Class: ActiveRecord::Associations::JoinDependency::JoinAssociation
- Inherits:
-
JoinPart
- Object
- JoinPart
- ActiveRecord::Associations::JoinDependency::JoinAssociation
- Defined in:
- lib/active_record/associations/join_dependency/join_association.rb
Overview
:nodoc:
Instance Attribute Summary collapse
-
#reflection ⇒ Object
readonly
Returns the value of attribute reflection.
-
#table ⇒ Object
Returns the value of attribute table.
-
#tables ⇒ Object
Returns the value of attribute tables.
Attributes inherited from JoinPart
Instance Method Summary collapse
-
#initialize(reflection, children) ⇒ JoinAssociation
constructor
A new instance of JoinAssociation.
- #join_constraints(foreign_table, foreign_klass, join_type, alias_tracker) ⇒ Object
- #match?(other) ⇒ Boolean
Methods inherited from JoinPart
#each, #each_children, #extract_record, #instantiate
Constructor Details
#initialize(reflection, children) ⇒ JoinAssociation
Returns a new instance of JoinAssociation.
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 12 def initialize(reflection, children) super(reflection.klass, children) @reflection = reflection @tables = nil end |
Instance Attribute Details
#reflection ⇒ Object (readonly)
Returns the value of attribute reflection.
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 9 def reflection @reflection end |
#table ⇒ Object
Returns the value of attribute table.
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 10 def table @table end |
#tables ⇒ Object
Returns the value of attribute tables.
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 9 def tables @tables end |
Instance Method Details
#join_constraints(foreign_table, foreign_klass, join_type, alias_tracker) ⇒ Object
[View source]
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 24 def join_constraints(foreign_table, foreign_klass, join_type, alias_tracker) joins = [] # The chain starts with the target table, but we want to end with it here (makes # more sense in this context), so we reverse reflection.chain.reverse_each.with_index(1) do |reflection, i| table = tables[-i] klass = reflection.klass join_scope = reflection.join_scope(table, foreign_table, foreign_klass) arel = join_scope.arel(alias_tracker.aliases) nodes = arel.constraints.first others, children = nodes.children.partition do |node| !fetch_arel_attribute(node) { |attr| attr.relation.name == table.name } end nodes = table.create_and(children) joins << table.create_join(table, table.create_on(nodes), join_type) unless others.empty? joins.concat arel.join_sources append_constraints(joins.last, others) end # The current table in this iteration becomes the foreign table in the next foreign_table, foreign_klass = table, klass end joins end |
#match?(other) ⇒ Boolean
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# File 'lib/active_record/associations/join_dependency/join_association.rb', line 19 def match?(other) return true if self == other super && reflection == other.reflection end |