Storing Carrierwave as json into an existing jsonb column - ruby-on-rails

Question

I'm not sure if this is even possible using Carrierwave, I'm still learning my way around Ruby and Rails so bear with me.
I have a simple form to record observations. Each observation has data that can be recorded against it and I store this in a JSONB column within the observation (I will eventually store multiple sets of data against an observation). I want to be able to upload an image through Carrierwave and store it with the data within the JSONB column rather than saving it to its own column. So my saved data for this column would be like this for example...
{
"ph":"",
"ecoli":"",
"nitri":"Less than 0.5",
"oxygen":"",
"clarity":"bottom visible",
"nitrates":"Less than 0.5",
"conditions":[
"Wildlife Death",
"Shoreline Alterations",
"Water Quality"
],
"observed_on":"2015-06-21T04:45",
"invasive_species":[
"Phragmites",
"Loosestrife",
"Dog-Strangling Vine"
],
"phosphates_threshold":"less than 0.2",
"image":[
"url": "the/url",
"thumbnail: "the/thumbnail/url",
"medium":"the/thumbnail/url"
.....
]
}
Some of the supporting code for reference...
observation.rb
class Observation < ActiveRecord::Base
belongs_to :user
has_many :comments
serialize :observation_data, HashSerializer
store_accessor :observation_data
end
observation_data.rb - tableless model
class ObservationData < ActiveRecord::Base
belongs_to :observation
mount_uploader :image, ImageUploader
end
_form.html.erb
<%= form_for #observation do |f| -%>
...Other form items
<fieldset>
<legend>Observation data</legend>
<%= render "observation_data", :f => f %>
</fieldset>
<div class="actions">
<%= f.submit "Submit", class: "button" %>
</div>
<% end %>
_observation_data.html.erb
<%= f.fields_for :observation_data, OpenStruct.new(#observation.observation_data) do |o| %>
...Other form items
<div class="field">
<%= o.label :image, "Upload an image" %>
<%= o.file_field :image %>
</div>
...Other form items
<% end %>
observations_controller.rb
class ObservationsController < ApplicationController
before_action :set_observation, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!
def index
#observations = Observation.all
#user = current_user.id
end
def show
#observations = Observation.find_by(id: params[:id])
#observation_data = #observation.observation_data
#comments = #observation.comments.all
#comment = #observation.comments.build
#user = User.find_by(id: #observation.user_id)
end
def new
#observation = Observation.new
end
def edit
end
def create
#observation = Observation.new(observation_params)
#observation.user_id = current_user.id
respond_to do |format|
if #observation.save
format.html { redirect_to #observation, notice: 'Observation was successfully created.' }
format.json { render action: 'show', status: :created, location: #idea }
else
format.html { render action: 'new' }
format.json { render json: #observation.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if #observation.update(observation_params)
format.html { redirect_to #observation, notice: 'Observation was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #observation.errors, status: :unprocessable_entity }
end
end
end
def destroy
#observation.destroy
respond_to do |format|
format.html { redirect_to root_url }
format.json { head :no_content }
end
end
private
def set_observation
#observation = Observation.find(params[:id])
end
def observation_params
params.require(:observation).permit(:user_id, :lat, :lng, :name, :description, :comment, observation_data: [:observed_on, :image, :ph, :oxygen, :ecoli, :phosphates_threshold, :clarity, :nitri, :nitrates, wildlife: [], conditions: [], invasive_species: []])
end
end
The problem for me is mount_uploader :image, ImageUploader is always looking for an :image column, how can I merge the Carrierwave response this with JSON in another column? Is it even possible?