Class: AzaharaSchema::AssociationAttribute

Inherits:
Attribute
  • Object
show all
Defined in:
lib/azahara_schema/association_attribute.rb

Overview

The class is attribute for associated record, it is used for working with related records.

TODO: better way of joining the association - mandatory as joins others as left outer, but not includes.

The class holds schema for related entity.

Instance Attribute Summary collapse

Attributes inherited from Attribute

#format, #model, #name, #table_alias

Instance Method Summary collapse

Methods inherited from Attribute

#aggregable?, #arel_sort_field, #arel_table, #attribute_name, #available_operators, #filter?, #filter_name, #type

Constructor Details

#initialize(model, association_schema, attribute) ⇒ AssociationAttribute

Returns a new instance of AssociationAttribute.



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# File 'lib/azahara_schema/association_attribute.rb', line 19

def initialize(model, association_schema, attribute)
  @schema = association_schema
  @attribute = attribute
  super(model, association.name.to_s+'-'+attribute.name, attribute.type)
end

Instance Attribute Details

#attribute ⇒ Object (readonly)

Returns the value of attribute attribute.



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# File 'lib/azahara_schema/association_attribute.rb', line 15

def attribute
  @attribute
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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# File 'lib/azahara_schema/association_attribute.rb', line 15

def schema
  @schema
end

Instance Method Details

#add_join(scope) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 85

def add_join(scope)
  # scope.left_outer_joins(association_hash)
  scope.joins(arel_join.join_sources)
end

#add_preload(scope) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 90

def add_preload(scope)
  scope.preload(association_hash)
end

#add_sort(scope, order) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 99

def add_sort(scope, order)
  super(add_join(scope), order)
end

#add_statement(scope, operator, values) ⇒ Object

TODO: heuristic for when add left outer join and when add inner join



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# File 'lib/azahara_schema/association_attribute.rb', line 95

def add_statement(scope, operator, values)
  super(add_join(scope), operator, values)
end

#arel_field ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 34

def arel_field
  attribute.arel_field
end

#arel_join(parent = nil, join_type = ::Arel::Nodes::OuterJoin, a_tbl = self.arel_table) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 67

def arel_join(parent=nil, join_type=::Arel::Nodes::OuterJoin, a_tbl=self.arel_table)
  parent ||= self.arel_table(nil)
  joined = parent
  case association.macro
  when :has_many, :has_one
    joined = parent.join(attribute.arel_table, join_type).on( attribute.arel_table[association.foreign_key].eq( a_tbl[model.primary_key] ) )
  when :belongs_to
    joined = parent.join(attribute.arel_table, join_type).on( attribute.arel_table[attribute.model.primary_key].eq( a_tbl[association.foreign_key] ) )
  else
    raise 'Unknown macro ' + association.macro.to_s
  end
  attribute.arel_join( joined, join_type )
end

#arel_statement(operator, values) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 81

def arel_statement(operator, values)
  attribute.arel_statement(operator, values)
end

#association_hash ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 63

def association_hash
  { association.name => attribute.association_hash }
end

#available_values ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 30

def available_values
  attribute.available_values
end

#base_schema ⇒ Object

Goes to the last level, for attribute base schema



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# File 'lib/azahara_schema/association_attribute.rb', line 26

def base_schema
  attribute.try(:schema) || schema
end

#build_json_options!(options) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 103

def build_json_options!(options)
  options[:include] ||= {}
  options[:include][association.name.to_sym] ||= {}
  attribute.build_json_options!(options[:include][association.name.to_sym])
  options
end

#column? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/azahara_schema/association_attribute.rb', line 46

def column?
  association.macro == :belongs_to && attribute.column?
end

#path ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 42

def path
  association.name.to_s+'.'+attribute.path
end

#primary_key_name ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 38

def primary_key_name
  association.name.to_s+'-'+attribute.primary_key_name
end

#searchable? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/azahara_schema/association_attribute.rb', line 50

def searchable?
  false
end

#value(parent) ⇒ Object 



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# File 'lib/azahara_schema/association_attribute.rb', line 54

def value(parent)
  if association.macro == :has_many
    parent.public_send(association.name).collect{|record| attribute.value( record )}.flatten
  else
    entity = parent.public_send(association.name)
    attribute.value( entity ) if entity
  end
end