Question

I’m new to ruby on rails (and ruby) and I’m trying to get ActiveAdmin working with my model. I’ve got a lot of the simple stuff working, but ActiveAdmin (on ActiveRecord) is giving me the following error and I cannot figure out why (I’m sure I’ve misconfigured something, but I don’t know what):

Mysql2::Error: Unknown column ‘assessment_styles.assessment_definition_id’ in ‘where clause’: SELECT assessment_styles.* FROM assessment_styles WHERE assessment_styles.assessment_definition_id = 1 LIMIT 1

The AssessmentDefinition Model

class AssessmentDefinition < ActiveRecord::Base
  attr_accessible :active, :endDOW, :endDate, :isForResearch, :name, :startDOW, :startDa>
  has_one :assessmentStyle, :inverse_of => :assessment_definitions
  has_one :consentForm

  validates :name, :endDOW, :startDOW, :endDate, :startDate, :presence => true

  has_and_belongs_to_many :courses
  has_and_belongs_to_many :groups
  has_and_belongs_to_many :behaviours

end

The AssessmentStyle Model

class AssessmentStyle < ActiveRecord::Base
  attr_accessible :name
  has_many :assessment_definitions, :inverse_of => :assessmentStyle
end

What am I doing wrong?

Answer 1

Oops! I figured it out (with a little help from Duane’s Brain). I was misunderstanding has_one vs. belongs_to, having confused it with the plain English sense of the word and not having realised what it was doing under the hood.