Class: ROM::SQL::DSL Private

Inherits:
BasicObject
Defined in:
lib/rom/sql/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.

Direct Known Subclasses

GroupDSL, OrderDSL, ProjectionDSL, RestrictionDSL

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema) ⇒ DSL

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 new instance of DSL.


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# File 'lib/rom/sql/dsl.rb', line 24

def initialize(schema)
  @schema = schema
  @relations = schema.respond_to?(:relations) ? schema.relations : EMPTY_HASH
  @picked_relations = ::Concurrent::Map.new
end

Instance Attribute Details

#picked_relationsObject (readonly)

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/dsl.rb', line 21

def picked_relations
  @picked_relations
end

#relationsObject (readonly)

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/dsl.rb', line 17

def relations
  @relations
end

#schemaObject (readonly)

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/dsl.rb', line 13

def schema
  @schema
end

Instance Method Details

#`(value) ⇒ Sequel::LiteralString

Return a string literal that will be used directly in an ORDER clause

Parameters:

  • value (String)

Returns:

  • (Sequel::LiteralString)

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# File 'lib/rom/sql/dsl.rb', line 54

def `(value)
  ::Sequel.lit(value)
end

#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/dsl.rb', line 31

def call(&block)
  arg, kwargs = select_relations(block.parameters)

  if kwargs.nil?
    result = instance_exec(arg, &block)
  else
    result = instance_exec(**kwargs, &block)
  end

  if result.is_a?(::Array)
    result
  else
    [result]
  end
end

#exists(relation) ⇒ Object

Returns a result of SQL EXISTS clause.

Examples:

users.where { exists(users.where(name: 'John')) }
users.select_append { |r| exists(r[:posts].where(r[:posts][:user_id] => id)).as(:has_posts) }

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# File 'lib/rom/sql/dsl.rb', line 65

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

#respond_to_missing?(name, include_private = false) ⇒ Boolean

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:

  • (Boolean)

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# File 'lib/rom/sql/dsl.rb', line 70

def respond_to_missing?(name, include_private = false)
  super || schema.key?(name)
end