Class: ActiveScaffold::DataStructures::Columns
- Includes:
- Configurable, Enumerable
- Defined in:
- lib/active_scaffold/data_structures/columns.rb
Instance Attribute Summary collapse
-
#active_record_class ⇒ Object
readonly
This accessor is used by ActionColumns to create new Column objects without adding them to this set.
Instance Method Summary collapse
- #_inheritable ⇒ Object
-
#_inheritable=(value) ⇒ Object
The motivation for this collection is that this Columns data structure fills two roles: it provides the master list of all known columns, and it provides an inheritable list for all other actions (e.g. Create and Update and List).
-
#add(*args) ⇒ Object
(also: #<<)
the way to add columns to the set.
- #each ⇒ Object
- #exclude(*args) ⇒ Object
-
#find_by_name(name) ⇒ Object
(also: #[])
returns the column of the given name.
-
#find_by_names(*names) ⇒ Object
returns an array of columns with the provided names.
-
#initialize(active_record_class, *args) ⇒ Columns
constructor
A new instance of Columns.
Methods included from Configurable
Constructor Details
#initialize(active_record_class, *args) ⇒ Columns
Returns a new instance of Columns.
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# File 'lib/active_scaffold/data_structures/columns.rb', line 22 def initialize(active_record_class, *args) @active_record_class = active_record_class @_inheritable = [] @set = [] self.add *args end |
Dynamic Method Handling
This class handles dynamic methods through the method_missing method in the class ActiveScaffold::Configurable
Instance Attribute Details
#active_record_class ⇒ Object (readonly)
This accessor is used by ActionColumns to create new Column objects without adding them to this set
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# File 'lib/active_scaffold/data_structures/columns.rb', line 20 def active_record_class @active_record_class end |
Instance Method Details
#_inheritable ⇒ Object
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# File 'lib/active_scaffold/data_structures/columns.rb', line 65 def _inheritable if @sorted @_inheritable else @_inheritable.sort do |a, b| self[a] <=> self[b] end end end |
#_inheritable=(value) ⇒ Object
The motivation for this collection is that this Columns data structure fills two roles: it provides the master list of all known columns, and it provides an inheritable list for all other actions (e.g. Create and Update and List). Well we actually want to know about as many columns as possible, so we don’t want people actually removing columns from @set. But at the same time, we want to be able to manage which columns get inherited. Tada!
This collection is referenced by other parts of ActiveScaffold and by methods within this DataStructure. IT IS NOT MEANT FOR PUBLIC USE (but if you know what you’re doing, go ahead)
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# File 'lib/active_scaffold/data_structures/columns.rb', line 14 def _inheritable=(value) @sorted = true @_inheritable = value end |
#add(*args) ⇒ Object Also known as: <<
the way to add columns to the set. this is primarily useful for virtual columns. note that this also makes columns inheritable
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# File 'lib/active_scaffold/data_structures/columns.rb', line 32 def add(*args) args.flatten! # allow [] as a param args = args.collect{ |a| a.to_sym } # make the columns inheritable @_inheritable.concat(args) # then add columns to @set (unless they already exist) args.each { |a| @set << ActiveScaffold::DataStructures::Column.new(a.to_sym, @active_record_class) unless find_by_name(a) } end |
#each ⇒ Object
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# File 'lib/active_scaffold/data_structures/columns.rb', line 61 def each @set.each {|i| yield i } end |
#exclude(*args) ⇒ Object
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# File 'lib/active_scaffold/data_structures/columns.rb', line 43 def exclude(*args) # only remove columns from _inheritable. we never want to completely forget about a column. args.each { |a| @_inheritable.delete a } end |
#find_by_name(name) ⇒ Object Also known as: []
returns the column of the given name.
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# File 'lib/active_scaffold/data_structures/columns.rb', line 54 def find_by_name(name) # this works because of `def column.==' column = @set.find { |c| c == name } column end |
#find_by_names(*names) ⇒ Object
returns an array of columns with the provided names
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# File 'lib/active_scaffold/data_structures/columns.rb', line 49 def find_by_names(*names) @set.find_all { |column| names.include? column.name } end |