class Cql::Column(T)

• Cql::Column(T)
• Cql::BaseColumn
• Reference
• Object

Overview

A column in a table This class represents a column in a table It provides methods for setting the column type, default value, and constraints It also provides methods for building expressions

Example Creating a new column

schema.define do
  table :users do
    column :name, String, null: false, default: "John"
    column :age, Int32, null: false
  end
end

Direct Known Subclasses

• Cql::PrimaryKey(T)

Defined in:

Constructors

• .new(name : Symbol, type : T.class, as_name : String | Nil = nil, null : Bool = false, default : DB::Any = nil, unique : Bool = false, size : Int32 | Nil = nil, index : Index | Nil = nil)

  Create a new column instance - @param : name (Symbol) - The name of the column - @param : type (Any) - The data type of the column - @param : as_name (String, nil) - An optional alias for the column - @param : null (Bool) - Whether the column allows null values (default: false) - @param : default (DB::Any) - The default value for the column (default: nil) - @param : unique (Bool) - Whether the column should have a unique constraint (default: false) - @param : size (Int32, nil) - The size of the column (default: nil) - @param : index (Index, nil) - The index for the column (default: nil) - @return : Nil - @raise : Cql::Error if the column type is not valid

Instance Method Summary

• #expression

  Expressions for this column - @return [Expression::ColumnBuilder] the column expression builder

• #validate!(value)

  Validate the value - @param value [DB::Any] The value to validate

Constructor Detail

column = Cql::Column.new(:name, String)

Instance Method Detail

column = Cql::Column.new(:name, String)
column.expression.eq("John")

column = Cql::Column.new(:name, String)
column.validate!("John")