My setup: Rails 2.3.10, Ruby 1.8.7
I have a rather complicated set of relationships between several models.
class A
has_many :classB
has_many :classD
end
class B
belongs_to :classA
has_many :classC
end
class C
belongs_to :classB
belongs_to :classE
end
class D
belongs_to :classA
belongs_to :classE
end
class E
has_many :classD
has_many :classC
end
I'm having an issue with the JSON syntax to get all the related information starting with classA. Here's what I have working so far.
classA.to_json(:include => {:classB => {:include => [:classC, :classE]}})
I can't get the syntax working to also include classD and related classE records.
UPDATE Actually something like this might work except that I can't mix hashes and arrays
classA.to_json(:include => [ :classB => { :include => { :classC => { :include => :classE } } },
:classD, :classE ])
Note that I didn't use singular/plural in my example code above but in my real code, I am. Any insights will be much appreciated.
Thanks,
Bob
This should work:
classA.to_json(:include => {
:classB => {:include => {:classC => {:include => :classE}}},
:classD => {},
:classE => {},
})
Try this, you should only need one :include =>:
classA.to_json(:include => {:classB => [:classC, { :classE => :classD }] })
I don't know if you want classE included through both class C and classD but this should work:
classA.to_json(:include => { :classB => { :include => { :classC => { :include => :classE } } },
:classD => { :include => :classE } })
EDIT:
class A
has_many :bs
has_many :ds
end
class B
belongs_to :a
has_many :cs
end
class C
belongs_to :b
belongs_to :e
end
class D
belongs_to :a
belongs_to :e
end
class E
has_many :ds
has_many :cs
end
#class_a = A.first
#class_a.to_json(:include => { :bs => { :include => { :cs => { :include => :e } } },
:ds => { :include => :e } })
Related
Why can't I join miq_user_roles with ServiceTemplate? ServiceTemplate has a column miq_group_id which is the id of miq_user_roles.
scope :public_service_templates, -> { joins(:miq_user_roles).where(miq_user_roles: { settings: nil }) }
When I try the above code I get the following error:
Can't join 'ServiceTemplate' to association named 'miq_user_roles'; perhaps you misspelled it?
Following is the actual model definition where I want to include miq_user_roles table.
class ServiceTemplate < ApplicationRecord
include SupportsFeatureMixin
DEFAULT_PROCESS_DELAY_BETWEEN_GROUPS = 120
GENERIC_ITEM_SUBTYPES = {
"custom" => N_("Custom"),
"vm" => N_("Virtual Machine"),
"playbook" => N_("Playbook"),
"hosted_database" => N_("Hosted Database"),
"load_balancer" => N_("Load Balancer"),
"storage" => N_("Storage")
}.freeze
SERVICE_TYPE_ATOMIC = 'atomic'.freeze
SERVICE_TYPE_COMPOSITE = 'composite'.freeze
RESOURCE_ACTION_UPDATE_ATTRS = [:dialog,
:dialog_id,
:fqname,
:configuration_template,
:configuration_template_id,
:configuration_template_type].freeze
include CustomActionsMixin
include ServiceMixin
include OwnershipMixin
include NewWithTypeStiMixin
include TenancyMixin
include ArchivedMixin
include CiFeatureMixin
include_concern 'Filter'
include_concern 'Copy'
validates :name, :presence => true
belongs_to :tenant
has_many :service_templates, :through => :service_resources, :source => :resource, :source_type => 'ServiceTemplate'
has_many :services
has_many :service_template_tenants, :dependent => :destroy
has_many :additional_tenants, :through => :service_template_tenants, :source => :tenant, :dependent => :destroy
has_one :picture, :dependent => :destroy, :as => :resource, :autosave => true
belongs_to :service_template_catalog
belongs_to :zone
belongs_to :currency, :inverse_of => false
has_many :dialogs, -> { distinct }, :through => :resource_actions
has_many :miq_schedules, :as => :resource, :dependent => :destroy
has_many :miq_requests, :as => :source, :dependent => :nullify
has_many :active_requests, -> { where(:request_state => MiqRequest::ACTIVE_STATES) }, :as => :source, :class_name => "MiqRequest"
virtual_column :type_display, :type => :string
virtual_column :template_valid, :type => :boolean
virtual_column :template_valid_error_message, :type => :string
virtual_column :archived, :type => :boolean
virtual_column :active, :type => :boolean
default_value_for :internal, false
default_value_for :service_type, SERVICE_TYPE_ATOMIC
default_value_for(:generic_subtype) { |st| 'custom' if st.prov_type == 'generic' }
virtual_has_one :config_info, :class_name => "Hash"
scope :with_service_template_catalog_id, ->(cat_id) { where(:service_template_catalog_id => cat_id) }
scope :without_service_template_catalog_id, -> { where(:service_template_catalog_id => nil) }
scope :with_existent_service_template_catalog_id, -> { where.not(:service_template_catalog_id => nil) }
scope :displayed, -> { where(:display => true) }
scope :public_service_templates, -> { joins(:miq_user_roles).where(miq_user_roles: { settings: nil }) }
supports :order do
unsupported_reason_add(:order, 'Service template does not belong to a service catalog') unless service_template_catalog
unsupported_reason_add(:order, 'Service template is not configured to be displayed') unless display
end
alias orderable? supports_order?
