ExTeal v0.21.0

ExTeal.Metric.TrendExpression behaviour (ExTeal v0.21.0) View Source

Behaviour for trend expression builders

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Types

valid_timezone()

Callbacks

generate( query, metric, timezone, unit, start_dt )

Use database specifc syntax to build an expression for both selecting and grouping by a given unit of time. The function uses select_merge to build a date_result value assuming that a previous select has been used to generate a query for the aggregate.

Functions

fetch_offset(timezone, datetime)

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valid_timezone()

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Specs

valid_timezone() :: String.t() | integer() | :utc | :local

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generate( query, metric, timezone, unit, start_dt )

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Specs

generate(
  query :: Ecto.Queryable.t(),
  metric :: module(),
  timezone :: String.t(),
  unit :: String.t(),
  start_dt :: DateTime.t()
) :: Ecto.Queryable.t()

Use database specifc syntax to build an expression for both selecting and grouping by a given unit of time. The function uses select_merge to build a date_result value assuming that a previous select has been used to generate a query for the aggregate.

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fetch_offset(timezone, datetime)

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Specs

fetch_offset(timezone :: String.t(), datetime :: DateTime.t()) :: float()