Home PHP C# C++ Android Java Javascript Python IOS SQL HTML Categories

has_many through, with conditions

You'er likely having issues with syntax. These associations:

has_many :private_tags, -> { where
:private_tag => true }, through: :pictures_tags
has_many :user_tags, -> { where :user_tag =>
true }, through: :pictures_tags

are fine. The problem is with:

has_many :tags, -> { where
:private_tag => false and :user_tag => false
}, through: :pictures_tags

because where clause does not take a condition as an argument (it is not a valid condition either), but a Hash. So it would be:

has_many :tags, -> { where
:private_tag => false, :user_tag => false },
through: :pictures_tags

Categories : Ruby On Rails

Related to : has_many through, with conditions
3 conditions with and does not work
You have complicated the query with unnecessary DBObjects. The below code represents how to build the DBObject with a condition to match the documents with entity in 11 or 12, and time = 20141105230011. MongoClient mongoClient = new MongoClient("localhost", 27017); DB db = mongoClient.getDB("test"); DBCollection coll = db.getCollection("test"); DBObject inOp = new BasicDBObject()

Categories : Mongodb
If and only if all given conditions are true
Use all: if all(len(row[0]) == len(column[i]) for i in range(len(rows))): #do something only if all of the lengths check out

Categories : Python
C# Multiple conditions
Yup, you're just looking for the || (conditional-OR) operator: if (kTonerIsLow || cTonerIsLow || ...) { SendEmail(); } Note that the operator is short-circuiting - so if kTonerIsLow is true, it won't evaluate cTonerIsLow, etc. If you use | instead, it will still work - but it will evaluate both operands unconditionally. Additionally, this comment struck me: The code to send a e-mail i

Categories : C#
I Need Someone to Explain the Query Conditions
<> stands for != (does not equal to). It's pretty old school - most newer languages do not use that. Also, ? (a question mark) represents a parameter in a query. More info here.

Categories : Java
Create SQL query with given Conditions
Does this answer your question? SELECT SUM(some_col) FROM ... WHERE (column_A = 'X' AND some_condition1 AND some_condition2) OR (column_A = 'Y' AND some_condition3 AND some_condition4) OR (column_A = 'Z' AND some_condition5 AND some_condition6) GROUP BY column_A;

Categories : SQL
Recently Add
Groups and Users has many oder has many through?
Rails format specifier differences
Capistrano can not create symlinks: file exist
Admin can't delete users. Ruby on Rails 3 - Michael Hartl
Don't show user name who create post
Using Wicked with Devise (2 step signup process)
RubyOnRails Rake test failures
Rails session start event handler
Why ActiveModel::ForbiddenAttributesError error?
How can i track the issue in production RAILS
Cannot install spree gem - ERROR: invalid gem: package is corrupt
Why are the nested resources for Devise authentication not working?
Rails Devise - how to open access to the site root
Rails: respond_with the same template for two methods
rails with postgresl database "role postgres does not exist"
Instance variable in Rails helper not set
Monkey patch rails 3.2 rake task
Rails_admin: Should I have admin_user or user with admin role to manage users and admin panel
undefined method `attachments' for nil:NilClass
Memory usage increase with Ruby 2.1 versus Ruby 2.0 or 1.9
Can a Rails app be deployed without using Heroku Toolbelt? If so, how?
Enable random access to collection with MongoDB
libmysqlclient-dev installation fails
undefined method `name' for nil:NilClass. Can't find but @followed is set
Allowing an arbitrary domain and subdomain in session_store.rb
Pushmeup Gem - Can't send push notifications in Active Admin model
Rails console does not start
GitHub Import: Could not locate Gemfile
AWS::S3::PermanentRedirect in SongsController#index "The bucket you are attempting to access must be addressed using the specified endpoint"
automatically create ActiveRecord parent for association
© Copyright 2017 Publishing Limited. All rights reserved.