I have this freeform SQL that when run returns the name of a product, name of the associate attribute and the value for that attribute. What I am trying to work out is how I can use the with Ruby on Rails and Active Record
Freeform Query
select menu_items.name, menu_attributes.name, menu_attributes_items.menu_attribute_value from menu_attributes, menu_items, menu_attributes_items, venues
where menu_items.id = menu_attributes_items.menu_item_id
and menu_attributes.id = menu_attributes_items.menu_attribute_id
and venues.id = menu_attributes_items.venue_id
and menu_attributes.name = 'Price'
This is my current HAMl Template, though it only returns a list of the attributes i.e. Price, Size and not the values like the SQL does
- for item in #venue.menu_items
.grid-content
.card
= image_tag("drinks/#{item.name.titlecase.tr(' ','-')}.png")
%img{:src => "http://placehold.it/400x200?text=Coffee"}
.card-divider
= item.name
.card-section
%h4
- for attr in item.menu_attributes
= attr.name
= MenuItem.joins({ menu_attributes: :menu_attributes_items }, :venues).where('menu_items.id = menu_attributes_items.menu_item_id AND menu_attributes.id = menu_attributes_items.menu_attribute_id AND menu_attributes.id = menu_attributes_items.menu_attribute_id AND venues.id = menu_attributes_items.venue_id AND menu_attributes.name = ?', 'Price').select('menu_items.name, menu_attributes.name, menu_attributes_items.menu_attribute_value')
Updates
Price # Size # Size #
Depending on the associations among your models and still with a slight touch of SQL, your query can be written with ActiveRecord this way:
MenuItem.joins({ menu_attributes: :menu_attributes_items }, :venues)
.where('menu_items.id = menu_attributes_items.menu_item_id AND menu_attributes.id = menu_attributes_items.menu_attribute_id AND menu_attributes.id = menu_attributes_items.menu_attribute_id AND venues.id = menu_attributes_items.venue_id AND menu_attributes.name = ?', 'Price')
.select('menu_items.name, menu_attributes.name, menu_attributes_items.menu_attribute_value')
Related
Update: See the "Update" section below for the latest.
I have been working with Knex.js to build SQL queries in Node.js, and have the following code. This code works on a sort of graph data model (nodes and links), where there is a links table which has everything (links link to links). Given this code, I am wondering how I can make it one query instead of one query per attribute which is how it is now. The getTableName() function returns a string_links table for string values, and <x>_links tables for the other datatypes, while the "basic" links table is just called links.
Essentially how this works is, first query the top level where the parent_id is equal to some "type" ID, say we are querying "user" objects, the type would be "user". So let instance = ... is getting all the instance links from this user type. Then we go through each field of a query (a query for now is just boolean-valued map, like { email: true, name: true }). For each field of the query, we make a query to find all those nodes, linked off the instance, as so-called property links.
There are two types of properties, but don't need to go into too much detail on that. Essentially there are complex properties with audit trails and simple properties without audit trails. That is what is meant by the interactive branch in the logic.
How can I make this into one SQL query? The SQL query it prints out for an example is like this:
select "id" from "links" where "parent_id" = '47c1956bz31330c' and "name" = 'link' limit 1
select "value" from "string_links" where "parent_id" = (select "value" from "links" where "parent_id" = '47c1956bz31330cv' and "name" = 'name' limit 1) and "name" = 'value' limit 1
select "value" from "text_links" where "parent_id" = (select "value" from "links" where "parent_id" = '47c1956bz31330cv' and "name" = 'website' limit 1) and "name" = 'value' limit 1
select "value" from "integer_links" where "parent_id" = (select "value" from "links" where "parent_id" = '47c1956bz31330cv' and "name" = 'revenue' limit 1) and "name" = 'value' limit 1
select "value" from "boolean_links" where "parent_id" = '47c1956bz31330' and "name" = 'verified' limit 1
The original Node.js for Knex.js is here, but really I'm just concerned with how to write this as one regular SQL query, and I can figure out how to make it in Knex.js from there:
async function selectInteractiveInstance(user, name, query) {
const type = model.types[name]
const typeId = await baseSchemaController.selectType(name)
let instance = await knex.from(`links`)
.select('id')
.where('parent_id', typeId)
.where('name', 'instance')
.first()
// { id: 123, props: { ... } }
instance.props = {}
for (let field in query) {
let data = query[field]
let attrSchema = type[field]
const tableName = baseSchemaController.getTableName(attrSchema.type)
if (attrSchema.interactive) {
const query1 = knex
.from(`links`)
.select('value')
.where('parent_id', instance.link)
.where('name', field)
.first()
const record = await knex
.from(tableName)
.select('value')
.where('home', query1)
.where('name', 'value')
.first()
if (record) {
instance.props[field] = record.value
}
} else {
const record = await knex
.from(tableName)
.select('value')
.where('parent_id', instance.id)
.where('name', field)
.first()
if (record) {
instance.props[field] = record.value
}
}
}
return instance
}
The reason for asking is because the number of queries of this function is equal to the number of properties on the object, and I would like to avoid that, but not really that great at SQL yet. I don't see a straightforward or clear path on how to make this into one query, or know if it's possible.
