Class: Patterns::Query
- Inherits:
-
Object
- Object
- Patterns::Query
- Defined in:
- lib/patterns/query.rb
Constant Summary collapse
- RelationRequired =
Class.new(StandardError)
Class Attribute Summary collapse
-
.base_relation ⇒ Object
Returns the value of attribute base_relation.
Class Method Summary collapse
Instance Method Summary collapse
- #base_relation ⇒ Object
- #call ⇒ Object
-
#initialize(*args) ⇒ Query
constructor
A new instance of Query.
Constructor Details
#initialize(*args) ⇒ Query
Returns a new instance of Query.
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 |
# File 'lib/patterns/query.rb', line 7 def initialize(*args) @options = args. @relation = args.first || base_relation if relation.nil? raise( RelationRequired, "Queries require a base relation defined. Use .queries method to define relation." ) elsif !relation.is_a?(ActiveRecord::Relation) raise( RelationRequired, "Queries accept only ActiveRecord::Relation as input" ) end end |
Class Attribute Details
.base_relation ⇒ Object
Returns the value of attribute base_relation.
56 57 58 |
# File 'lib/patterns/query.rb', line 56 def base_relation @base_relation end |
Class Method Details
.call(*args) ⇒ Object
24 25 26 |
# File 'lib/patterns/query.rb', line 24 def self.call(*args) new(*args).call end |
.queries(subject) ⇒ Object
39 40 41 |
# File 'lib/patterns/query.rb', line 39 def self.queries(subject) self.base_relation = subject end |
Instance Method Details
#base_relation ⇒ Object
43 44 45 46 47 48 49 50 51 |
# File 'lib/patterns/query.rb', line 43 def base_relation return nil if self.class.base_relation.nil? if self.class.base_relation.is_a?(ActiveRecord::Relation) self.class.base_relation elsif self.class.base_relation < ActiveRecord::Base self.class.base_relation.all end end |
#call ⇒ Object
28 29 30 31 32 33 34 35 36 37 |
# File 'lib/patterns/query.rb', line 28 def call query.tap do |relation| unless relation.is_a?(ActiveRecord::Relation) raise( RelationRequired, "#query method should return object of ActiveRecord::Relation class" ) end end end |