discourse/app/models/draft.rb

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# frozen_string_literal: true
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class Draft < ActiveRecord::Base
NEW_TOPIC ||= 'new_topic'
NEW_PRIVATE_MESSAGE ||= 'new_private_message'
EXISTING_TOPIC ||= 'topic_'
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def self.set(user, key, sequence, data)
if d = find_draft(user, key)
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return if d.sequence > sequence
DB.exec(<<~SQL, id: d.id, sequence: sequence, data: data)
UPDATE drafts
SET sequence = :sequence
, data = :data
, revisions = revisions + 1
WHERE id = :id
SQL
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else
Draft.create!(user_id: user.id, draft_key: key, data: data, sequence: sequence)
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end
true
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end
def self.get(user, key, sequence)
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d = find_draft(user, key)
d.data if d && d.sequence == sequence
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end
def self.clear(user, key, sequence)
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d = find_draft(user, key)
d.destroy if d && d.sequence <= sequence
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end
def self.find_draft(user, key)
if user.is_a?(User)
find_by(user_id: user.id, draft_key: key)
else
find_by(user_id: user, draft_key: key)
end
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end
def self.stream(opts = nil)
opts ||= {}
user_id = opts[:user].id
offset = (opts[:offset] || 0).to_i
limit = (opts[:limit] || 30).to_i
# JOIN of topics table based on manipulating draft_key seems imperfect
builder = DB.build <<~SQL
SELECT
d.*, t.title, t.id topic_id, t.archetype,
t.category_id, t.closed topic_closed, t.archived topic_archived,
pu.username, pu.name, pu.id user_id, pu.uploaded_avatar_id, pu.username_lower,
du.username draft_username, NULL as raw, NULL as cooked, NULL as post_number
FROM drafts d
LEFT JOIN LATERAL json_extract_path_text (d.data::json, 'postId') postId ON TRUE
LEFT JOIN posts p ON postId :: BIGINT = p.id
LEFT JOIN topics t ON
CASE
WHEN d.draft_key LIKE '%' || '#{EXISTING_TOPIC}' || '%'
THEN CAST(replace(d.draft_key, '#{EXISTING_TOPIC}', '') AS INT)
ELSE 0
END = t.id
JOIN users pu on pu.id = COALESCE(p.user_id, t.user_id, d.user_id)
JOIN users du on du.id = #{user_id}
/*where*/
/*order_by*/
/*offset*/
/*limit*/
SQL
builder
.where('d.user_id = :user_id', user_id: user_id.to_i)
.order_by('d.updated_at desc')
.offset(offset)
.limit(limit)
.query
end
def self.cleanup!
DB.exec(<<~SQL)
DELETE FROM drafts
WHERE sequence < (
SELECT MAX(s.sequence)
FROM draft_sequences s
WHERE s.draft_key = drafts.draft_key
AND s.user_id = drafts.user_id
)
SQL
# remove old drafts
delete_drafts_older_than_n_days = SiteSetting.delete_drafts_older_than_n_days.days.ago
Draft.where("updated_at < ?", delete_drafts_older_than_n_days).destroy_all
end
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end
# == Schema Information
#
# Table name: drafts
#
# id :integer not null, primary key
# user_id :integer not null
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# draft_key :string not null
# data :text not null
# created_at :datetime not null
# updated_at :datetime not null
# sequence :integer default(0), not null
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# revisions :integer default(1), not null
#
# Indexes
#
# index_drafts_on_user_id_and_draft_key (user_id,draft_key)
#