module Tablo::CellType

Overview

In each Tablo cell, the value attribute contains a raw value, either read from the data source or defined in the program source code.

This attribute is of type CellType and can therefore only store values of this type. To make this possible, each type intended for use in Tablo must include the CellType module, an empty module defined as follows:

module CellType
end

In Tablo, most scalar types already benefit from this addition, i.e. :

• Signed integers: Int8, Int16, Int32, Int64, Int128
• Unsigned integers: UInt8, UInt16, UInt32, UInt64, UInt128
• Floats: Float32, Float64
• Misc : Char, String, Bool, Nil, Symbol, Time

If another data type is to be used in Tablo, we need to reopen the type and include the CellType module, as in the case of the BigDecimal type below:

struct BigDecimal
  include Tablo::CellType
end

Important:
After initialization of a Tablo table, when data is read for processing before being displayed, its type is therefore restricted to Tablo::CellType. So, in most cases, a reverse casting is required when operations are performed on it, such as:

- value.as(String)
- value.as(Float64)
- value.as(Int32)
- ...

Defined in:

types.cr