问题
I'm still having trouble searching for technologies that are stored in a separate table, where there is a relationship between the technology table (technol) and Project table through a table called projecttechnol.
This is my log when I try to search for a project with a technology (tech1).
Parameters: {"utf8"=>"✓", "client"=>"", "industry"=>"", "role"=>"", "technols"=>{"id"=>["", "1", ""]}, "business_div"=>"", "project_owner"=>"", "start_date_dd"=>"", "start_date_A"=>"", "start_date_B"=>"", "status"=>"", "keywords"=>"", "per_page"=>"10"}
User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
Technol Load (0.3ms) SELECT "technols".* FROM "technols"
Project Load (0.5ms) SELECT "projects".* FROM "projects" ORDER BY client
Project Load (0.6ms) SELECT "projects".* FROM "projects" ORDER BY industry
Project Load (0.4ms) SELECT "projects".* FROM "projects" ORDER BY role
Project Load (0.4ms) SELECT "projects".* FROM "projects" ORDER BY tech
CACHE (0.0ms) SELECT "projects".* FROM "projects" ORDER BY tech
CACHE (0.0ms) SELECT "projects".* FROM "projects" ORDER BY tech
CACHE (0.0ms) SELECT "projects".* FROM "projects" ORDER BY tech
CACHE (0.0ms) SELECT "projects".* FROM "projects" ORDER BY tech
CACHE (0.0ms) SELECT "projects".* FROM "projects" ORDER BY tech
Project Load (0.6ms) SELECT "projects".* FROM "projects" ORDER BY business_div
Project Load (0.5ms) SELECT "projects".* FROM "projects" ORDER BY project_owner
Project Load (0.7ms) SELECT "projects".* FROM "projects" ORDER BY status
(0.9ms) SELECT COUNT(*) FROM "projects" INNER JOIN "projecttechnols" ON "projecttechnols"."project_id" = "projects"."id" INNER JOIN "technols" ON "technols"."id" = "projecttechnols"."technol_id" WHERE "technols"."id" IS NULL
Here is my project.rb:
class Project < ActiveRecord::Base
attr_accessible :edited_first_name, :edited_last_name, :first_name, :last_name, :business_div, :client, :customer_benifits, :edited_date, :end_date, :entry_date, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary, :tech_id
validates_presence_of :business_div, :client, :customer_benifits, :end_date, :financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner, :role, :start_date, :status, :summary#, :tech
has_many :projecttechnols
has_many :technols, :through => :projecttechnols
def self.like(text); "%#{text}%"; end
def self.search(search_client, search_industry, search_role, search_tech_id, search_business_div, search_project_owner, search_status, search_start_date_dd, search_start_date_A, search_start_date_B, search_keywords)
# start with a scoped query, to apply more scopes on it afterwards
_projects = Project.scoped
# then, for each of the parameters, apply the scope only if present
if search_client.present?
_projects = _projects.where ['client LIKE ?', like(search_client)]
end
if search_industry.present?
_projects = _projects.where ['industry LIKE ?', like(search_industry)]
end
if search_role.present?
_projects = _projects.where ['role LIKE ?', like(search_role)]
end
_projects = _projects.joins(:technols).
where("technols.id" => search_techs_ids)
if search_business_div.present?
_projects = _projects.where ['business_div LIKE ?', like(search_business_div)]
end
if search_project_owner.present?
_projects = _projects.where ['project_owner LIKE ?', like(search_project_owner)]
end
if search_status.present?
_projects = _projects.where ['status LIKE ?', like(search_status)]
end
todays_date = DateTime.now.to_date
if !search_start_date_A.blank? or !search_start_date_B.blank?
search_start_date_A = Date.parse(search_start_date_A).strftime("%Y-%m-%d")
search_start_date_B = Date.parse(search_start_date_B).strftime("%Y-%m-%d")
todays_date = nil
search_start_date_dd = nil
end
if search_start_date_dd.blank?
todays_date = nil
end
if search_start_date_A.present? or search_start_date_B.present?
_projects = _projects.where [' DATE(start_date) BETWEEN ? AND ?', search_start_date_A, search_start_date_B]
end
if search_start_date_dd.present?
