This is weird, it never happens to me before
Im on the rails console, because my search form is not working, for some reason when i do a search using the row called 'nombre', the search doesnt work, this is the output data:
First, I will show you my table data:
2.3.0 :035 > Item.all
Item Load (0.6ms) SELECT "items".* FROM "items"
=> #<ActiveRecord::Relation [#<Item id: 1, nombre: "Melamina Blanca", espesor: 18, material: "MDF", quantity: 14, created_at: "2016-08-04 00:56:13", updated_at: "2016-08-30 00:05:01">, #<Item id: 2, nombre: "Melamina Gris Grafito", espesor: 15, material: "Aglo", quantity: 9, created_at: "2016-08-04 00:56:13", updated_at: "2016-08-30 00:05:01">, #<Item id: 3, nombre: "Melamina Azul", espesor: 18, material: "MDF", quantity: 26, created_at: "2016-08-04 00:56:13", updated_at: "2016-08-30 00:05:01">, #<Item id: 4, nombre: "Melamina Rojs", espesor: 18, material: "MDF", quantity: 5, created_at: "2016-08-04 00:56:13", updated_at: "2016-08-30 00:05:01">]>
2.3.0 :036 >
So as you can see, the first item, the name (nombre) is 'Melamina Blanca'
If I do the search, I get the following:
item = Item.where("nombre LIKE ?", "Blanca")
Item Load (0.8ms) SELECT "items".* FROM "items" WHERE (nombre LIKE 'Blanca')
=> #<ActiveRecord::Relation []>
So I tried to search by another row, on this case called 'Material'
item = Item.where("material LIKE ?", "Aglo")
Item Load (0.5ms) SELECT "items".* FROM "items" WHERE (material LIKE 'Aglo')
=> #<ActiveRecord::Relation [#<Item id: 2, nombre: "Melamina Gris Grafito", espesor: 15, material: "Aglo", quantity: 9, created_at: "2016-08-04 00:56:13", updated_at: "2016-08-30 00:05:01">]>
I get a correct search, I tried with the other rows and all of them work, except the one I need, which is 'nombre'
Any ideas why?
I think the problem is you are searching for an exact match. To search for a pattern string, you have to use % which defines wildcards.
Try
Item.where("nombre LIKE ?", "%Blanca%")
This will look for records with names that contain "Blanca" in it.
If you want to search for names that start with "Blanca", use
Item.where("nombre LIKE ?", "Blanca%")
Or for names ending with "Blanca", use
Item.where("nombre LIKE ?", "%Blanca")
Note: Your search across material "Aglo" was successful because the material field in the record contained the exact string "Aglo".
Hope this helps!
Related
I'm very new to rails, and am a little stuck on the logic for this problem.
I have one table (using mysql) of employees, each of them with a manager_id key which refers to the employee they report to. So for example the employee with the title of "CEO" with an id of 1, has a manager_id of nil, and the employee with title of "CTO" has a manager_id of 1. So my records look like this
id: 1, first_name: "Bob", last_name: "Boss", title: "CEO", manager_id: null
id: 2, first_name: "Pat", last_name: "Guy", title: "CTO", manager_id: 1
id: 3, first_name: "John", last_name: "Dude", title: "VP of engineering", manager_id: 2
and my JSON structure should look like this
[
{id: 1, first_name: "Bob", last_name: "Boss", title: "CEO", manager_id: null, descendents: [
{id: 2, first_name: "Pat", last_name: "Guy", title: "CTO", manager_id: 1, descendents: [
{id: 3, first_name: "John", last_name: "Dude", title: "VP of engineering", manager_id: 2, descendents: [....]}
]},
{..more CEO descendents...}
]
I'm trying to create a nested JSON structure that starts at CEO, lists all employees that report to them, and each of those employees descendants. I was trying to write a script that creates this but I keep getting infinite recursive calls. This is what I have
#start at some root
#root = Employee.find_by title: 'CEO'
#convert to hash table
#results[0] = #root.attributes
#add direct_reports key
#results[0]["direct_reports"] = []
def getBelow(root=#root)
#reports = Employee.where("manager_id = ?", #root[:id])
if #reports.blank?
return []
else
#reports = #reports.map(&:attributes)
#reports.each do |person|
person["direct_reports"] = []
getBelow(person)
end
#reports = Employee.where("manager_id = ?", #root[:id])
root["direct_reports"] = #reports
end
return #root
end
#list = getBelow(#results[0])
If I'm passing in each new person object, shouldn't they all eventually end when #reports.blank? becomes true?
