Class: ROM::SQL::RestrictionDSL Private

Inherits:
DSL
  • Object
show all
Defined in:
lib/rom/sql/restriction_dsl.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Instance Attribute Summary

Attributes inherited from DSL

#relations, #schema

Instance Method Summary collapse

Methods inherited from DSL

#`, #initialize, #respond_to_missing?

Constructor Details

This class inherits a constructor from ROM::SQL::DSL

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth, *args, &block) ⇒ Object (private)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/sql/restriction_dsl.rb', line 23

def method_missing(meth, *args, &block)
  if schema.key?(meth)
    schema[meth]
  else
    type = type(meth)

    if type
      ::ROM::SQL::Function.new(type)
    else
      ::Sequel::VIRTUAL_ROW.__send__(meth, *args, &block)
    end
  end
end

Instance Method Details

#call(&block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/rom/sql/restriction_dsl.rb', line 8

def call(&block)
  instance_exec(relations, &block)
end

#exists(relation) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a result of SQL EXISTS clause.

Examples:

users.where { exists(users.where(name: 'John')) }


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# File 'lib/rom/sql/restriction_dsl.rb', line 16

def exists(relation)
  ::ROM::SQL::Attribute[Types::Bool].meta(sql_expr: relation.dataset.exists)
end