blog posts by their ID, Post.get_posts_by_user_id
I also need to sort the posts by query parameters given. Also, I need to delete any duplicated posts as efficiently as possible.
I'm stumped here because of the way author_ids is being given. (I'm extremely new to Ruby)
This is what we should get returned from the route: "posts": [{"id": 1, "likes": 960, "popularity": 0.13, "reads": 50361, "tags": ["tech", "health"], text": "Some text here."}, ... ]
Query parameters expected to be given to this route
Update:
After creating the index method, it seems that it is only getting one post rather than getting all posts that are associated with the passed in authorIds.
def index
posts = current_user
.posts
.where(id: params[:authorIds].split(','))
.order(sort_column => sort_direction)
if posts
render json: { post: posts }, status: :ok
else
render json: {error: posts.errors}, status: :unprocessable_entity
end
end
Test cases
Update 2:
Post Model:
class Post < ApplicationRecord
# Associations
has_many :user_posts
has_many :users, through: :user_posts, dependent: :destroy
# Validations
validates :text, presence: true, length: { minimum: 3 }
validates :popularity, inclusion: { in: 0.0..1.0 }
def tags
if super
super.split(",")
end
end
def tags=(value)
if value.kind_of? Array
super value.join(",")
else
super value
end
end
def self.get_posts_by_user_id(user_id)
Post.joins(:user_posts).where(user_posts: { user_id: user_id })
end
end
User Model:
class User < ApplicationRecord
has_secure_password
# Associations
has_many :user_posts
has_many :posts, through: :user_posts, dependent: :destroy
# Validations
validates :username, :password, presence: true
validates :password, length: { minimum: 6 }
validates :username, uniqueness: true
end
User_post Model:
class UserPost < ApplicationRecord
belongs_to :user
belongs_to :post
end

Answer 1

I would do it like below.
def index
author_ids_array = params[:ids].to_s.split(',')
Post
.get_posts_by_user_id(author_ids_array)
.order(sort_column => sort_direction)
end
private
def sort_column
allow_list = %w[id reads likes popularity]
params[:sortBy].presence_in(allow_list) || allow_list.first
end
def sort_direction
allow_list = %w[asc desc]
params[:direction].presence_in(allow_list) || allow_list.first
end