An alternative I was thinking of was to use table associations inspired by this blog post
https://hashrocket.com/blog/posts/recursive-sql-in-activerecord
but that seems a little too complicated.
Some issues in the getBelow method
You are always using #root, instead of using the param (root). So you are always starting again from the 'CEO'.
You are calling getBelow recursively but you are not using the result.
You call #reports = Employee.where("manager_id = ?", #root[:id]) twice.
You return #root.
As Jorge Najera said, there are gems that handle a tree structure easily. If you want to build it on your own, this is my suggestion:
#start at some root
#root = Employee.find_by manager_id: nil
#convert to hash table
#tree = #root.attributes
#add direct_reports key
#tree["direct_reports"] = getBelow(#root)
def getBelow(manager)
branch = []
Employee.where("manager_id = ?", manager.id).each do |employee|
node = employee.attributes
node["direct_reports"] = getBelow(employee)
branch << node
end
branch
end
This was not tested so I think you´ll get some errors, but I believe the idea is fine.
I am using jbuilder in rails to generate some JSON in a rails app.
In my models, 'od_items' belong to 'od', and 'ods' belong to 'sophead'.
I want to display each 'od' of the 'sophead', and then nested under each of these, I want to display each of the 'od_items' that belong to the 'od'.
Here is my code so far:
json.ods #sophead.ods do |od|
json.od od
json.od_items od.od_items do |od_item|
json.od_item od_item
end
end
This is outputting the following JSON:
ods: [
{
od: {
id: 51,
sophead_id: 386,
created_at: "2018-03-21T15:28:48.802Z",
updated_at: "2018-03-21T15:28:48.802Z",
status: "Open"
},
od_items: [
{
od_item: {
id: 285,
od_id: 51,
qty: "1.0",
part: "CARRIAGE CHARGE",
description: "Simpson Carriage Charge",
created_at: "2018-03-21T15:28:48.823Z",
updated_at: "2018-03-21T15:28:48.823Z"
}
},
{
od_item: {
id: 284,
od_id: 51,
qty: "1.0",
part: "MISCELLANEOUS",
description: "Split Box Charge",
created_at: "2018-03-21T15:28:48.816Z",
updated_at: "2018-03-21T15:28:48.816Z"
}
}
]
}
],
The problem is that I want 'od_items' to be nested inside the 'od' that it relates to, instead it appears next to it.
This should be pretty simple to sort out, but I cant find anything online.
(First question on Stack overflow - Thanks very much in advance)
If your #sophead.ods is a collection of hashes, you can easily achieve it merging the od element with its od_items:
json.ods #sophead.ods do |od|
json.od od.merge(od_items: od.od_items)
end
Since it seems that these are ActiveRecords:
json.ods #sophead.ods do |od|
json.od od.as_json.merge(od_items: od.od_items.map(&:as_json))
end
According to the README, another way to obtain the same result is to use json.merge!:
json.ods #sophead.ods do |od|
json.od do
json.id od.id
json.sophead_id od.sophead_id
json.created_at od.created_at
json.updated_at od.updated_at
json.status od.status
json.merge! { od_items: od.od_items.as_json}
end
Another approach which assures better performances would be to use ActiveModelSerializer instead.
