Class: AdminData::ActiveRecordUtil

Inherits:
Object
  • Object
show all
Defined in:
lib/admin_data/active_record_util.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass) ⇒ ActiveRecordUtil

Returns a new instance of ActiveRecordUtil.



6
7
8
 
# File 'lib/admin_data/active_record_util.rb', line 6

def initialize(klass)
  @klass = klass
end

Instance Attribute Details

#klass ⇒ Object

Returns the value of attribute klass.



4
5
6
 
# File 'lib/admin_data/active_record_util.rb', line 4

def klass
  @klass
end

Instance Method Details

#declared_belongs_to_association_names ⇒ Object

class User

belongs_to :club

end

ActiveRecordUtil.new(User).declared_belongs_to_association_names #=> [‘club’]



26
27
28
 
# File 'lib/admin_data/active_record_util.rb', line 26

def declared_belongs_to_association_names
  delcared_association_names_for(:belongs_to).map(&:name).map(&:to_s)
end

#declared_habtm_association_names ⇒ Object

class User

has_and_belongs_to_many :clubs

end

ActiveRecordUtil.new(User).declared_habtm_association_names #=> [‘clubs’]



16
17
18
 
# File 'lib/admin_data/active_record_util.rb', line 16

def declared_habtm_association_names
  delcared_association_names_for(:has_and_belongs_to_many).map(&:name).map(&:to_s)
end

#declared_has_many_association_names ⇒ Object

class User

has_many :cars

end

ActiveRecordUtil.new(User).declared_has_many_association_names #=> [‘cars’]



46
47
48
 
# File 'lib/admin_data/active_record_util.rb', line 46

def declared_has_many_association_names
  delcared_association_names_for(:has_many).map(&:name).map(&:to_s)
end

#declared_has_one_association_names ⇒ Object

class User

has_one :car

end

ActiveRecordUtil.new(User).declared_has_one_association_names #=> [‘car’]



36
37
38
 
# File 'lib/admin_data/active_record_util.rb', line 36

def declared_has_one_association_names
  delcared_association_names_for(:has_one).map(&:name).map(&:to_s)
end

#habtm_klasses_for ⇒ Object

returns an array of classes

class User

has_and_belongs_to_many :clubs

end

ActiveRecordUtil.new(User).habtm_klasses_for #=> [Club]



58
59
60
61
62
 
# File 'lib/admin_data/active_record_util.rb', line 58

def habtm_klasses_for
  declared_habtm_association_names.map do |assoc_name|
    klass_for_association_type_and_name(:has_and_belongs_to_many, assoc_name)
  end
end

#has_association_info? ⇒ Boolean

returns false if the given Klass has no association info. Otherwise returns true.

Returns:

  • (Boolean) 


81
82
83
84
85
86
 
# File 'lib/admin_data/active_record_util.rb', line 81

def has_association_info?
  declared_belongs_to_association_names.any? ||
  declared_has_many_association_names.any? ||
  declared_has_many_association_names.any? ||
  declared_habtm_association_names.any?
end

#klass_for_association_type_and_name(association_type, association_name) ⇒ Object

returns a class or nil

class User

has_many :comments

end

ActiveRecordUtil.new(User).klass_for_association_type_and_name(:has_many, ‘comments’) #=> Comment



73
74
75
76
77
78
 
# File 'lib/admin_data/active_record_util.rb', line 73

def klass_for_association_type_and_name(association_type, association_name)
  data = klass.name.camelize.constantize.reflections.values.detect do |value|
    value.macro == association_type && value.name.to_s == association_name
  end
  data.klass if data # output of detect from hash is an array with key and value
end