Class: ActiveScaffold::DataStructures::Sorting

Inherits:
Object
  • Object
show all
Includes:
OrmChecks, Enumerable
Defined in:
lib/active_scaffold/data_structures/sorting.rb

Overview

encapsulates the column sorting configuration for the List view

Constant Summary collapse

SORTING_STAGES = 
Hash[%w[reset ASC DESC reset].each_cons(2).to_a].freeze
DEFAULT_SORTING_STAGES = 
Hash[%w[ASC DESC ASC].each_cons(2).to_a].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from OrmChecks

active_record?, #cast, cast, column_type, columns, columns_hash, content_columns, default_value, mongoid?, quoted_table_name, reflect_on_all_associations, table_name, tableless?, type_for_attribute

Constructor Details

#initialize(columns, model) ⇒ Sorting

Returns a new instance of Sorting.



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 12

def initialize(columns, model)
  @columns = columns
  @clauses = []
  @constraint_columns = []
  @model = model
  @sorting_by_primary_key = false
end

Instance Attribute Details

#constraint_columns ⇒ Object

Returns the value of attribute constraint_columns.



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 7

def constraint_columns
  @constraint_columns
end

#model ⇒ Object (readonly) Also known as: active_record_class

Returns the value of attribute model.



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 9

def model
  @model
end

#sorting_by_primary_key ⇒ Object

enabled by default for postgres



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 8

def sorting_by_primary_key
  @sorting_by_primary_key
end

Instance Method Details

#<<(arg) ⇒ Object

an alias for add. must accept its arguments in a slightly different form, though.



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 49

def <<(arg)
  add(*arg)
end

#add(column_name, direction = nil) ⇒ Object

add a clause to the sorting, assuming the column is sortable

Raises:

  • (ArgumentError) 


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# File 'lib/active_scaffold/data_structures/sorting.rb', line 38

def add(column_name, direction = nil)
  direction ||= 'ASC'
  direction = direction.to_s.upcase
  column = get_column(column_name)
  raise ArgumentError, "Could not find column #{column_name}" if column.nil?
  raise ArgumentError, 'Sorting direction unknown' unless %i[ASC DESC].include? direction.to_sym
  @clauses << [column, direction] if column.sortable?
  raise ArgumentError, "Can't mix :method- and :sql-based sorting" if mixed_sorting?
end

#clause(grouped_columns = nil) ⇒ Object

builds an order-by clause



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 124

def clause(grouped_columns = nil)
  return nil if sorts_by_method? || default_sorting?

  # unless the sorting is by method, create the sql string
  order = []
  each do |sort_column, sort_direction|
    next if constraint_columns.include? sort_column.name
    sql = grouped_columns ? grouped_columns[sort_column.name] : sort_column.sort[:sql]
    next if sql.blank?
    sql = sql.to_sql if sql.respond_to?(:to_sql)

    parts = Array(sql).map do |column|
      mongoid? ? [column, sort_direction] : "#{column} #{sort_direction}"
    end
    order << parts
  end

  order << @primary_key_order_clause if @sorting_by_primary_key && grouped_columns.nil?
  order.flatten!(1)
  order unless order.empty?
end

#clear ⇒ Object

clears the sorting



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 73

def clear
  @default_sorting = false
  @clauses = []
end

#direction_of(column) ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 83

def direction_of(column)
  clause = get_clause(column)
  return if clause.nil?
  clause[1]
end

#each ⇒ Object

iterate over the clauses



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 106

def each
  @clauses.each { |clause| yield clause }
end

#each_column ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 110

def each_column
  @clauses.each { |clause| yield clause[0] }
end

#first ⇒ Object

provides quick access to the first (and sometimes only) clause



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 115

def first
  @clauses.first
end

#next_sorting_of(column, sorted_by_default) ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 91

def next_sorting_of(column, sorted_by_default)
  stages = sorted_by_default ? DEFAULT_SORTING_STAGES : SORTING_STAGES
  stages[direction_of(column)] || 'ASC'
end

#set(*args) ⇒ Object

clears the sorting before setting to the given column/direction set(column, direction) set(=> direction, column => direction) set(=> direction, => direction) set([column, direction], [column, direction])



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 58

def set(*args)
  # TODO: add deprecation unless args.size == 1 && args[0].is_a? Hash
  # when deprecation is removed:
  # * change list#sorting= to sorting.set(val)
  clear
  if args.first.is_a?(Enumerable)
    args.each do |h|
      h.is_a?(Hash) ? h.each { |c, d| add(c, d) } : add(*h)
    end
  else
    add(*args)
  end
end

#set_default_sorting ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 20

def set_default_sorting
  return unless active_record?
  # fallback to setting primary key ordering
  setup_primary_key_order_clause
  model_scope = model.send(:build_default_scope)
  order_clause = model_scope.order_values.join(',') if model_scope
  return unless order_clause
  # If an ORDER BY clause is found set default sorting according to it
  set_sorting_from_order_clause(order_clause, model.table_name)
  @default_sorting = true
end

#set_nested_sorting(table_name, order_clause) ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 32

def set_nested_sorting(table_name, order_clause)
  clear
  set_sorting_from_order_clause(order_clause, table_name)
end

#size ⇒ Object 



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# File 'lib/active_scaffold/data_structures/sorting.rb', line 119

def size
  @clauses.size
end

#sorts_by_method? ⇒ Boolean

checks whether any column is configured to sort by method (using a proc)

Returns:

  • (Boolean) 


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# File 'lib/active_scaffold/data_structures/sorting.rb', line 97

def sorts_by_method?
  @clauses.any? { |sorting| sorting[0].sort.is_a?(Hash) && sorting[0].sort.key?(:method) }
end

#sorts_by_sql? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_scaffold/data_structures/sorting.rb', line 101

def sorts_by_sql?
  @clauses.any? { |sorting| sorting[0].sort.is_a?(Hash) && sorting[0].sort.key?(:sql) }
end

#sorts_on?(column) ⇒ Boolean

checks whether the given column (a Column object or a column name) is in the sorting

Returns:

  • (Boolean) 


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# File 'lib/active_scaffold/data_structures/sorting.rb', line 79

def sorts_on?(column)
  !get_clause(column).nil?
end