class RuboCop::Cop::Rails::FindBy
This cop is used to identify usages of `where.first` and change them to use `find_by` instead.
@example
# bad User.where(name: 'Bruce').first User.where(name: 'Bruce').take # good User.find_by(name: 'Bruce')
Constants
- MSG
- TARGET_SELECTORS
Public Instance Methods
autocorrect(node)
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# File lib/rubocop/cop/rails/find_by.rb, line 35 def autocorrect(node) receiver, second_method = where_first(node) # Don't autocorrect where(...).first, because it can return different # results from find_by. (They order records differently, so the # 'first' record can be different.) return if second_method == :first where_loc = receiver.loc.selector first_loc = Parser::Source::Range.new( node.source_range.source_buffer, node.loc.dot.begin_pos, node.loc.selector.end_pos ) lambda do |corrector| corrector.replace(where_loc, 'find_by') corrector.replace(first_loc, '') end end
on_send(node)
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# File lib/rubocop/cop/rails/find_by.rb, line 24 def on_send(node) return unless (recv_and_method = where_first(node)) receiver, second_method = *recv_and_method range = Parser::Source::Range.new(node.source_range.source_buffer, receiver.loc.selector.begin_pos, node.loc.selector.end_pos) add_offense(node, range, format(MSG, second_method)) end