_projects = _projects.where ['DATE(start_date) BETWEEN ? AND ?', search_start_date_dd, todays_date]
end
if search_keywords.present?
_projects = _projects.where ['keywords LIKE ?', like(search_keywords)]
end
# now you have applied only the present scopes. return the result, and watch
# the query as it executes.
_projects
end
def self.paginated_for_index(projects_per_page, current_page)
paginate(:per_page => projects_per_page, :page => current_page)
end
end
Technol.rb:
class Technol < ActiveRecord::Base
attr_accessible :tech
has_many :projecttechnols
has_many :projects, :through => :projecttechnols
end
Projecttechnol.rb
class Projecttechnol < ActiveRecord::Base
attr_accessible :project_id, :technol_id
belongs_to :technol
belongs_to :project
end
Can anyone see a solution to this work properly. I am new to rails, so please remember this when attempting to help me. Searching for anything in the technology field returns nothing. Thanks a lot
回答1:
It looks like you've got a typo here in your search parameters:
def self.search(search_client, search_industry, search_role, search_tech_id...
But yet you use search_techs_id here:
_projects = _projects.joins(:technols).where("technols.id" => search_techs_ids)
If you examine your queries you can see that its trying to join the two tables with a NULL.
On another note, your search query is a bit long and tough to read, may I suggest using something like this:
class Project < ActiveRecord::Base
attr_accessible :edited_first_name, :edited_last_name, :first_name, :last_name,
:business_div, :client, :customer_benifits, :edited_date, :end_date, :entry_date,
:financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner,
:role, :start_date, :status, :summary, :tech_id
validates_presence_of :business_div, :client, :customer_benifits, :end_date,
:financials, :industry, :keywords, :lessons_learned, :project_name, :project_owner,
:role, :start_date, :status, :summary#, :tech
has_many :projecttechnols
has_many :technols, :through => :projecttechnols
scope :client, { |client| where ['client LIKE ?', like(client) ] }
scope :industry, { |industry| where ['industry LIKE ?', like(industry)] }
scope :role, { |role| where ['role LIKE ?', like(search_role)] }
scope :technologies, { |technology_ids| joins(:technols).where("technols.id}" => technology_ids) }
scope :division, { |division| where ['business_div LIKE ?', like(search_business_div)] }
scope :owner, { |owner| where ['project_owner LIKE ?', like(search_project_owner)] }
scope :status, { |status| where ['status LIKE ?', like(search_status)] }
scope :keywords, { |keywords| where ['keywords LIKE ?', like(keywords)] }
scope :started_before, { |date| where ['start_date <= ?',date] }
scope :started_after, { |date| where ['start_date >= ?',date] }
def self.search_fields
[:client,:industry,:role,:technologies,:division,:owner,:status,:started_before,:started_after,:keywords]
end
def self.search(params)
search_fields.inject(scoped) do |scopes,key|
params[key].present? ? scopes.send(key,params[key]) : scopes
end
end
def self.like(text); "%#{text}%"; end
def self.paginated_for_index(projects_per_page, current_page)
paginate(:per_page => projects_per_page, :page => current_page)
end
end
This way, your search method is quite a bit shorter, and since you've broken out all these parameters into their own scopes, if you need to reuse them, method is already there.
Hope this helps.
回答2:
I suppose that in the controller you get the correct value from the form.
This is your params:
{"utf8"=>"✓", "client"=>"", "industry"=>"", "role"=>"", "technols"=>{"id"=>["", "1", ""]}, "business_div"=>"", "project_owner"=>"", "start_date_dd"=>"", "start_date_A"=>"", "start_date_B"=>"", "status"=>"", "keywords"=>"", "per_page"=>"10"}
so the list of selected technols id is params["technols"]["id"] that is ["", "1", ""]. If this is intended, then you have to remove blanks for it
tech_ids = params["technols"]["id"].reject(&:blank?) # removes empty strings
and pass it in the search function. If it's not what intended, then check the code you use to create the select box, because it must return the correct IDs
来源：https://stackoverflow.com/questions/12693229/ruby-on-rails-table-relationship-search