rails has_many through undefined method `body' for - ruby-on-rails

Question

I have models
class Riskfactor < ActiveRecord::Base
has_many :bodies_riskfactors
has_many :bodies, through: :bodies_riskfactors
end
class Body < ActiveRecord::Base
has_many :bodies_riskfactors
has_many :riskfactors, through: :bodies_riskfactors
end
class DisordersArticle < ActiveRecord::Base
belongs_to :disorder
belongs_to :article
end
in view
= form_for [:admin, #riskfactor], html: {role: "form"} do |f|
= f.select :body_ids, Body.all.collect {|x| [x.name, x.id]}, {}, :multiple => true
and I have error on update
What could be wrong?
Processing by Admin::RiskfactorsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"CVkdBHLzLAeQ8FRFBVyonUuyn1FZAYG+X9fX/mmj+Bo=", "riskfactor"=>{"body_ids"=>["", "1"], "position"=>"1", "slug"=>"risk-factor-2", "name_ru"=>"High Blood Pressure", "published_ru"=>"no", "content_ru"=>"", "meta_description_ru"=>"", "meta_keywords_ru"=>"", "name_en"=>"High Blood Pressure", "published_en"=>"no", "content_en"=>"High Blood Pressure High Blood Pressure High Blood Pressure High Blood Pressure High Blood Pressure", "meta_description_en"=>"", "meta_keywords_en"=>""}, "button"=>"", "id"=>"4"}
User Load (0.3ms) SELECT users.* FROM users WHERE users.id = 1 ORDER BY users.id ASC LIMIT 1
Riskfactor Load (0.3ms) SELECT riskfactors.* FROM riskfactors WHERE riskfactors.id = 4 LIMIT 1
(0.1ms) BEGIN
Body Load (0.3ms) SELECT bodies.* FROM bodies WHERE bodies.id = 1 ORDER BY position LIMIT 1
Body Load (2.6ms) SELECT bodies.* FROM bodies INNER JOIN bodies_riskfactors ON bodies.id = bodies_riskfactors.body_id WHERE bodies_riskfactors.riskfactor_id = 4 ORDER BY position
Riskfactor::Translation Load (0.3ms) SELECT riskfactor_translations.* FROM riskfactor_translations WHERE riskfactor_translations.riskfactor_id = 4
Riskfactor Exists (0.6ms) SELECT 1 AS one FROM riskfactors WHERE (riskfactors.slug = 'risk-factor-2' AND riskfactors.id != 4) LIMIT 1
(0.2ms) ROLLBACK
Completed 500 Internal Server Error in 15ms
NoMethodError (undefined method body' for #<Riskfactor:0x007f9a0351c350>):
app/controllers/admin/riskfactors_controller.rb:45:inblock in update'
app/controllers/admin/riskfactors_controller.rb:44:in `update'
RiskfactorsController
class Admin::RiskfactorsController < Admin::BaseController
before_action :set_riskfactor, only: [:show, :edit, :update, :destroy]
def update
respond_to do |format|
if #riskfactor.update(riskfactor_params)
format.html { redirect_to [:edit, :admin, #riskfactor], notice: 'Riskfactor was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #riskfactor.errors, status: :unprocessable_entity }
end
end
end
private
def set_riskfactor
#riskfactor = Riskfactor.find(params[:id])
end
def riskfactor_params
params.require(:riskfactor).permit!
end
end

Answer 1

Imho the problem is that you have body_ids in your view, but you named you association as bodies. Try to rename body_ids to bodies_ids or something like that.