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module ActiveRecord
# :stopdoc:
module ConnectionAdapters
# An abstract definition of a column in a table.
class Column
attr_reader :name, :default, :sql_type_metadata, :null, :table_name, :default_function, :collation, :comment
delegate :precision, :scale, :limit, :type, :sql_type, to: :sql_type_metadata, allow_nil: true
# Instantiates a new column in the table.
#
# +name+ is the column's name, such as <tt>supplier_id</tt> in <tt>supplier_id int</tt>.
# +default+ is the type-casted default value, such as +new+ in <tt>sales_stage varchar(20) default 'new'</tt>.
# +sql_type_metadata+ is various information about the type of the column
# +null+ determines if this column allows +NULL+ values.
def initialize(name, default, sql_type_metadata = nil, null = true, table_name = nil, default_function = nil, collation = nil, comment: nil)
@name = name.freeze
@table_name = table_name
@sql_type_metadata = sql_type_metadata
@null = null
@default = default
@default_function = default_function
@collation = collation
@comment = comment
end
def has_default?
!default.nil? || default_function
end
def bigint?
/\Abigint\b/ === sql_type
end
# Returns the human name of the column name.
#
# ===== Examples
# Column.new('sales_stage', ...).human_name # => 'Sales stage'
def human_name
Base.human_attribute_name(@name)
end
def ==(other)
other.is_a?(Column) &&
attributes_for_hash == other.attributes_for_hash
end
alias :eql? :==
def hash
attributes_for_hash.hash
end
protected
def attributes_for_hash
[self.class, name, default, sql_type_metadata, null, table_name, default_function, collation]
end
end
class NullColumn < Column
def initialize(name)
super(name, nil)
end
end
end
# :startdoc:
end
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