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bdfr-browser/lib/bdfr_browser/comment.ex

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defmodule BdfrBrowser.Comment do
use Ecto.Schema
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import Ecto.Query, only: [from: 2]
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alias BdfrBrowser.Post
@primary_key {:id, :string, autogenerate: false}
@foreign_key_type :string
schema "comments" do
field :author, :string
field :body, :string
field :score, :integer
field :posted_at, :utc_datetime
belongs_to :post, Post
belongs_to :parent, __MODULE__
has_many :children, __MODULE__, foreign_key: :parent_id
end
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def by_author(author) do
from(c in __MODULE__,
join: p in assoc(c, :post),
join: s in assoc(p, :subreddit),
select: %{
body: c.body,
children: [],
posted_at: c.posted_at,
subreddit: s.name,
post_id: p.id,
post_title: p.title,
post_date: fragment("to_char(?, 'YYYY-MM')", p.posted_at)
},
where: c.author == ^author,
order_by: [desc: c.posted_at],
group_by: [c.id, p.id, s.name]
)
end
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end