Class: Dbsketch::Model::Index

Inherits:
Database_Object show all
Defined in:
lib/dbsketch/model/index.rb

Instance Attribute Summary collapse

Attributes inherited from Database_Object

#comment, #dependencies, #meaning, #name, #order

Instance Method Summary collapse

Methods inherited from Database_Object

#add_dependencies, #class_name, #compute_order!, #inspect, #reset_order!

Constructor Details

#initialize(name, target, columns, meaning: nil, comment: nil, dependencies: []) ⇒ Index

Returns a new instance of Index.

Raises:

  • (ArgumentError) 


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# File 'lib/dbsketch/model/index.rb', line 16

def initialize name, target, columns, meaning: nil, comment: nil, dependencies: []
	super name, :meaning => meaning, :comment => comment, :dependencies => dependencies
	@columns = columns.is_a?(Array) ? columns : [columns]
	### Preconditions
	raise ArgumentError, "target is not a Dbsketch::Model::Table or a View" unless target.is_a? Table or target.is_a? View
	@columns.each_with_index do |column, index|
		raise ArgumentError, "columns[#{index}] is not a Dbsketch::Model::AbstractColumn" unless column.is_a? AbstractColumn
		raise ModelError, "computed column #{column.name} is not persisted" if column.is_a? ComputedColumn and not column.persisted
	end
	###
	@target = target
end

Instance Attribute Details

#columns ⇒ Object (readonly)

Returns the value of attribute columns.



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# File 'lib/dbsketch/model/index.rb', line 29

def columns
  @columns
end

#target ⇒ Object (readonly)

Returns the value of attribute target.



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# File 'lib/dbsketch/model/index.rb', line 29

def target
  @target
end

Instance Method Details

#has_column?(column_name) ⇒ Boolean

Returns:

  • (Boolean)

Raises:

  • (ArgumentError) 


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# File 'lib/dbsketch/model/index.rb', line 31

def has_column? column_name
	### Preconditions
	raise ArgumentError, "column_name is not a String" unless column_name.is_a? String
	###
	nil != @columns.find { |c| c.name.downcase == column_name.downcase }
end