Class: Enumeration

Inherits:
Sequel::Model
  • Object
show all
Defined in:
backend/app/model/enumeration.rb,
frontend/app/models/enumeration.rb

Constant Summary collapse

CSV_HEADERS = 
["Enumeration code", "Enumeration", "Value code", "Value", "Position", "Read-only"]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash = {}) ⇒ Enumeration

Returns a new instance of Enumeration.



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# File 'frontend/app/models/enumeration.rb', line 5

def initialize(hash = {})
  if hash
    @enum_name = hash["enum_name"]
    @enum_value = hash["enum_value"]
  end
end

Instance Attribute Details

#enum_name ⇒ Object

Returns the value of attribute enum_name



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# File 'frontend/app/models/enumeration.rb', line 2

def enum_name
  @enum_name
end

#enum_value ⇒ Object

Returns the value of attribute enum_value



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# File 'frontend/app/models/enumeration.rb', line 3

def enum_value
  @enum_value
end

Class Method Details

.apply_values(obj, json, opts = {}) ⇒ Object

Update the allowable values of the current enumeration.



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# File 'backend/app/model/enumeration.rb', line 81

def self.apply_values(obj, json, opts = {})
  # don't allow update of an non-editable enumeration
  # make sure the DB mapping has been converted.
  obj.reload
  is_editable = ( obj.editable === 1 or obj.editable == true )


  incoming_values = Array(json['values'])
  existing_values = obj.enumeration_value.select {|val| val[:suppressed] != 1 }.map {|val| val[:value] }
  # we need to keep suppressed values in mind for positioning
  existing_length = obj.enumeration_value.length

  added_values = incoming_values - existing_values
  removed_values = existing_values - incoming_values

  # if it's not editable, we cannot add or remove values, but we can set the
  # default...
  if (( !is_editable and added_values.length > 0 ) or ( !is_editable and removed_values.length > 0 )) and opts[:default_value].nil?
    raise AccessDeniedException.new("Cannot modify a non-editable enumeration: #{obj.name} with #{ json['values'].join(' , ') }. Only allowed values are : #{ obj.enumeration_value.join(' , ')} ")
  end

  # Make sure we're not being asked to remove read-only values.
  if EnumerationValue.filter(:enumeration_id => obj.id,
                             :value => removed_values,
                             :readonly => 1).count > 0

    raise AccessDeniedException.new("Can't remove read-only enumeration values")
  end


  added_values.each_with_index do |value, i|
    obj.add_enumeration_value(:value => value, :position => (existing_length + i + 1) )
  end

  removed_values.each do |value|
    DB.attempt {
      EnumerationValue.filter(:enumeration_id => obj.id,
                              :value => value, :suppressed => 0 ).delete
    }.and_if_constraint_fails {
      raise ConflictException.new("Can't delete a value that's in use: #{value}")
    }
  end


  enum_vals = EnumerationValue.filter( :enumeration_id => obj.id ).order(:position)
  enum_vals.update(:position => Sequel.lit('position + 9999' ))
  enum_vals.each_with_index do |ev, i|
    ev.position = i
    ev.save
  end

  broadcast_changes

  obj.refresh

  existing_default = obj.default_value.nil? ? nil : obj.default_value[:value]

  if opts[:default_value] != existing_default
    if opts[:default_value]
      new_default = EnumerationValue[:value => opts[:default_value]]
      return obj if new_default.nil? #just move along if the default isn't in the values table
      obj.default_value = new_default[:id]
    else
      obj.default_value = nil
    end

    obj.save
  end


  obj
end

.broadcast_changes ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 194

def self.broadcast_changes
  Notifications.notify("ENUMERATION_CHANGED")
end

.create_from_json(json, opts = {}) ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 155

def self.create_from_json(json, opts = {})
  default_value = json['default_value']
  json['default_value'] = nil

  self.apply_values(super, json, opts.merge({:default_value => default_value}))
end

.csv ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 199

def self.csv
  out = CSV_HEADERS.to_csv
  Enumeration.sequel_to_jsonmodel(Enumeration.all).sort_by { |e| e.name }.each do |enum|
    enum.enumeration_values.reject { |v| v.suppressed == 1 }.sort_by { |v| v.position }.each do |val|
      out << [
              enum.name,
              I18n.t("enumeration_names.#{enum.name}", :default => enum.name),
              val.value,
              I18n.t("enumerations.#{enum.name}.#{val.value}", :default => val.value),
              val.position,
              val.readonly,
             ].to_csv
    end
  end

  out
end

.dependants_of(enum_name) ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 25

def self.dependants_of(enum_name)
  @enumeration_dependants[enum_name]
end

.register_enumeration_dependant(definition, model) ⇒ Object

Record the fact that ‘model’ uses ‘enum_name’.



