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5f64fd0a21
Introduce new patterns for direct sql that are safe and fast. MiniSql is not prone to memory bloat that can happen with direct PG usage. It also has an extremely fast materializer and very a convenient API - DB.exec(sql, *params) => runs sql returns row count - DB.query(sql, *params) => runs sql returns usable objects (not a hash) - DB.query_hash(sql, *params) => runs sql returns an array of hashes - DB.query_single(sql, *params) => runs sql and returns a flat one dimensional array - DB.build(sql) => returns a sql builder See more at: https://github.com/discourse/mini_sql
43 lines
1.1 KiB
Ruby
43 lines
1.1 KiB
Ruby
class DraftSequence < ActiveRecord::Base
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def self.next!(user, key)
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user_id = user
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user_id = user.id unless user.is_a?(Integer)
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return 0 if user_id < 0
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h = { user_id: user_id, draft_key: key }
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c = DraftSequence.find_by(h)
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c ||= DraftSequence.new(h)
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c.sequence ||= 0
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c.sequence += 1
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c.save!
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DB.exec("DELETE FROM drafts WHERE user_id = :user_id AND draft_key = :draft_key AND sequence < :sequence", draft_key: key, user_id: user_id, sequence: c.sequence)
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c.sequence
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end
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def self.current(user, key)
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return nil unless user
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user_id = user
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user_id = user.id unless user.is_a?(Integer)
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# perf critical path
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r, _ = DB.query_single('select sequence from draft_sequences where user_id = ? and draft_key = ?', user_id, key)
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r.to_i
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end
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end
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# == Schema Information
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#
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# Table name: draft_sequences
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#
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# id :integer not null, primary key
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# user_id :integer not null
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# draft_key :string not null
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# sequence :integer not null
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#
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# Indexes
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#
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# index_draft_sequences_on_user_id_and_draft_key (user_id,draft_key) UNIQUE
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#
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