method

build_constraint

v4.2.1 - Show latest stable - 0 notes - Class: JoinAssociation

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What's this?

build_constraint(klass, table, key, foreign_table, foreign_key) public

Builds equality condition.

Example:

has_many :appointments

end

If I execute `Physician.joins(:appointments).to_a` then

klass         # => Physician
table         # => #<Arel::Table @name="appointments" ...>
key           # =>  physician_id
foreign_table # => #<Arel::Table @name="physicians" ...>
foreign_key   # => id

Show source

# File activerecord/lib/active_record/associations/join_dependency/join_association.rb, line 99
        def build_constraint(klass, table, key, foreign_table, foreign_key)
          constraint = table[key].eq(foreign_table[foreign_key])

          if klass.finder_needs_type_condition?
            constraint = table.create_and([
              constraint,
              klass.send(:type_condition, table)
            ])
          end

          constraint
        end

build_constraint

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