class OdSerializer < ActiveModelSerializers::Model
attributes :id, :sophead_id, :created_at, :updated_at, :status
has_many :od_items, serializer: OdItemSerializer
end
class OdItemSerializer < ActiveModelSerializers::Model
attributes :id, :od_id, :qty, :part, :description, :created_at, :updated_at
end
# And in the controller
render json: #sophead.ods, each_serializer: OdSerializer
I have a model called SystemState. Following is the migration that created this table:
create_table :system_states do |t|
t.string :code
t.timestamps
end
But, even if code column is of string type, when I do the following:
> SystemState.first
> #<SystemState id: 1, code: 0, created_at: "2017-03-14 10:19:45", updated_at: "2017-03-14 10:28:33">
> SystemState.find(1).update_attributes(code: "system_alert_notification")
> SystemState.first
> #<SystemState id: 1, code: 0, created_at: "2017-03-14 10:19:45", updated_at: "2017-03-14 10:29:43">
As can be seen, it always updates it as 0(integer).
Is the column name reserved or something? Keen to know the cause of above.
Here are some possibilities :
1) May be code is a reserved word in mysql
2) Also, I'm sure, the column in your db is of integer type. Change it to string and it should work.
In my controller, I need to pluck a single, matching integer value and then create a record with that value in another table. In action, it looks like this:
if Participation.where(ranking: "1")
first = PointsAllocation.where(game_id: params[:game_id]).where(place: "1").pluck(:points)
Stack.create(game_id: params[:game_id], user_id: current_user.id, chips: first)
else
end
I have tested in the console that the first variable is definable. If I run PointsAllocation.where(game_id: "1").where(place: "1").pluck(:points), it will return:
SELECT "points_allocations"."points" FROM "points_allocations" WHERE "points_allocations"."game_id" = 1 AND "points_allocations"."place" = 1
=> [10]
Ok, so it is correctly plucking what looks like an integer value for Points. I then want to use this points value and send it to the Chips column in the Stack table. When I run this, it will add a nil record even though first is defined, like so:
<Stack id: 1, game_id: 1, user_id: 1, chips: nil>
In troubleshooting, I thought maybe the issue here is that even though it looks like an integer (and Chips, I should add, is a t.integer attribute), maybe it's accidentally a string or something from pluck. So let's map this to an integer to be safe by adding map(&:to_i) after the pluck.
When I do that, it gets weirder, as it now returns:
<Stack id: 9, game_id: 1, user_id: 1, chips: 0>
So when I convert it to an integer, it changes 10 to a 0 and adds it to the table.
Where am I going wrong?
You may resolve it loading only one object instead ActiveRecord::Association:
first = PointsAllocation.where(game_id: params[:game_id]).where(place: "1").first
points = first.points
Stack.create(game_id: params[:game_id], user_id: current_user.id, chips: points)
Problem is that AR trying convert incorrect values if they type different with column type:
Stack.create(chips: 10)
#=> <Stack id: ..., chips: 10>
Stack.create(chips: [10])
#=> <Stack id: ..., chips: nil>
Stack.create(chips: "10")
#=> <Stack id: ..., chips: 10>
Stack.create(chips: "first")
#=> <Stack id: ..., chips: 0>
Guys I'm using a select() tag in .html.erb file as follows
<%= select(:hfi_id, b.beneficiaryloans.collect { |h| [User.find(h.hfi_id).firstname, h.hfi_id] }) %>
what's wrong in this statement? actually it is giving an error called
wrong number of arguments (2 for 3) - error for above line
But same thing I executed in irb console, it's working fine like
irb(main):012:0> me=Beneficiary.find(1)
=> #<Beneficiary id: 1, firstname: "Mohan", lastname: "Bairwa", address: "1399 m.k.b jagatpira", age: 24, sex: "Male", total_members: 1, cso_id: 123, project_id: 17, remarks: nil, status_id: 4, created_at: "2011-11-07 09:39:24", updated_at: "2011-11-07 09:55:07">
irb(main):018:0> me.beneficiaryloans.collect {|h|User.find(h.hfi_id).firstname,h.hfi_id]}
=> [["Gruh", 117]]
using irb console I'm getting correct result
=> [["Gruh", 117]]
but when I put it in .html.erb file, It's giving argument error. How to solve this?
Look at this. select method has 3 obligatory parameters and you provide only two..