alias validate_order supports_order?
def self.with_tenant(tenant_id)
tenant = Tenant.find(tenant_id)
where(:tenant_id => tenant.ancestor_ids + [tenant_id])\
end
I want to query another table in a model definition. For instance, I have a table called miq_user_roles and I want to query and retrievesettings column value.
I tried adding the following
has_many :miq_user_roles
but when I try the where condition where(:settings => nil)
I get the error service_template doesn't have settings column. How can I query miq_user_roles for settings instead of service_template
service_template has a column called miq_group_id and its the id of miq_user_rolestable.
Following is the actual model definition where I want to include miq_user_roles table.
class ServiceTemplate < ApplicationRecord
include SupportsFeatureMixin
DEFAULT_PROCESS_DELAY_BETWEEN_GROUPS = 120
GENERIC_ITEM_SUBTYPES = {
"custom" => N_("Custom"),
"vm" => N_("Virtual Machine"),
"playbook" => N_("Playbook"),
"hosted_database" => N_("Hosted Database"),
"load_balancer" => N_("Load Balancer"),
"storage" => N_("Storage")
}.freeze
SERVICE_TYPE_ATOMIC = 'atomic'.freeze
SERVICE_TYPE_COMPOSITE = 'composite'.freeze
RESOURCE_ACTION_UPDATE_ATTRS = [:dialog,
:dialog_id,
:fqname,
:configuration_template,
:configuration_template_id,
:configuration_template_type].freeze
include CustomActionsMixin
include ServiceMixin
include OwnershipMixin
include NewWithTypeStiMixin
include TenancyMixin
include ArchivedMixin
include CiFeatureMixin
include_concern 'Filter'
include_concern 'Copy'
validates :name, :presence => true
belongs_to :tenant
has_many :service_templates, :through => :service_resources, :source => :resource, :source_type => 'ServiceTemplate'
has_many :services
has_many :service_template_tenants, :dependent => :destroy
has_many :additional_tenants, :through => :service_template_tenants, :source => :tenant, :dependent => :destroy
has_one :picture, :dependent => :destroy, :as => :resource, :autosave => true
belongs_to :service_template_catalog
belongs_to :zone
belongs_to :currency, :inverse_of => false
has_many :dialogs, -> { distinct }, :through => :resource_actions
has_many :miq_schedules, :as => :resource, :dependent => :destroy
has_many :miq_requests, :as => :source, :dependent => :nullify
has_many :active_requests, -> { where(:request_state => MiqRequest::ACTIVE_STATES) }, :as => :source, :class_name => "MiqRequest"
virtual_column :type_display, :type => :string
virtual_column :template_valid, :type => :boolean
virtual_column :template_valid_error_message, :type => :string
virtual_column :archived, :type => :boolean
virtual_column :active, :type => :boolean
default_value_for :internal, false
default_value_for :service_type, SERVICE_TYPE_ATOMIC
default_value_for(:generic_subtype) { |st| 'custom' if st.prov_type == 'generic' }
virtual_has_one :config_info, :class_name => "Hash"
scope :with_service_template_catalog_id, ->(cat_id) { where(:service_template_catalog_id => cat_id) }
scope :without_service_template_catalog_id, -> { where(:service_template_catalog_id => nil) }
scope :with_existent_service_template_catalog_id, -> { where.not(:service_template_catalog_id => nil) }
scope :displayed, -> { where(:display => true) }
scope :public_service_templates, -> { where(:display => true) }
supports :order do
unsupported_reason_add(:order, 'Service template does not belong to a service catalog') unless service_template_catalog
unsupported_reason_add(:order, 'Service template is not configured to be displayed') unless display
end
alias orderable? supports_order?
alias validate_order supports_order?
def self.with_tenant(tenant_id)
tenant = Tenant.find(tenant_id)
where(:tenant_id => tenant.ancestor_ids + [tenant_id])\
end
Add the table name:
where("miq_user_roles.settings" => nil)
Arel is nice, but you still have to use bits of SQL to get over issues like this.
You will have to use joins, to query on the associated table.
ServiceTemplate.joins(:miq_user_roles).where(miq_user_roles: { settings: nil })
I'm trying make it possible to update a a LineItem trough a CreditNote. It's for an API, so I'm trying to update that trough a JSON.
