Ruby on Rails - why i am facing possible unmatched constraints[:exercise_id] - ruby-on-rails

Question

def edit
#exercise = Exercise.find(params[:exercise_id])
#play = #exercise.plays.find(params[:id])
end
def update
#exercise = Exercise.find(params[:exercise_id])
#play = #exercise.plays.find(params[:id])
if #exercise.plays.update_attributes(play_params)
redirect_to #exercise_path
else
render action: :edit
end
end
partial view that is being rendered to show all created plays has
<p><%= play.name %></p>
<p><%= play.sets %></p>
<p><%= play.reps %></p>
<%= link_to "edit", edit_exercise_play_path( #exercise, play) %>
that is plays_controller :edit, :update method, Actually i have two classes, one is ExerciseController and other one is PlaysController, ExerciseController has_many plays, i am rendering two partials one to create play and other one to show that play on same page on the partial which is rendering the play after creation, but now i want to add edit feature with edit_exercise_play_path,
<%= link_to "Edit", edit_exercise_play_path(#play) %>
after this i am facing unmatched constraint error.Thanks
resources :exercises do
resources :plays
end
Show.html.erb from ExercisesController
<h2>Your Workout Details </h2>
<p><%= #exercise.workout %></p>
<p><%= #exercise.mode %></p>
<p><%= #exercise.date.strftime("on %A at %H:%M Dated as %d %B") %></p>
<p><%= #exercise.length %></p><br />
<h3> Games you Played </h3>
<%= render #exercise.plays %>
<h3>Add new Game </h3>
<%= render 'plays/form' %>
<%= link_to "Edit", edit_exercise_path %> | |
<%= link_to "Destroy", exercise_path(#exercise), :confirm => "Are you
sure?", :method => :delete %> | |
<%= link_to "Back", root_path %>
" Logs "
Started GET "/exercises/5" for 127.0.0.1 at 2018-09-25 18:12:21 +0500
Processing by ExercisesController#show as HTML
Parameters: {"id"=>"5"}
Exercise Load (0.0ms) SELECT "exercises".* FROM "exercises" WHERE "exercises"."id" = ? LIMIT ? [["id", 5], ["LIMIT", 1]]
Rendering exercises/show.html.erb
Play Load (0.0ms) SELECT "plays".* FROM "plays" WHERE "plays"."exercise_id" = ? [["exercise_id", 5]]
Rendered collection of plays/_play.html.erb [6 times] (14.0ms)
Rendered exercises/show.html.erb (39.7ms)
Completed 500 Internal Server Error in 136ms (ActiveRecord: 0.0ms)

Answer 1

As per your routes, the path helper edit_exercise_play_path also require value for :exercise_id key. But you haven't passing any. Changing the link_to to below should fix your problem
<%= link_to "Edit", edit_exercise_play_path(#exercise, #play) %>
Update:
As per our discussion over the chat, the link_to edit should look like below
<%= link_to "Edit", edit_exercise_play_path(#exercise, play) %>
as you are rendering a partial with <%= render #exercise.plays %> which creates a play variable.
undefined method `model_name' for nil:NilClass
For this, you should change <%= render 'form' %> to <%= render 'form' , exercise: #exercise, play: #play %> and in the _form.html.erb change the first line of the form to <%= simple_form_for ([exercise, play]) do |f| %>
undefined method `update_attributes' for
Play::ActiveRecord_Associations_CollectionProxy:0x0000000f69c710
The reason for this error is in your update method you have have #exercise.plays.update_attributes(play_params). This means you are calling update_attributes on collection. You should change
if #exercise.plays.update_attributes(play_params)
to
if #play.update_attributes(play_params)