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Setup for nested form in ruby on rails
The first to thing to have: a model that contains a has_many relation with another model.
class Project < ApplicationRecord
has_many :todos
end
class Todo < ApplicationRecord
belongs_to :project
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In ProjectsController:
class ProjectsController < ApplicationController
def new
@project = Project.new
end
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In a nested form, you can create child objects with a parent object at the same time.
<%= nested_form_for @project do |f| %>
<%= f.label :name %>
<%= f.text_field :name %>
<% # Now comes the part for `Todo` object %>
<%= f.fields_for :todo do |todo_field| %>
<%= todo_field.label :name %>
<%= todo_field.text_field :name %>
<% end %>
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As we initialized @project with Project.new to have something for creating a new Project object, same way for creating a Todo object, we have to have something like this, and there are multiple ways to do so:
- In Projectscontroller, in new method, you can write: @todo = @project.todos.build or @todo = @project.todos.new to instantiate a new Todo object.
- You can also do this in view: <%= f.fields_for :todos, @project.todos.build %>
For strong params, you can include them in the following way:
def project_params
params.require(:project).permit(:name, todo_attributes: [:name])
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Since, the Todo objects will be created through the creation of a Project object, so you have to specify this thing in Project model by adding the following line:
accepts_nested_attributes_for :todos