It's also an issue for the following reason. If I want to grab 100 links, and their "fields" (in the primitive link tables), such that the primitive link values match a certain value, then you need to query all field tables simultaneously to see if the query can be satisfied.
Update
I finally landed on a query that works in the optimistic case:
select
"x"."id" as "id",
"s1"."value" as "name",
"s2"."value" as "inc_id",
"s3"."value" as "website",
"s4"."value" as "revenue",
"s5"."value" as "verified"
from "links" as "x"
inner join "links" as "c1" on "c1"."parent_id" = "x"."id"
inner join "string_links" as "s1" on "s1"."parent_id" = "c1"."value"
inner join "links" as "c2" on "c2"."parent_id" = "x"."id"
inner join "string_links" as "s2" on "s2"."parent_id" = "c2"."value"
inner join "links" as "c3" on "c3"."parent_id" = "x"."id"
inner join "text_links" as "s3" on "s3"."parent_id" = "c3"."value"
inner join "links" as "c4" on "c4"."parent_id" = "x"."id"
inner join "integer_links" as "s4" on "s4"."parent_id" = "c4"."value"
inner join "boolean_links" as "s5" on "s5"."parent_id" = "x"."id"
where "x"."parent_id" = '47c1956bz31330'
and "x"."name" = 'link'
and "c1"."name" = 'name'
and "s1"."name" = 'value'
and "c2"."name" = 'inc_id'
and "s2"."name" = 'value'
and "c3"."name" = 'website'
and "s3"."name" = 'value'
and "c4"."name" = 'revenue'
and "s4"."name" = 'value'
and "s5"."name" = 'verified'
This returns an object similar to what I am looking for, joining the same table several times, along with the primitive tables.
However, if any of the values are not linked (are socalled "null" in this context), then the inner join will fail and it will return nothing. How can I still have it return a subset of the object properties, whatever it can find? Is there anything like optional inner joins or anything like that?
Use LEFT JOIN and move possibly unsatisfied predicates to ON clause. Kind of
select
"x"."id" as "id",
"s1"."value" as "name",
"s2"."value" as "inc_id",
"s3"."value" as "website",
"s4"."value" as "revenue",
"s5"."value" as "verified"
from "links" as "x"
left join "links" as "c1" on "c1"."parent_id" = "x"."id" and "c1"."name" = 'name'
left join "string_links" as "s1" on "s1"."parent_id" = "c1"."value" and "s1"."name" = 'value'
left join "links" as "c2" on "c2"."parent_id" = "x"."id" and "c2"."name" = 'inc_id'
left join "string_links" as "s2" on "s2"."parent_id" = "c2"."value" and "s2"."name" = 'value'
left join "links" as "c3" on "c3"."parent_id" = "x"."id" and "c3"."name" = 'website'
left join "text_links" as "s3" on "s3"."parent_id" = "c3"."value" and "s3"."name" = 'value'
left join "links" as "c4" on "c4"."parent_id" = "x"."id" and "c4"."name" = 'revenue'
left join "integer_links" as "s4" on "s4"."parent_id" = "c4"."value" and "s4"."name" = 'value'
left join "boolean_links" as "s5" on "s5"."parent_id" = "x"."id" and "s5"."name" = 'verified'
where "x"."parent_id" = '47c1956bz31330'
and "x"."name" = 'link'
I need to select all products with specific attribute (barcolor) and then update attribute with another value.
EXAMPLE.
I would like to select all SKU with barcolor = LIGHT GREEN and update them to GREEN.
Thanks!
you can do this from backend. you can go to catalog > manage products > select all products > at the right side you can see update attributes option , select that and click on submit and you will redirect to another page and than give the value in required field and save it.
It can be achieve by programming also.