My relational model is:
class TestCreditNote < ActiveRecord::Base
self.table_name = :credit_notes
has_many :line_items, :class_name => TestLineItem, :foreign_key => :artef_id
accepts_nested_attributes_for :line_items
end
class TestLineItem < ActiveRecord::Base
self.table_name = :line_items
attr_accessible :description
belongs_to :credit_note, :class_name => TestCreditNote, :foreign_key => :artef_id
end
When executing this test:
it "should update the sales line item record" do
put "api/v1/credit_notes/#{#credit_note.id}", { :test_credit_note => { :line_items => [{ :description => 'PEPITO'}] }}, http_headers
data = JSON.parse(response.body, :symbolize_names => true)
TestCreditNote.find(#sales_credit_note.id).line_item.description.should == 'PEPITO'
end
It fails because of:
ActiveModel::MassAssignmentSecurity::Error:
Can't mass-assign protected attributes: line_items
I've add the attr_accesible :line_items_attributes
class TestCreditNote < ActiveRecord::Base
self.table_name = :credit_notes
has_many :line_items, :class_name => TestLineItem, :foreign_key => :artef_id
accepts_nested_attributes_for :line_items
attr_accessible :line_items_attributes
end
And the same in the test
it "should update the sales line item record" do
put "api/v1/credit_notes/#{#credit_note.id}", { :test_credit_note => { :line_items_attributes => [{:id => 1, :description => 'PEPITO'}] }}, http_headers
data = JSON.parse(response.body, :symbolize_names => true)
TestCreditNote.find(#sales_credit_note.id).line_item.description.should == 'PEPITO'
end
I have three models (simplified here):
class Child < ActiveRecord::Base
has_many :childviews, :dependent => :nullify
has_many :observations, :through => :childviews
end
class Childview < ActiveRecord::Base
belongs_to :observation
belongs_to :child
end
class Observation < ActiveRecord::Base
has_many :childviews, :dependent => :nullify
has_many :children, :through => :childviews
end
I'm sending this to some JavaScript using Rails' to_json method like this:
render :layout => false , :json => #child.to_json(
:include => {
:observations => {
:include => :photos,
:methods => [:key, :title, :subtitle]
}
},
:except => [:password]
)
This works perfectly. Observations are retrieved fine 'through' the join table (childviews).
However, I also want to get at data that sits in the childviews join table; specifically the value for 'needs_edit'.
I can't figure out how to get at this data in a to_json call.
Can anyone help me? Many thanks in advance.
qryss
Not sure, but shouldn't this work?
#child.to_json(
:include => {
:observations => {
:include => :photos,
:methods => [:key, :title, :subtitle]
},
:childviews => { :only => :needs_edit }
},
:except => [:password]
)
EDIT:
This might work too, since childviews belongs_to the overvation:
#child.to_json(
:include => {
:observations => {
:include => { :photos, :childviews => { :only => :needs_edit } }
:methods => [:key, :title, :subtitle]
}
},
:except => [:password]
)
Thanks to Rock for the pointers - I now have it working!
This code:
#child.to_json(:include =>
{
:observations => {
:include => {
:photos => {},
:childviews => {:only => :needs_edit}
},
:methods => [:S3_key, :title, :subtitle]
}
},
:except => [:password]
)
gives me this output (abbreviated for clarity):
{
"child":
{
"foo":"bar",
"observations":
[
{
"foo2":"bar2",
"photos":
[
{
"foo3":"bar3",
}
],
"childviews":
[
{
"needs_edit":true
}
]
}
]
}
}
Thank you, Rock! That was doing my head in.
:)
qryss
I want to add a has_many through association to a activerecord model class for each symbol in an array. for example
PeopleOrganisation::ROLES.each do |role|
has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
:conditions => "people_organisations.role = '#{role.to_s}'" do
def << (object)
PeopleOrganisation.send(:with_scope, :create => {:role => **role**}) { self.concat object }
end
end
end
everything works fine except for the reference to the role variable inside the method def. This is because the method def is not a closure. Is there a way of achieving what I want?
Try this:
PeopleOrganisation::ROLES.each do |role|
has_many(role.to_s.pluralize.to_sym,
:through => :people_organisations, :source => :person,
:conditions => ["people_organisations.role = ?", role]
) do
define_method("<<") do |object|
PeopleOrganisation.send(:with_scope, :create => {:role => role}) {
self.concat object
}
end
end
end
Instead of defining method using def you can try define_method method:
PeopleOrganisation::ROLES.each do |role|
has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
:conditions => "people_organisations.role = '#{role.to_s}'" do
define_method(:<<) do |object|
PeopleOrganisation.send(:with_scope, :create => {:role => role}) { self.concat object }
end
end
end