Handling escape sequence in query params in rails app server with Postgres
0
query_string = params[:q]
model.where("name ILIKE ? ", "#{query_string}").limit(10)
In the controller I have the above lines
params[:q] is the user input.
Whenever the user input ends with , say police , Postgres throws this error:
ActionView::Template::Error (PG::InvalidEscapeSequence: ERROR: LIKE pattern must not end with escape character.
How can we gracefully handle such cases?
ruby-on-rails postgresql sql-like
asked Nov 13 '18 at 6:44
SuryaSurya
327111
add a comment |
0
query_string = params[:q]
model.where("name ILIKE ? ", "#{query_string}").limit(10)
In the controller I have the above lines
params[:q] is the user input.
Whenever the user input ends with , say police , Postgres throws this error:
ActionView::Template::Error (PG::InvalidEscapeSequence: ERROR: LIKE pattern must not end with escape character.
How can we gracefully handle such cases?
ruby-on-rails postgresql sql-like
asked Nov 13 '18 at 6:44
SuryaSurya
327111
add a comment |
0
0
0
query_string = params[:q]
model.where("name ILIKE ? ", "#{query_string}").limit(10)
In the controller I have the above lines
params[:q] is the user input.
Whenever the user input ends with , say police , Postgres throws this error:
ActionView::Template::Error (PG::InvalidEscapeSequence: ERROR: LIKE pattern must not end with escape character.
How can we gracefully handle such cases?
ruby-on-rails postgresql sql-like
asked Nov 13 '18 at 6:44
SuryaSurya
327111
query_string = params[:q]
model.where("name ILIKE ? ", "#{query_string}").limit(10)
In the controller I have the above lines
params[:q] is the user input.
Whenever the user input ends with , say police , Postgres throws this error:
ActionView::Template::Error (PG::InvalidEscapeSequence: ERROR: LIKE pattern must not end with escape character.
How can we gracefully handle such cases?
ruby-on-rails postgresql sql-like
ruby-on-rails postgresql sql-like
asked Nov 13 '18 at 6:44
SuryaSurya
327111
asked Nov 13 '18 at 6:44
SuryaSurya
327111
edited Nov 13 '18 at 7:04
Surya
asked Nov 13 '18 at 6:44
SuryaSurya
327111
asked Nov 13 '18 at 6:44
SuryaSurya
327111
asked Nov 13 '18 at 6:44
SuryaSurya
327111
327111
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
Use a different escape character, for example:
WHERE name ILIKE 'pattern' ESCAPE '/'
If you have no safe escape character, you can double it:
WHERE nane ILIKE replace('pattern', '', '\')
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
|
show 2 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Use a different escape character, for example:
WHERE name ILIKE 'pattern' ESCAPE '/'
If you have no safe escape character, you can double it:
WHERE nane ILIKE replace('pattern', '', '\')
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
|
show 2 more comments
1
Use a different escape character, for example:
WHERE name ILIKE 'pattern' ESCAPE '/'
If you have no safe escape character, you can double it:
WHERE nane ILIKE replace('pattern', '', '\')
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
|
show 2 more comments
1
1
1
Use a different escape character, for example:
WHERE name ILIKE 'pattern' ESCAPE '/'
If you have no safe escape character, you can double it:
WHERE nane ILIKE replace('pattern', '', '\')
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
Use a different escape character, for example:
WHERE name ILIKE 'pattern' ESCAPE '/'
If you have no safe escape character, you can double it:
WHERE nane ILIKE replace('pattern', '', '\')
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
edited Nov 13 '18 at 7:06
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
answered Nov 13 '18 at 6:55
Laurenz AlbeLaurenz Albe
45k102747
45k102747
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
|
show 2 more comments
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
Nope then if the user enters 'Police /' I will be getting the same error right? params[:q] is a user input.
– Surya
Nov 13 '18 at 6:59
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
how can gracefully handle all such cases?
– Surya
Nov 13 '18 at 7:01
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
Double the escape character as indicated in the extended answer.
– Laurenz Albe
Nov 13 '18 at 7:07
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
if I use replace then in valid cases like 'police a ' it will get queried as 'police \a' isn't it? Isn't that not desirable?? But chances that I get input like 'police a ' is minimal so I might as well use this, but still wondering..
– Surya
Nov 13 '18 at 7:14
1
1
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
Well, if the backslash sometimes is an escape character and sometimes not, you need to have additional information. There is no way to guess which is meant.
– Laurenz Albe
Nov 13 '18 at 7:17
|
show 2 more comments
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