If you have attribute option ID than:
$sAttributeName = 'brands';
$mOptionValueId = 250; // 250 is Id of Brand 1
$newOptionValueId = 255; // 255 is Id of Brand 2
$productsCollection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*')
->addFieldToFilter(
$sAttributeName,
array(
'eq' => $mOptionValueId
)
);
$storeId = Mage::app()->getStore()->getStoreId();
foreach($productsCollection as $product) {
$productId = $product->getId();
Mage::getSingleton('catalog/product_action')->updateAttributes(
array($productId),
array('brands' => $newOptionValueId),
$storeId
);
}
If you do not have attribute option ID than you can use the option value directly as:
$sAttributeName = 'brands';
$mOptionValue = 'Brand 1';
$newOptionValue = 'Brand 2';
$productsCollection = Mage::getModel('catalog/product')->getCollection()
->addAttributeToSelect('*')
->addFieldToFilter(
$sAttributeName,
array(
'eq' => Mage::getResourceModel('catalog/product')
->getAttribute($sAttributeName)
->getSource()
->getOptionId($mOptionValue)
)
);
$storeId = Mage::app()->getStore()->getStoreId();
foreach($productsCollection as $product) {
$productId = $product->getId();
Mage::getSingleton('catalog/product_action')->updateAttributes(
array($productId),
array('brands' => Mage::getResourceModel('catalog/product')
->getAttribute($sAttributeName)
->getSource()
->getOptionId($newOptionValue)),
$storeId
);
}
If you have the list of the entity_ids for all the products and you are using a custom attribute, you can run an SQL query for each and every product like so:
UPDATE `catalog_product_entity_varchar` SET value = 'NEW BLACK' WHERE entity_id = '12345' AND attribute_id = 'attribute_id_here';
You can also filter the fields by:
SELECT entity_id,value FROM catalog_product_entity_varchar WHERE value LIKE 'something';
I'm trying to find an object by checking for several of its relations.
Loan.joins(:credit_memo_attributes)
.where(credit_memo_attributes: {name: 'pr2_gtx1_y', value: '2014'})
.where(credit_memo_attributes: {name: 'pr1_gtx1_y', value: '2013'})
.where(credit_memo_attributes: {name: 'tx1_y', value: '2014'})
Calling to_sql on that gives:
"SELECT `loans`.* FROM `loans` INNER JOIN `credit_memo_attributes`
ON `credit_memo_attributes`.`loan_id` = `loans`.`id`
WHERE `credit_memo_attributes`.`name` = 'pr2_gtx1_y' AND `credit_memo_attributes`.`value` = '2014'
AND `credit_memo_attributes`.`name` = 'pr1_gtx1_y' AND `credit_memo_attributes`.`value` = '2013'
AND `credit_memo_attributes`.`name` = 'tx1_y' AND `credit_memo_attributes`.`value` = '2014'"
So, I'm checking for Loans that have credit_memo_attributes with all of those attributes. I know at least 1 of our 20,000 loans meets this criteria, but this query returns an empty set. If I only use 1 of the where clauses, it returns several, as I'd expect, but once I add even 1 more, it's empty.
Any idea where I'm going wrong?
Update:
Based on comments I believe you want multiple joins in your criteria. You can do that like this:
attr_1 = {name: 'pr2_gtx1_y', value: '2014'}
attr_2 = {name: 'pr1_gtx1_y', value: '2013'}
attr_3 = {name: 'tx1_y', value: '2014'}
Loan.something_cool(attr_1, attr_2, attr_3)
class Loan < ActiveRecord::Base
...
def self.something_cool(attr_1, attr_2, attr_3)
joins(sanitize_sql(["INNER JOIN credit_memo_attributes AS cma1 ON cma1.loan_id = loans.id AND cma1.name = :name AND cma1.value = :value", attr_1]))
.joins(sanitize_sql(["INNER JOIN credit_memo_attributes AS cma2 ON cma2.loan_id = loans.id AND cma2.name = :name AND cma2.value = :value", attr_2]))
.joins(sanitize_sql(["INNER JOIN credit_memo_attributes AS cma3 ON cma3.loan_id = loans.id AND cma3.name = :name AND cma3.value = :value", attr_3]))
end
If you look at the SQL generated (that you included in your question, thank you) you'll see that all those conditions are being ANDed together. There are NO rows for which name = 'pr2_gtx1_y' AND name = 'pr1_gtx1_y' (and so forth). So you are getting the result I would expect (no rows).
You can put all names and values into array like ids and years and pass those into where clause like this. Active Record will query all the values in the array.
Loan.joins(:credit_memo_attributes)
.where(credit_memo_attributes: {name: ids, value: years})
Personally I'm still learning active record, in this concern i don't think active record supports multiple where clauses.
Notice how the SQL version is returning your code: it is joining the requirements with an AND.
