Module: JadeSql::Runtime

Extended by:
Jade::Port
Defined in:
lib/jade-sql/runtime.rb

Constant Summary collapse

PG_ARRAY_LITERAL =

PG arrays render as {}, {a,b,c}, {"a,b","c"}, with NULL as bare NULL. Quoted elements escape " and \ with backslashes. The JSON-object guard rejects {"key":...} shapes — they share the outer braces but should reach Decode.Value as plain strings (or as Hash if AR already typecast the column).

/\A\{.*\}\z/m
JSON_OBJECT_HEAD = 
/\A\{\s*"[^"]*"\s*:/m
NOW_TOKEN =

Sql.Mutation.timestamped emits "$JADE_SQL_NOW$" where created_at / updated_at go. Swap it for one UTC timestamp literal per statement, computed here — the app clock, so it moves with travel_to/Timecop (unlike DB now()). The token lives in SQL we generate, never in a bound value, so it can't collide with user data.

"$JADE_SQL_NOW$"
QUOTED_OR_PLACEHOLDER =

Sql renders ? placeholders uniformly. AR's exec_query/exec_update path on the PG adapter expects $1, $2, … — there is no ?-to-$n rewrite at that layer. SQLite and MySQL accept ? directly, so this is a no-op there.

The alternation matches a whole quoted span first (single-quoted string with '' escapes, or double-quoted identifier with "" escapes), so a literal ? inside one is left alone — only bare ? outside quotes becomes a placeholder. Dollar-quoted bodies aren't handled (uncommon in app SQL).

/'(?:[^']|'')*'|"(?:[^"]|"")*"|\?/

Class Method Summary collapse

Class Method Details

.adapt_sql(sql, conn) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 214

def self.adapt_sql(sql, conn)
  return sql unless conn.adapter_name =~ /postgres/i

  n = 0
  sql.gsub(QUOTED_OR_PLACEHOLDER) { |m| m == "?" ? "$#{n += 1}" : m }
end

.array_type_for(elements) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 240

def self.array_type_for(elements)
  sample = elements.find { |e| !e.nil? }
  element_type =
    case sample
    when ::Integer            then ::ActiveRecord::Type::Integer.new
    when ::Float              then ::ActiveRecord::Type::Float.new
    when true, false          then ::ActiveRecord::Type::Boolean.new
    else                           ::ActiveRecord::Type::String.new
    end

  ::ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Array.new(element_type)
end

.coerce_row(row) ⇒ Object

AR's PG adapter returns ::Date / ::Time for date/timestamp columns; Calendar.Date / Clock.Instant decoders expect ISO strings. Coerce at the boundary so callers don't sprinkle text_cast in every SELECT.

text / int / etc. arrive as Postgres array literals ({a,b,c}) when AR's exec_query path doesn't run the OID typecast. Parse them back to Ruby Arrays so Decode.list(...) works the same as for any other List(a) column.

numeric/decimal columns come back as ::BigDecimal; the schema generator maps them to jade's stdlib Decimal, whose decoder reads the exact "e" wire form. Float would lose precision, so don't. Most rows have nothing to convert — Integers, plain Strings and nils all come back as themselves — so the copy only happens once a value actually changes, and each value is still only looked at once.



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# File 'lib/jade-sql/runtime.rb', line 87

def self.coerce_row(row)
  out = nil

  row.each_pair do |k, v|
    coerced = coerce_value(v)
    (out ||= row.dup)[k] = coerced unless coerced.equal?(v)
  end

  out || row
end

.coerce_value(v) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 98

def self.coerce_value(v)
  case v
  when ::Date             then v.iso8601
  when ::Time, ::DateTime then v.iso8601
  when ::BigDecimal       then decimal_wire(v)
  when ::String
    pg_array_literal?(v) ? parse_pg_array(v) : v
  else v
  end
end

.constraint_name(error) ⇒ Object

The constraint/index name behind a RecordNotUnique, so callers can route by which unique index was violated. PG reports it in the error's diagnostics; other adapters (or a missing name) fall back to "".



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# File 'lib/jade-sql/runtime.rb', line 179

def self.constraint_name(error)
  cause = error.cause
  return "" unless defined?(::PG::Result) && cause.respond_to?(:result) && cause.result

  cause.result.error_field(::PG::Result::PG_DIAG_CONSTRAINT_NAME) || ""
rescue StandardError
  ""
end

.decimal_wire(v) ⇒ Object

::BigDecimal -> "e" with value = coeff * 10^exp, exactly (BigDecimal#split gives sign, significant digits, and a base-10 exponent). Matches the wire form jade's stdlib Decimal decoder parses.

'NaN'/'Infinity'::numeric are legal Postgres values that Decimal can't represent; fail loudly rather than silently decode them as 0.

Raises:

  • (ArgumentError) 


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# File 'lib/jade-sql/runtime.rb', line 115

def self.decimal_wire(v)
  raise ArgumentError, "non-finite numeric: #{v}" unless v.finite?

  sign, digits, _base, exp = v.split
  coefficient = sign * digits.to_i
  exponent = exp - digits.length
  "#{coefficient}e#{exponent}"
end

.decode_element(raw) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 172

def self.decode_element(raw)
  raw == "NULL" ? nil : raw
end

.fill_now(sql) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 195

def self.fill_now(sql)
  return sql unless sql.include?(NOW_TOKEN)

  stamp = "'#{::Time.now.utc.strftime('%Y-%m-%d %H:%M:%S.%6N+00')}'"
  sql.gsub(NOW_TOKEN) { stamp }
end

.parse_pg_array(s) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 136

def self.parse_pg_array(s)
  inner = s[1..-2]
  return [] if inner.empty?

  elements = []
  buffer = String.new
  in_quotes = false
  i = 0
  while i < inner.length
    c = inner[i]
    if in_quotes
      if c == '\\' && i + 1 < inner.length
        buffer << inner[i + 1]
        i += 2
        next
      elsif c == '"'
        in_quotes = false
      else
        buffer << c
      end
    else
      if c == '"'
        in_quotes = true
      elsif c == ','
        elements << decode_element(buffer)
        buffer = String.new
      else
        buffer << c
      end
    end
    i += 1
  end
  elements << decode_element(buffer)
  elements
end

.pg_array_literal?(s) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jade-sql/runtime.rb', line 132

def self.pg_array_literal?(s)
  s.match?(PG_ARRAY_LITERAL) && !s.match?(JSON_OBJECT_HEAD)
end

.typed_param(value) ⇒ Object 



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# File 'lib/jade-sql/runtime.rb', line 231

def self.typed_param(value)
  case value
  when ::Array
    ::ActiveRecord::Relation::QueryAttribute.new(nil, value, array_type_for(value))
  else
    value
  end
end

.typed_params(params, conn) ⇒ Object

AR's exec_query raw path can't bind a Ruby Array — pg's OID type cast isn't applied to bare values. Wrap arrays in QueryAttribute with a PG OID::Array so the binding picks the right wire format. Element type sniffs the first non-nil entry; falls back to text.



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# File 'lib/jade-sql/runtime.rb', line 225

def self.typed_params(params, conn)
  return params unless conn.adapter_name =~ /postgres/i

  params.map { |p| typed_param(p) }
end