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# File 'backend/app/model/enumeration.rb', line 17

def self.register_enumeration_dependant(definition, model)
  Array(definition[:uses_enum]).each do |enum_name|
    @enumeration_dependants[enum_name] ||= []
    @enumeration_dependants[enum_name] << [definition, model]
  end
end

.sequel_to_jsonmodel(objs, opts = {}) ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 171

def self.sequel_to_jsonmodel(objs, opts = {})
  jsons = super

  jsons.zip(objs).each do |json, obj|

    # we're keeping the values as just the not suppressed values.
    # enumeration_values are only needed in situations where we are
    # editing/updating the lists.
    json['values'] = obj.enumeration_value.select {|v| v[:suppressed] != 1 }.map {|v| v[:value] }
    json['readonly_values'] = obj.enumeration_value.map {|v| v[:value] if ( v[:readonly] != 0 && v[:suppressed] != 1 )}.compact
    json['enumeration_values'] = EnumerationValue.sequel_to_jsonmodel(obj.enumeration_value)
    # this tells us where the enum is used.
    json["relationships"] = obj.dependants.collect { |d| d.first[:property] }.uniq

    if obj.default_value
      json['default_value'] = EnumerationValue[:id => obj.default_value][:value]
    end
  end

  jsons
end

Instance Method Details

#dependants ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 29

def dependants
  self.class.dependants_of(self.name) || []
end

#migrate(old_value, new_value) ⇒ Object

Find all database records that refer to the enumeration value identified by ‘source_id’ and repoint them to ‘destination_id’.



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# File 'backend/app/model/enumeration.rb', line 35

def migrate(old_value, new_value)
  is_editable = ( self.editable === 1 or self.editable == true )
  if !is_editable
    raise EnumerationMigrationFailed.new("Can't migrate values for non-editable enumeration #{self.id}")
  end

  old_enum_value = self.enumeration_value.find {|val| val[:value] == old_value}

  if old_enum_value.nil?
    raise NotFoundException.new("Can't find a value '#{old_value}' in enumeration #{self.id}")
  end

  if old_enum_value.readonly != 0
    raise EnumerationMigrationFailed.new("Can't transfer from a read-only enumeration value")
  end

  new_enum_value = self.enumeration_value.find {|val| val[:value] == new_value}

  if new_enum_value.nil?
    raise NotFoundException.new("Can't find a value '#{new_value}' in enumeration #{self.id}")
  end

  dependants = self.class.dependants_of(self.name) ? self.class.dependants_of(self.name) : []
  dependants.each do |definition, model|
    property_id = "#{definition[:property]}_id".intern
    records = model.filter(property_id => old_enum_value.id)
    if model.included_modules.include?(ActiveAssociation)
      # update and check each record for a related record to reindex
      records.each do |rec|
        rec.update(property_id => new_enum_value.id, :system_mtime => Time.now)
        rec.broadcast_reindex
      end
    else
      # update in one go
      records.update(property_id => new_enum_value.id, :system_mtime => Time.now)
    end
  end

  old_enum_value.delete
  self.reload
  self.enumeration_value.each_with_index { |ev, i| ev.position = i; ev.save }
  self.class.broadcast_changes
end

#update_from_json(json, opts = {}, apply_nested_records = true) ⇒ Object 



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# File 'backend/app/model/enumeration.rb', line 163

def update_from_json(json, opts = {}, apply_nested_records = true)
  default_value = json['default_value']
  json['default_value'] = nil

  self.class.apply_values(super, json, opts.merge({:default_value => default_value}))
end