"SELECT `loans`.* FROM `loans` INNER JOIN `credit_memo_attributes`
ON `credit_memo_attributes`.`loan_id` = `loans`.`id`
WHERE `credit_memo_attributes`.`name` = 'pr2_gtx1_y' AND `credit_memo_attributes`.`value` = '2014'
AND `credit_memo_attributes`.`name` = 'pr1_gtx1_y' AND `credit_memo_attributes`.`value` = '2013'
AND `credit_memo_attributes`.`name` = 'tx1_y' AND `credit_memo_attributes`.`value` = '2014'"
Now, this is next to impossible. An Object.name can never be all pr2_gtx1_y, pr1_gtx1_y, and tx1_y. Same goes for the value attributes.
What you need here is an OR as opposed to the AND.
To this effect, try to change your query to the following:
Loan.joins(:credit_memo_attributes)
.where(
"credit_memo_attributes.name = ? and credit_memo_attributes.value = ?
OR credit_memo_attributes.names = ? and credit_memo_attributes.value = ?
OR credit_memo_attributes.name = ? and credit_memo_attributes.value = ?",
'pr2_gtx1_y', '2014',
'pr1_gtx1_y', '2013',
'tx1_y', '2014'
)
I need a list of ACTIVE products from the magento database with the following information.
If there are additional information that is fine, but the following information need to be there.
SKU:
PRODUCT NAME:
PRODUCT CATEGORY:
SHORT DESCRIPTION:
LONG DESCRIPTION:
WEIGHT:
What is the way to write a query for this. I just need to get the data. No php, just sql query.(Db structure is bit complex)
try that, it works to get the product data: (status = 2 = product disabled, status = 1 = product enabled)
SELECT `e`.*, IF(_table_status.value_id > 0, _table_status.value, _table_status_default.value) AS `status
FROM `mage_catalog_product_entity` AS `e`
INNER JOIN `mage_catalog_product_entity_int` AS `_table_status_default`
ON (`_table_status_default`.`entity_id` = `e`.`entity_id`)
AND (`_table_status_default`.`attribute_id` = '80')
AND `_table_status_default`.`store_id` = 0
LEFT JOIN `mage_catalog_product_entity_int` AS `_table_status`
ON (`_table_status`.`entity_id` = `e`.`entity_id`)
AND (`_table_status`.`attribute_id` = (SELECT attribute_id FROM mage_eav_attribute WHERE attribute_code = 'status' AND entity_type_id = 4))
AND (`_table_status`.`store_id` = '1')
WHERE (IF(_table_status.value_id > 0, _table_status.value, _table_status_default.value) = '2')
For the category you will need some extra work. I get this sql query by doing the following in PHP and the Magento collection:
/* #var $productCollection Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection */
$productCollection = Mage::getModel('catalog/product')->getCollection();
$productCollection->addFieldToFilter('status', array('eq' => '2'))->load(true);
I want to generate a SQL query like the following using Ruby's Sequel:
SELECT * FROM Objects WHERE (color = "red" AND shape = "triangle") OR
(color = "blue" AND shape = "square") OR
(color = "green" AND shape = "circle")
I want to build this query programmatically from a list of conditions, so that I can do something like this:
conditions = [[[:color, "red"], [:shape, "triangle"]],
[[:color, "blue"], [:shape, "square"]],
[[:color, "green"], [:shape, "circle"]]]
DB[:Users].where(conditions.sql_or)
It doesn't have to follow that exact form, but I want to be able to build the conditions programmatically, so it's not sufficient to be able to construct this query by hand.
Try this:
conditions = [
{:color => "red", :shape => "triangle"},
{:color => "blue", :shape => "square"},
{:color => "green", :shape => "circle"}
]
head, *tail = *conditions
tail.inject(DB[:Users].filter(head)){|mem,obj| mem.or(obj) }
I get:
=> #<Sequel::Postgres::Dataset: "SELECT * FROM \"Users\" WHERE (((\"color\" = 'red') AND (\"shape\" = 'triangle')) OR ((\"color\" = 'blue') AND (\"shape\" = 'square')) OR ((\"color\" = 'green') AND (\"shape\" = 'circle')))">
I think this will return an equivalent result, using a different SQL query:
DB[:Objects].where('(color, shape) in ?', conditions.sql_value_list).sql
=> "SELECT * FROM `Objects` WHERE ((color, shape) in (('red', 'triangle'), ('blue', 'square'), ('green', 'circle')))"
sql_value_list is documented in http://sequel.rubyforge.org/rdoc/classes/Array.html
Otherwise use:
objects = DB[:Objects].where(conditions[0])
conditions[1 .. -1].each { |c| objects = objects.or(c) }
Which results in:
SELECT * FROM `Objects` WHERE (((`color` = 'red') AND (`shape` = 'triangle')) OR ((`color` = 'blue') AND (`shape` = 'square')) OR ((`color` = 'green') AND (`shape` = 'circle')))
I was looking at Iain's answer, and it's basically the same as my second one, only more succinct; I like its elegance.